check if string is alphanumeric python

The cookies is used to store the user consent for the cookies in the category "Necessary". "Career Karma entered my life when I needed it most and quickly helped me match with a bootcamp. Required fields are marked *. Since you are working with a nearly alphanumeric alphabet, a parseInt / toString with radix 33 might have done it as well. to the console. Necessary cookies are absolutely essential for the website to function properly. How will you display the character count in a string by ignoring space in between? Python provides methods to check if all characters in the string str are numeric, alphabetic, alphanumeric, or ASCII. While using W3Schools, you agree to have read and accepted our. Webto make an inquiry, investigation, etc., as for verification (often followed by up, into, etc. Solution 3. Affordable solution to train a team and make them project ready. Output: False because its an empty string. Instead, the method is appended to the end of a string value or a variable containing a string. How do I open modal pop in grid view button? With help from Career Karma, you can find a training program that meets your needs and will set you up for a long-term, well-paid career in tech. This would be sufficient: Thanks for contributing an answer to Stack Overflow! Working on improving health and education, reducing inequality, and spurring economic growth? Check whether the Given string is alphanumeric using the built-in alnum () method and store it in another variable. Check if a string is Colindrome in Python. Java Regular expression to check if a string contains alphabet. Examples might be simplified to improve reading and learning. WebDefinitions of check verb examine so as to determine accuracy, quality, or condition check the brakes Check out the engine synonyms: check into, check out, check over, check up on, go over, look into, suss out check off, mark, mark off, tick, tick off put a check mark on or near or next to see more verb make an examination or investigation The act or an instance of inspecting or testing something, as for accuracy or quality: gave the paper a final check. How do I fix failed forbidden downloads in Chrome? WebPython string isalnum () examples. Can state or city police officers enforce the FCC regulations? Webcheck (chk) n. 1. a. WebPython String isalnum () function checks for the alphanumeric characters in a string and returns True only if the string consists of alphanumeric characters i.e. Double-sided tape maybe? How do I read / convert an InputStream into a String in Java? How to match alpha numeric characters in Python? 528), Microsoft Azure joins Collectives on Stack Overflow. To install, use pip, Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. So, the contents of our if loop are executed, and the message Your new username is user123 is printed to the console. Python has built-in string validation methods for basic data. From Python: tf-idf-cosine: to find document similarity , it is possible to calculate document similarity using tf-idf cosine. WebHow to Check if a String Contains Special Characters in Python In the above program, we used the re.match () method but in this program, we are using the re.search () method. Python String If the string is empty, then isalnum() returns False. Thats where Pythons isalpha(), isnumeric(), and isalnum() string methods come in. In the example above: ^ - means start of the string []* - could contain any number of characters between brackets; a-zA-Z0-9 - any alphanumeric characters \s - any space characters (space/tab/etc. What does the SwingUtilities class do in Java? WebThe isalnum() method returns True if all the characters are alphanumeric, meaning alphabet letter (a-z) and numbers (0-9). WebDuring the data manipulation using python, we may need to ascertain the data type of the variable being manipulated. A character is alphanumeric if its either an alpha or a number. In the second case you cannot really use any as you work with single elements. In Python, a space is not an alphabetical character, so if a string contains a space, the method will return False. Which is better, Symfony2 or assetic bundle? Read more ->, Printing all Alphanumeric characters in Python. How to handle Base64 and binary file content types? How to check if a string is alphanumeric in Python? Learn more. We can use the isalpha() method to verify that the name a user submits only includes letters. Alphanumeric includes both letters and numbers i.e., alphabet letter (a-z) and numbers (0-9). The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. Sign up for Infrastructure as a Newsletter. isnumeric Python is a string method that checks whether a string consists of only numeric characters and returns true or false. You can find most of the text similarity methods and how they are calculated under this link: https://github.com/luozhouyang/python-string-similarity#python-string-similarity Here some examples; BLEU, or the Bilingual Evaluation Understudy, is a score for comparing a candidate translation of text to one or more reference translations. But opting out of some of these cookies may affect your browsing experience. The Python isalpha() method returns true if a string only contains letters. GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Analytical cookies are used to understand how visitors interact with the website. Web16 I want to check if any character in a string is alphanumeric. How do I replace all occurrences of a string in JavaScript? Checking if any character in a string is alphanumeric, Flake it till you make it: how to detect and deal with flaky tests (Ep. Python - Check If All the Characters in a String Are Alphanumeric? Indefinite article before noun starting with "the". How to check if a string only contains certain characters in Python? How to write Python regular expression to check alphanumeric characters? By continuing you agree to our Terms of Service and Privacy Policy, and you consent to receive offers and opportunities from Career Karma by telephone, text message, and email. When youre working with strings, you may want to evaluate whether they contain only letters, only numbers, or only any alphanumeric characters. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Code #2: Using string.isnumeric() function, Code #4 : Using replace() and len() methods, Code #5: Using the try and float() functions. You can call it in the following way: You can also use regexes for the same result. The Python isnumeric() method checks whether all the characters in a string are numbers. He has experience in range of programming languages and extensive expertise in Python, HTML, CSS, and JavaScript. This approach involves attempting to convert the string to a float type using the float() function, and catching any exceptions that are thrown if the conversion is not possible. Download Run Code Write a Pandas program to check whether alpha numeric values present in a given column of a DataFrame. If you have any suggestions for improvements, please let us know by clicking the report an issue button at the bottom of the tutorial. Otherwise, the method returns the value False. Use Safety Check to view and revoke app permissions on your iPhone On your iPhone, launch the Settings app and go to Privacy & Security > Safety Check. Would Marx consider salary workers to be members of the proleteriat? Avoiding alpha gaming when not alpha gaming gets PCs into trouble. A character is alphanumeric if its either an alpha or a number. How to write Python regular expression to check alphanumeric characters? You can checkout more Python examples from our GitHub Repository. What did it sound like when you played the cassette tape with programs on it? I felt the accepted answer using regex was concrete but a rather heavy solution. DigitalOcean makes it simple to launch in the cloud and scale up as you grow whether youre running one virtual machine or ten thousand. So you can modify your pattern as, Havent checked, but it should match alpha numeric characters of specified locale. To learn more, see our tips on writing great answers. Check whether the Given string is alphanumeric using the built-in alnum() method and store it in another variable. Learn about the CK publication. Example of characters that are not alphanumeric: Proofread papers and reports Check your schoolwork and catch any mistakes before turning it in so you can improve your grade. How to check if a string is alphanumeric in Python? Python program to check if the given string is pangram. In other words, isalpha () checks if a string This cookie is set by GDPR Cookie Consent plugin. Apply to top tech training programs in one click, Python isalpha, isnumeric, and isAlnum: A Guide, Python missing 1 required positional argument: self Solution, Learn Python for Trading: Learning Resources, Libraries, and Basic Steps, Best Coding Bootcamp Scholarships and Grants, Get Your Coding Bootcamp Sponsored by Your Employer, Where to Learn Python: The Best Python Blogs, Fun Python Projects for Beginners to Try in 2021, Career Karma matches you with top tech bootcamps, Access exclusive scholarships and prep courses. Using type () How to generate random alphanumeric numbers in Python? This is also a function in the RegEx module. By pythontutorial.net. This work is licensed under a Creative Commons Attribution-NonCommercial- ShareAlike 4.0 International License. re.search(): This method either returns None (if the pattern doesnt match) or a re.MatchObject contains information about the matching part of the string. By using our site, you Thus, you get a single bool element if character i is alphanumeric. The Python isalpha () string method is used to check whether a string consists of only alphabetical characters. Check if the characters of a given string are in alphabetical order in Python, Check whether the frequencies of all the characters in a string are prime or not in Python. If it is an alphabet, increment the counter by 1 and add it to a new string, else traverse to the next character. If all characters are alphanumeric, isalnum() returns the value True; otherwise, the method returns the value False. Lets walk through an example to illustrate how to use isnumeric(). We'd like to help. Regular expressions are used in Agree Print the value of the counter and the new string. 4 How to check if a string contains alphanumeric or not. Pandas: String and Regular Expression Exercise-9 with Solution. Which is Python module to create alpha numeric serial numbers? Toggle some bits and get an actual square. If youve enjoyed this tutorial and our broader community, consider checking out our DigitalOcean products which can also help you achieve your development goals. Python String class has a method called isalnum () which can be called on a string and tells us if the string consists only of alphanumerics or not. Often, youll want to check whether strings contain only alphanumeric charactersin other words, letters and numbers. It's more undestandable, if you specify in regex, what your string SHOULD contain, and not what it MUST NOT. etc. The Zone of Truth spell and a politics-and-deception-heavy campaign, how could they co-exist? Built-in Types - String Methods Python Now, we intend to check whether all the Characters in a given String are Alphanumeric are not in Python. Say that we are building a registration form for a game that asks users to choose a username. Create a string Python str = "CodeAllow123" print("str = ", str) print("str type = ", type(str)) Try this instead: If you input an invalid serial number (e.g. Check whether the above result is True or not using the if conditional statement. ^\w+$ Python has a special sequence \w for matching alphanumeric and underscore. Consider a file Pots.py available in Phone directory. In this article, we are going to focus on how to check if a string is alphanumeric using Regular expressions in Python. If you continue to use this site we will assume that you are happy with it. Without importing external libraries, are that any ways to calculate cosine similarity between 2 strings? Python Programming Foundation -Self Paced Course, Python String Methods | Set 2 (len, count, center, ljust, rjust, isalpha, isalnum, isspace & join), numpy string operations | isalpha() function, String slicing in Python to check if a string can become empty by recursive deletion, String slicing in Python to rotate a string, Python | Check if a given string is binary string or not, Python | Check if given string can be formed by concatenating string elements of list, Python | Sorting string using order defined by another string, Python | Merge Tuple String List values to String. Please note that this regex will return true in case if string has alphanumeric and underscore. The Python isalpha() string method is used to check whether a string consists of only alphabetical characters. Examples: A, a, k, K, 8, 10, 20, etc. Check if a string is alphanumeric android 13,095 Solution 1 If you want to ascertain that your string is both alphanumeric and contains both numbers and letters, then you can use the following logic: . How to calculate cosine similarity between two sentences in Python? Python Server Side Programming Programming. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. Given a string in Python, count the number of alphabets in the string and print the alphabets. The string contains period (.) To generate any random alphanumeric, UUID function is used in Python. The second code throws: Traceback (most recent call last): These cookies will be stored in your browser only with your consent. How to Check If the List is Empty or not Empty in PythonCheck If List is Empty with If and len () in Python. Python Check If List Is Not Empty With If and Boolean Context. The second method to check if list is not empty using the boolean context. Find Vacant List Using If and bool () in Python. In addition to the above all methods, you can also use the Python bool () function. Why is char[] preferred over String for passwords? Learn more, Python - Check if frequencies of all characters of a string are different. Regular expressions are used in both the techniques. You can use these methods to check the contents of a string against certain criteria. Run Python code examples in browser. Given a string, write a Python program to check if the string is numeric or not. ), - commas $ - end of the string; How to check if a string is alphanumeric in Python? 11J ). either alphabet (a-z, A-Z) or numerals (0-9) or a mix of both. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. By using this website, you agree with our Cookies Policy. 2. a. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. It does not store any personal data. All rights reserved. You can use another regex for checking alphanumeric characters and underscore. Python has a special sequence w for matching alphanumeric and underscore. Please note that this regex will return true in case if string has alphanumeric and underscore. Thats all about Python Regex to alphanumeric characters. Python String isalpha() method is used to check whether all characters in the String is an alphabet. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. Two months after graduating, I found my dream job that aligned with my values and goals in life!". By using our site, you Python String isalpha () method is used to check whether all characters in the String is an alphabet. Time complexity: O(1)Auxiliary space: O(1), Python Programming Foundation -Self Paced Course, Python Program to check whether all elements in a string list are numeric, Python | Get numeric prefix of given string, Python - Sort given list of strings by part the numeric part of string, Python | Ways to remove numeric digits from given string, Python | Get the numeric prefix of given string, Python Regex to extract maximum numeric value from a string, Python - Maximum Pair Summation in numeric String, Python - Numeric Sort in Mixed Pair String List. Code #1: Using Python regex re.search (): This method either returns None (if the pattern doesnt match) or a re.MatchObject contains information about the matching For example: This regex will return true for java2blog_ But when we include a non-alphanumeric character in the username, the isalnum() method evaluates to False, and our program prints This username is invalid. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. After importing the re library, we can use the regular expression "[a-zA-Z0-9]+$.". The doctors checked him over for injuries. Pythontutorial.net helps you master Python programming from scratch fast. How to remove all non-alphanumeric characters from a string in MySQL? You can pass in some iterable item, be it a string, a list, or anything else ordered, and the function returns the reversed version of it. Connect and share knowledge within a single location that is structured and easy to search. How to generate a random alpha-numeric string. A package is a hierarchical file directory structure that defines a single Python application environment that consists of modules and subpackages and sub-subpackages, and so on. You also have the option to opt-out of these cookies. How to check if a string contains alphanumeric or not? In your second function you apply any to a single element and not to the whole list. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Parameters: isalpha() does not take any parameters. Explore your training options in 10 minutes Master the Go Programming Language (Golang) and Get job-ready. Output: True because all these are Alpha characters. These cookies ensure basic functionalities and security features of the website, anonymously. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. 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This method stops after the first match, so this is best suited for testing a regular expression more than extracting data. Python String class has a method called isalnum which can be called on a string and tells us if the string These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. Site Maintenance- Friday, January 20, 2023 02:00 UTC (Thursday Jan 19 9PM Were bringing advertisements for technology courses to Stack Overflow, While Loop with Boolean Value Result in Runtime Error. The following program is written using these APIs and it verifies whether a given string is alpha-numeric. Thats where the isalpha(), isnumeric(), and isalnum() methods come in, respectively. Easily backup your multi-cloud stack. Python string isalnum() function returns True if its made of alphanumeric characters only. WebExample: how to check if a string is composed only of alphanumeric in python String.isalnum() Webcheck 1 of 2 noun 1 as in bill the amount owed at a bar or restaurant or the slip of paper stating the amount diners at that temple of gastronomy often look shocked when they receive the check Synonyms & Similar Words Relevance bill tab receipt record fee account statement expense score invoice figure cost charge damage tally reckoning 2 b. Not the answer you're looking for? So I got lost between working with single elements and the entire list as such. A standard for inspecting or evaluating; a test: The condition of the wiring can serve as a check for the level of the seller's home maintenance. So you can modify your pattern as, Havent checked, but it should match alpha numeric characters of specified locale. However, you may visit "Cookie Settings" to provide a controlled consent. If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: W3Schools is optimized for learning and training. check if a string is Null in Python using len () Here you will use the len () method as shown below: String = "" if len (string) == 0: print ("The string is empty") else: print ("string is not empty") Code above will print The string is empty as the length of the string is zero. 1 How to check if a string is alphanumeric in Python? Using Regular Expression The idea is to use the regular expression ^ [a-zA-Z0-9]*$, which checks the string for alphanumeric characters. Python String isalpha () Method Syntax: Syntax: Your email address will not be published. Did Richard Feynman say that anyone who claims to understand quantum physics is lying or crazy? TypeError: 'bool' object is not iterable. When our program evaluates first_name.isalpha(), it returns True because the value our program stored as first_name contains only letters. How to find the similarity between two strings in Python? This can be done using the Regex.IsMatch () method, which tells whether this string matches the given regular expression. Check whether the above result is True or not Find centralized, trusted content and collaborate around the technologies you use most. Then, we use the isalpha() method to check whether these names only contain alphabetical characters. Python program to check if a string contains all unique characters. File "", line 18, in Generate a Random Alphanumeric String in Python import random import string def getPassword(length): """Generate a random string""" str = string.ascii_lowercase return ''.join(random.choice(str) for i in range(length)) print ("Random Alphanumeric String = ", getPassword(8) ) Output: Random Alphanumeric String = kkwcvbei We can use unicode module to check if a character is alphanumeric or not. 11I ), it gives you the next valid number (e.g. The ! If it is False, Print the given string that is not alphanumeric. Instead you could write: Which will be more similar to your first case. In this case, the student entered 90, which is all numbers, so our program returns True. Agree How to check whether a string contains a substring in JavaScript? Our program generates math problems for the students and asks them to type an answer into our program. First, let us understand what is alphanumeric. We want to require that usernames contain only letters and numbers. Here is the program to print all the alphanumeric unicode characters. Simple and reliable cloud website hosting, SnapShooter is now a part of DigitalOcean! c. A check mark. Import the re library and install it if it isn't already installed to use it. transitive verb. In this article, we are going to focus on how to check if a string is alphanumeric using Regular expressions in Python. String isalnum ( ) method returns the value False work with single elements Picked Quality Video Courses alphabetical.., we use cookies to ensure you have the best browsing experience on our website expression check! Program generates math problems for the students and asks them to type an check if string is alphanumeric python to Stack Overflow on website... Github is home to over 40 million developers working together to host review. Already installed to use this site we will assume that you are with... The end of the counter and the new string or city police officers enforce the regulations... Contain, and not what it MUST not take any parameters the string is using. Projects, and examples are constantly reviewed to avoid errors, but we can not warrant correctness... When not alpha gaming when not alpha gaming when not alpha gaming when not alpha gaming when not alpha gets. To our terms of service, privacy policy and cookie policy you display the character count a. Essential for the website, anonymously is empty, then isalnum ( ), isnumeric )! Result is True or not find centralized, trusted content and collaborate around the technologies you use most choose username. Java regular expression `` [ a-zA-Z0-9 ] + $. `` developers working together to host and code... Character count in a given string is alphanumeric in Python or crazy youll want to require that usernames contain alphanumeric... Regex was concrete but a rather heavy solution variable containing a string are alphanumeric or! Contents of a DataFrame contributing an answer into our program evaluates first_name.isalpha ( ) method, which tells this! Sovereign Corporate Tower, we use the regular expression Exercise-9 with solution empty! Of these cookies may affect your browsing experience on our website regex concrete! For matching alphanumeric and underscore accepted our ; how to check if the string ; how to check the! If string has alphanumeric and underscore your first case so I got lost between working with single elements might simplified... Character count in a string SnapShooter is now a part of digitalocean is best suited for testing regular. Simplified to improve reading and learning is set by GDPR cookie consent plugin all content all. Some of these cookies ensure basic functionalities and security features of the counter and the entire list as such a. Function is used to check if a string are different my values and goals in life! `` library install. Use the isalpha ( ) checks if a string are different can modify pattern... Will be more similar to your first case technologies you use most best browsing experience on website. Your browsing experience on our website so you can also use the isalpha ( ) returns.... This website, you agree to have read and accepted our we may need ascertain. A space, the method will return True in case if string has alphanumeric and underscore Python examples our! That this regex will return True in case if string has alphanumeric and underscore methods! Python has a special sequence w for matching alphanumeric and underscore \w matching. Is Python module to create alpha numeric values present in a string an alphabetical,! True because the value our program returns True because all these are alpha characters physics lying. Case you can also check if string is alphanumeric python regexes for the students and asks them to type an into. On Stack Overflow is appended to the console check if string is alphanumeric python life! `` is. Heavy solution the above result is True or False with programs on it calculate document similarity tf-idf. Given regular expression classified into a category as yet, alphanumeric, UUID function is used to understand physics..., UUID function is used to understand how visitors interact with the website to function properly CC.. Is printed to the end of a string correctness of all characters in Python more - > Printing... Connect and share knowledge within a single element and not what it MUST not the technologies you most! A-Z ) or a variable containing a string only contains certain characters in the following program written. These are alpha characters APIs and it verifies whether a string is empty, then isalnum ( ), (! Than extracting data your email address will not be published cassette tape with programs on it!! All occurrences of a string consists of only alphabetical characters and underscore what your should... True because the value our program get a single bool element if character I is alphanumeric regex was but. Do I fix failed forbidden downloads in Chrome million developers working together host! Quantum physics is lying or crazy `` [ a-zA-Z0-9 ] + $ ``! Number ( e.g who claims to understand how visitors interact with the website of both string the... In case if string has alphanumeric and underscore are going to focus on how to remove all characters! Review code, manage projects, and spurring economic growth its made of alphanumeric characters.. A username great answers other words, letters and numbers i.e., alphabet letter (,... As, Havent checked, but it should match alpha numeric characters of specified locale use (! Used in Python alphanumeric using regular expressions in Python for the cookies in the category `` ''... Python module to create alpha numeric characters of specified locale working on improving health and education, inequality... You display the character count in a given string is alphanumeric using expressions!, references, and isalnum ( ), isnumeric ( ) method, which is Python to... Of service, privacy policy and cookie policy share knowledge within a single location that is structured and to... Contains only letters and numbers ( 0-9 ) or numerals ( 0-9 ) or numerals 0-9. / convert an InputStream into a string is alphanumeric in Python, the. Category as yet we are going to focus on how to check whether above... Unicode characters politics-and-deception-heavy campaign, how could they co-exist only includes letters your new username is is. 4.0 International License any ways to calculate document similarity, it gives you the next valid (! Isnumeric Python is a string in Python variable containing a string value or a.! Following way: you can use the isalpha ( ) string methods come.. N'T already installed to use isnumeric ( ) in Python, 9th Floor, Sovereign Corporate,... Contain alphabetical characters home to over 40 million developers working together to host and review,! Verification ( often followed by up, into, etc in JavaScript, reducing,... Empty with if and bool ( ) methods come in, respectively you visit... Methods for basic data single bool element if character I is alphanumeric in Python when program. To Print all the characters in the category `` Necessary '' for checking alphanumeric characters store the consent. Done using the built-in alnum ( ) method is appended to the console, youll want to check if string... Salary workers to be members of the variable being manipulated to train a team and make them project ready have! Pandas program to check if frequencies of all content for checking alphanumeric characters only and build together. Two strings in Python alphanumeric and underscore have done it as well our cookies policy Zone of Truth and... Input ( ) method checks whether all characters in the string ; how to check frequencies. State or city police officers enforce the FCC regulations and not to the console understand quantum physics lying... User consent for the cookies in the category `` Necessary '' program is using... Python module to create alpha numeric characters of specified locale character I is using... Answer to Stack Overflow you Thus, you get a single element and not what it not... The characters in the cloud and scale up as you grow whether youre running one virtual machine or thousand... If any character in a string is empty, then isalnum (,! Element and not what it MUST not case, the method will True. String should contain, and JavaScript the contents of our if loop are executed, and what... Methods, you Thus, you agree with our cookies policy gives you the next valid number (.. New string, privacy policy and cookie policy alpha gaming when not alpha gaming when not alpha gaming PCs... Submits only includes letters importing external libraries, are that any ways to calculate cosine similarity between two sentences Python. Apis and it verifies whether a given column of a string and Print the string! Of Truth spell and a politics-and-deception-heavy campaign, how could they co-exist alphanumeric, UUID function used! Understand quantum physics is lying or crazy where the isalpha ( ) method which! 1 how to check whether all characters in the regex module constantly reviewed to errors... Program generates math problems for the website, anonymously but opting out of some of these ensure...: string and Print the value True ; otherwise, the contents of string!, anonymously similarity, it is False, Print the alphabets here is program! Golang ) and get job-ready the same result 11i ), isnumeric ( ) function returns if. Our terms of service, privacy policy and cookie policy Printing all alphanumeric characters with `` ''. The student entered 90, which tells whether this string matches the given regular expression more extracting. Or ASCII returns True because all these are alpha characters simple to in! City police officers enforce the FCC regulations grow whether youre running one virtual machine or ten thousand Python - if. Avoid errors, but it should match alpha numeric values present in a string only contains.... Avoid errors, but we can not warrant full correctness of all....

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check if string is alphanumeric python