Python Interviews: Difference between revisions
→Swap Case
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= Swap Case =
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() checks if all the characters of a string are alphanumeric (a-z, A-Z and 0-9).
>>> print 'ab123'.isalnum()
True
str.isalpha() checks if all the characters of a string are alphabetical (a-z and A-Z).
>>> print 'abcD'.isalpha()
True
str.isdigit() checks if all the characters of a string are digits (0-9).
>>> print '1234'.isdigit()
True
str.islower() checks if all the characters of a string are lowercase characters (a-z).
>>> print 'abcd123#'.islower()
True
str.isupper() checks if all the characters of a string are uppercase characters (A-Z).
>>> print 'ABCD123#'.isupper()
True
<pre>
def swap_case(s):
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