String Validators in Python - HackerRank Solution

Problem

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 .

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

Input Format

A single line containing a string .

Output Format

In the first line, print True if  has any alphanumeric characters. Otherwise, print False.

In the second line, print True if  has any alphabetical characters. Otherwise, print False.

In the third line, print True if  has any digits. Otherwise, print False.

In the fourth line, print True if  has any lowercase characters. Otherwise, print False.

In the fifth line, print True if  has any uppercase characters. Otherwise, print False.

Sample Input

qA2

Sample Output

True
True
True
True
True

---

Program:

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def alphanumber(s):
    for i in range(len(s)):
        if(s[i].isalnum()):
            return True
            break
    return False
        
def alpha(s):
    for i in range(len(s)):
        if(s[i].isalpha()):
            return True
            break
    return False

def number(s):
    for i in range(len(s)):
        if(s[i].isdigit()):
            return True
            break
    return False

def lower(s):
    for i in range(len(s)):
        if(s[i].islower()):
            return True
            break
    return False
     
def upper(s):
    for i in range(len(s)):
        if(s[i].isupper()):
            return True
            break
    return False
    
if __name__ == '__main__':
    s = input()
    print(alphanumber(s))
    print(alpha(s))
    print(number(s))
    print(lower(s))
    print(upper(s))