Count the uppercase letters in a string with Python

Question

I am trying to figure out how I can count the uppercase letters in a string.

I have only been able to count lowercase letters:

def n_lower_chars(st         


        

Answer 1

The (slightly) fastest method for this actually seems to be membership testing in a frozenset

import string
message='FoObarFOOBARfoobarfooBArfoobAR'
s_upper=frozenset(string.uppercase)

%timeit sum(1 for c in message if c.isupper())
>>> 100000 loops, best of 3: 5.75 us per loop

%timeit sum(1 for c in message if c in s_upper)
>>> 100000 loops, best of 3: 4.42 us per loop