isalpha Python

In most cases, there may be 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 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

string.isalpha()

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

Examples of isalpha()

name = "Priska"
print(name.isalpha())

# contains whitespace
name = "Priska Kashyap"
print(name.isalpha())

# contains number
name = "Priska234232Kasyap"
print(name.isalpha())

The above code returns the following output -

As, you can show in the above example, it returns true only for alphabetic strings. The space is also not considered as alphabetic that's why returns false.

Filter non alphabetic characters using isalpha

This method can also be used to filter the non alphabetic characters. In the given example, we have taken a string that contain non-alphabetic characters. We have looped over the string and filtered the string using isalpha() method -

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

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

The above code returns the following output -

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