Python isalpha() method
In this post, you will learn about the isalpha() method of the Python programming language.
In most cases, there may be a need to check strings with alphabets only, like in name validation and so on. Python provides many built-in methods for string handling. The isalpha() method is one of them that returns true if all the characters in the string are alphabets. If not, it returns false. This function basically checks if the arguments include only alphabetic letters (both uppercase and lowercase).
Syntax of isalpha() method
This method does not take any parameter. An error occurs if a parameter is passed.
Return Value from the isalpha() method
The isalpha() method returns the following:
- True, if all characters in the string are alphabets.
- False, if at least one character is not alphabet.
The following example demonstrates the working of the isalpha() method.
Output of the above code:
name = "Priska" print(name.isalpha()) # contains whitespace name = "Priska Kashyap" print(name.isalpha()) # contains number name = "Priska234232Kasyap" print(name.isalpha())
True False False
As you can see in the above example, it returns true only for alphabetic strings. The space is also not considered alphabetic, that's why returns false.
Filter non alphabetic characters using isalpha
This method can also be used to filter non-alphabetic characters. In the given example, we have taken a string that contains non-alphabetic characters. We have looped over the string and filtered the string using the isalpha() method.
Output of the above code:
string='@Pri#22323ska3Kasy09ap' count=0 newstring="" for s in string: if (s.isalpha()) == True: count+=1 newstring+=s print(count) print(newstring)
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