HackerRank Python Solution - Strings - 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()
True
>>> print 'ab123#'.isalnum()
False

str.isalpha():

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

>>> print 'abcD'.isalpha()
True
>>> print 'abcd1'.isalpha()
False

str.isdigit():

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

>>> print '1234'.isdigit()
True
>>> print '123edsd'.isdigit()
False

str.islower():

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

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

str.isupper():

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

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

Task:

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

Input Format:

• A single line containing a string S.

Constraints:

• 0 < len(S) < 1000

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.

Sample Input:

qA2

Sample Output:

True
True
True
True
True

Solution:

if __name__ == '__main__':
    s = input()

    print(any([char.isalnum() for char in s]))
    print(any([char.isalpha() for char in s]))
    print(any([char.isdigit() for char in s]))
    print(any([char.islower() for char in s]))
    print(any([char.isupper() for char in s]))

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