HackerRank Python: String Validators Solution

Table of Contents

Question

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 .

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

				
					s = input().strip()

print(any(c.isalnum() for c in s))
print(any(c.isalpha() for c in s))
print(any(c.isdigit() for c in s))
print(any(c.islower() for c in s))
print(any(c.isupper() for c in s))

Explanation

The input string s is read from the user.
The first print statement checks if there are any alphanumeric characters in the string. It uses the any function along with a generator expression to iterate over each character in the string and check if it is alphanumeric using the isalnum method.
The second print statement checks if there are any alphabetical characters in the string. It uses a similar approach with the any function and the isalpha method.
The third print statement checks if there are any digits in the string using the isdigit method.
The fourth print statement checks if there are any lowercase characters in the string using the islower method.
The fifth print statement checks if there are any uppercase characters in the string using the isupper method.
Each statement prints either True or False based on the result of the corresponding check.