shreyas shreyas - 1 year ago 279
Python Question

Check if string is upper, lower, or mixed case in Python

I want to classify a list of string in Python depending on whether they are upper case, lower case, or mixed case

How can I do this?

Answer Source

There are a number of "is methods" on strings. islower() and isupper() should meet your needs:

>>> 'hello'.islower()

>>> [m for m in dir(str) if m.startswith('is')]
['isalnum', 'isalpha', 'isdigit', 'islower', 'isspace', 'istitle', 'isupper']

Here's an example of how to use those methods to classify a list of strings:

>>> words = ['The', 'quick', 'BROWN', 'Fox', 'jumped', 'OVER', 'the', 'Lazy', 'DOG']
>>> [word for word in words if word.islower()]
['quick', 'jumped', 'the']
>>> [word for word in words if word.isupper()]
['BROWN', 'OVER', 'DOG']
>>> [word for word in words if not word.islower() and not word.isupper()]
['The', 'Fox', 'Lazy']
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