Ignore case in string comparison

问题

If I have two variables, a and b and they could be integers, float, or strings.

I want to return True if they are equal (in case of string, ignore case).

As Pythonic as possible.

回答1:

This is the most pythonic I can think of. Better to ask for foregiveness than for permission:

>>> def iequal(a, b):
...    try:
...       return a.upper() == b.upper()
...    except AttributeError:
...       return a == b
... 
>>> 
>>> iequal(2, 2)
True
>>> iequal(4, 2)
False
>>> iequal("joe", "Joe")
True
>>> iequal("joe", "Joel")
False

回答2:

How about this, without isinstance (frowned upon):

def equal(a, b):
    try:
        return a.lower() == b.lower()
    except AttributeError:
        return a == b

回答3:

>>> def equals_ignore_case(a,b):
...   return a.upper() == b.upper()
...
>>> equals_ignore_case("hello","Hello")
True

来源：https://stackoverflow.com/questions/11993206/ignore-case-in-string-comparison