{"id":13190,"date":"2020-08-21T12:43:57","date_gmt":"2020-08-21T19:43:57","guid":{"rendered":"https:\/\/careerkarma.com\/blog\/?p=13190"},"modified":"2023-12-01T03:58:07","modified_gmt":"2023-12-01T11:58:07","slug":"python-isalpha-isnumeric-isalnum","status":"publish","type":"post","link":"https:\/\/careerkarma.com\/blog\/python-isalpha-isnumeric-isalnum\/","title":{"rendered":"Python isalpha, isnumeric, and isAlnum: A Guide"},"content":{"rendered":"\n

The Python <\/em>isalpha()<\/em><\/code> method returns true if a string only contains letters. Python <\/em>isnumeric()<\/em><\/code> returns true if all characters in a string are numbers. Python <\/em>isalnum()<\/em><\/code> only returns true if a string contains alphanumeric characters, without symbols. <\/em><\/p>\n\n\n\n

\n\n\n\n

When you\u2019re working with strings in Python, there may be times when you want to check whether those strings contain only letters, only numbers, or only any alphanumeric characters. For instance, a program that asks a user to insert a username may want to verify that there are no special characters in the username a user chooses.<\/p>\n\n\n\n

That\u2019s where Python\u2019s isalpha()<\/code>, isnumeric()<\/code>, and isalnum()<\/code> string methods come in. You can use these methods to check the contents of a string against certain criteria.<\/p>\n\n\n\n

This tutorial will explore how to use Python\u2019s built-in isalpha()<\/code>, isnumeric()<\/code>, and isalnum()<\/code> functions to determine whether a string contains only letters, only numbers, or only letters and numbers, respectively. We\u2019ll also explore an example of each of these methods in Python programs.<\/p>\n\n\n\n

Python isalpha<\/h2>\n\n\n\n

The Python isalpha()<\/code> string method is used to check whether a string consists of only alphabetical characters. In other words, isalpha()<\/code> checks if a string contains only letters.<\/p>\n\n\n\n

The Python isalpha()<\/code> method returns the Boolean<\/a> value True<\/code> if every character in a string is a letter; otherwise, it returns the Boolean value False<\/code>. In Python, a space is not an alphabetical character, so if a string contains a space, the method will return False<\/code>. <\/p>\n\n\n\n

The syntax for isalpha()<\/code> is as follows:<\/p>\n\n\n\n

string_name.isalpha()<\/pre><\/div>\n\n\n\n
As you can see, isalpha()<\/code> does not take in any parameters. Instead, the method is appended to the end of a string value or a variable containing a string.<\/p>\n\n\n\n
Let\u2019s walk through an example to demonstrate how this method works.<\/p>\n\n\n\n
Let\u2019s say that we are building a registration form for a scheduling app. In order to sign up, prospective users must submit their first name, surname, email address, and a password. When someone inserts a first and second name, we want to check to make sure those names only include letters so that our program can process them correctly.<\/p>\n\n\n\n
We can use the isalpha()<\/code> method to verify that the name a user submits only includes letters. Here\u2019s an example of a program that would perform this function:<\/p>\n\n\n\n
first_name = input("What is your first name?")\nsecond_name = input("What is your second name?")\n\nprint(first_name.isalpha())\nprint(second_name.isalpha())<\/pre><\/div>\n\n\n\n
When we run our code and insert the value John<\/code> as our first name and 8<\/code> as our second name, our program returns the following response: <\/p>\n\n\n\n
What is your first name?\nJohn\nWhat is your second name?\n8\n\nTrue\nFalse<\/pre><\/div>\n\n\n\n
Let\u2019s break down our code. On the first two lines, we use the Python input() method<\/a> to collect a user\u2019s first and second names. Then, we use the isalpha()<\/code> method to check whether these names only contain alphabetical characters. When our program evaluates first_name.isalpha()<\/code>, it returns True<\/code> because the value our program stored as first_name<\/code> contains only letters. <\/p>\n\n\n\n
However, when our program evaluates the second name, it returns False<\/code> because our user inserted a number as their second name.<\/p>\n\n\n\n
Python isnumeric<\/h2>\n\n\n\n
The Python isnumeric()<\/code> method checks whether all the characters in a string are numbers. If each character is a number, isnumeric()<\/code> returns the value True<\/code>. Otherwise, the method returns the value False<\/code>.<\/p>\n\n\n\n
The syntax for the Python isnumeric()<\/code> method is as follows:<\/p>\n\n\n\n
string_name.isnumeric()<\/pre><\/div>\n\n\n\n
Similar to the isalpha()<\/code> method, isnumeric()<\/code> does not accept any parameters. Instead, it is appended to the end of a string.<\/p>\n\n\n\n
Let\u2019s walk through an example to illustrate how to use isnumeric()<\/code>.<\/p>\n\n\n\n
Say that we are building a multiplication game for fourth graders. Our program generates math problems for the students and asks them to type an answer into our program. However, before we can check if a user\u2019s answer is correct, we need to check whether they inserted a number.<\/p>\n\n\n\n
Here\u2019s the code we could use to verify that a user inserted a numerical answer to the math problem they were given:<\/p>\n\n\n\n
student_answer = input("What is 9 x 10?")\n\nprint(student_answer.isnumeric())<\/pre><\/div>\n\n\n\n
When we run our code and type in a number, our program returns the following response: <\/p>\n\n\n\n
What is 9 x 10?\n90\nTrue<\/pre><\/div>\n\n\n\n
On the first line of our code, we use the input()<\/code> method to accept a student\u2019s answer to the math problem. Note that input()<\/code> always returns a string.<\/p>\n\n\n\n
On the next line of code, we use isnumeric()<\/code> to check whether the contents of the student\u2019s answer are all numbers. In this case, the student entered 90<\/code>, which is all numbers, so our program returns True<\/code>.<\/p>\n\n\n\n
Python isalnum<\/h2>\n\n\n\n
Often, you\u2019ll want to check whether strings contain only alphanumeric characters\u2014in other words, letters and numbers. That\u2019s where isalnum()<\/code> can be helpful.<\/p>\n\n\n\n
isalnum()<\/code> is a built-in Python function that checks whether all characters in a string are alphanumeric. In other words, isalnum()<\/code> checks whether a string contains only letters or numbers or both. If all characters are alphanumeric, isalnum()<\/code> returns the value True<\/code>; otherwise, the method returns the value False<\/code>.<\/p>\n\n\n\n
The syntax for the isalnum()<\/code> function is as follows:<\/p>\n\n\n\n
string_name.isalnum()<\/pre><\/div>\n\n\n\n
Like the isalpha()<\/code> and isnumeric()<\/code> methods, isalnum()<\/code> does not accept any parameters.<\/p>\n\n\n\n
Say that we are building a registration form for a game that asks users to choose a username. We want to require that usernames contain only letters and numbers. If a user chooses a username that includes other characters, our program should present a message telling them that their username is invalid.<\/p>\n\n\n\n
We could use the following code to accomplish this goal:<\/p>\n\n\n\n
username = input("Choose a username:")\n\nif username.isalnum() == True:\n\tprint("Your new username is ", username)\nelse:\n\tprint("This username is invalid.")<\/pre><\/div>\n\n\n\n
When we run our code and insert the username user123<\/code> into our program, our program returns the following: <\/p>\n\n\n\n
Choose a username:\nuser123\nYour new username is user123<\/pre><\/div>\n\n\n\n
If we were to insert the username user123!<\/code>, which includes a non-alphanumeric character, our program would return the following:<\/p>\n\n\n\n
Choose a username:\nuser123!\nThis username is invalid.<\/pre><\/div>\n\n\n\n
When we enter the username user123<\/code>, the isalnum()<\/code> method evaluates to True<\/code>, because the string only includes letters and numbers. So, the contents of our if<\/code> loop are executed, and the message Your new username is user123<\/code> is printed to the console. But when we include a non-alphanumeric character in the username, the isalnum()<\/code> method evaluates to False<\/code>, and our program prints This username is invalid.<\/code> to the console.<\/p>\n\n\n\n
Conclusion<\/h2>\n\n\n\n
When you\u2019re working with strings, you may want to evaluate whether they contain only letters, only numbers, or only any alphanumeric characters. That\u2019s where the isalpha()<\/code>, isnumeric()<\/code>, and isalnum()<\/code> methods come in, respectively.<\/p>\n\n\n\n
Here\u2019s a quick summary of all three:<\/p>\n\n\n\n
isalpha<\/code> Python is a string method that returns true or false, checking whether a string consists of only alphabetical characters.<\/p>\n\n\n\n
isnumeric<\/code> Python is a string method that checks whether a string consists of only numeric characters and returns true or false.<\/p>\n\n\n\n
isalnum Python is a string method that checks whether a string consists of only letters and numbers, without special characters or punctuation, and returns true or false.
<\/p>\n\n\n\n
Now you\u2019re ready to start using isalpha()<\/code>, isnumeric()<\/code>, and isalnum()<\/code> like a Python pro!<\/p>\n","protected":false},"excerpt":{"rendered":"The Python isalpha() method returns true if a string only contains letters. Python isnumeric() returns true if all characters in a string are numbers. Python isalnum() only returns true if a string contains alphanumeric characters, without symbols. When you\u2019re working with strings in Python, there may be times when you want to check whether those…","protected":false},"author":240,"featured_media":13191,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[16578],"tags":[],"class_list":{"0":"post-13190","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-python"},"acf":{"post_sub_title":"","sprint_id":"","query_class":"Python","school_sft":"","parent_sft":"","school_privacy_policy":"","has_review":null,"is_sponser_post":"","is_guest_post":""},"yoast_head":"\nPython isalpha, isnumeric, and isAlnum: A Guide | Career Karma<\/title>\n<meta name=\"description\" content=\"You can use Python\u2019s isalpha, isnumeric, and isalnum methods to check what's in a string. 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