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).

ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz

Syntax of isalpha() method

string.isalpha()

This method does not take any parameter. An error occurs if a parameter is passed.

The isalpha() method returns the following:

• True, if all characters in the string are alphabets.
• False, if at least one character is not alphabet.

Python isalpha()

The following example demonstrates the working of the isalpha() method.

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.

string='@Pri#22323ska3Kasy09ap'
count=0
newstring=""

for s in string: 
    if (s.isalpha()) == True: 
        count+=1
        newstring+=s
        
print(count) 
print(newstring) 

12
PriskaKasyap

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