String Validators (Python 3)

• URL : https://www.hackerrank.com/challenges/string-validators/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).

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>>> 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).

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

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

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    >>> 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).

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    >>> 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).

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    >>> 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.

문제풀이

• 주어진 string S에서 isalnum, isalpha, isdigit, islower, isupper가 참이되는 문자가 있으면 true 반환 없으면 False
• any(x)는 반복 가능한(iterable) 자료형 x를 입력 인수로 받으며 이 x의 요소 중 하나라도 참이 있으면 True를 돌려주고, x가 모두 거짓일 때에만 False를 돌려준다. all(x)의 반대이다.
• 그래서 any 함수를 이용하여 for문의 리스트컴프리헨션을 사용하고 True가 하나라도 있으면 any함수를 통해 True가 반환되게 짬
• 솔직히 any함수가 있었는지 몰랐는데, 이번기회에 알게되었음

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

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 qA2


True
True
True
True
True