Can't understand the code

[SelectiveDuplicate]

The following code is a solution for a string-related problem:

for method in [str.isalnum, str.isalpha, str.isdigit, str.islower, str.isupper]:
    print any(method(c) for c in s)

Here, "s" is a string.
I'm not familiar with third brackets in for loop, nor how class methods are being called here and how "c" is being passed as a parameter to "method".

The same code can be written in the following way:

t = type(s)
for method in [t.isalnum, t.isalpha, t.isdigit, t.islower, t.isupper]:
    print any(method(c) for c in s)

Can anyone kindly tell me what's happening in these codes?

NB: The problem corresponding to the codes is from HackerRank

[buran]

you iterate over methods of class str
so in first iteration method is actually str.isalnum, i.e. method(с) is same as str.isalnum(с)

any() will return True if at least one of the elements in the argument (which is (method( c ) for c in s))is True

[SelectiveDuplicate]

Thanks for explaining!