String Validators

Python has built-in string validation methods for basic data. It can check if a string is composed of alphabetical characters, alphanumeric characters, digits, etc.

str.isalnum()
This method checks if all the characters of a string are alphanumeric (a-z, A-Z and 0-9).

print('ab123'.isalnum())
#prints True
print('ab123#'.isalnum())
#prints False

str.isalpha()
This method checks if all the characters of a string are alphabetical (a-z and A-Z).

print('abcD'.isalpha())
#prints True
print('abcd1'.isalpha())
#prints False

str.isdigit()
This method checks if all the characters of a string are digits (0-9).

print('1234'.isdigit())
#prints True
print('123edsd'.isdigit())
#prints False

str.islower()
This method checks if all the characters of a string are lowercase characters (a-z).

print('abcd123#'.islower())
#prints True
print('Abcd123#'.islower())
#prints False

str.isupper()
This method checks if all the characters of a string are uppercase characters (A-Z).

print('ABCD123#'.isupper())
#prints True
print('Abcd123#'.isupper())
#prints False  

Try the following example in the editor below.

You are given a string S. Your task is to find out if the string contains: alphanumeric characters, alphabetical characters, digits, lowercase and uppercase characters.

Output Format

In the first line, print True if S has any alphanumeric characters. Otherwise, print False.
In the second line, print True if S has any alphabetical characters. Otherwise, print False.
In the third line, print True if S has any digits. Otherwise, print False.
In the fourth line, print True if S has any lowercase characters. Otherwise, print False.
In the fifth line, print True if S has any uppercase characters. Otherwise, print False.