Using function argument in lists comprehension.

[snippsat]

Can also make it a string,and then count.
As string count() method counts occurrences of substring,and list count() method counts whole values in list.

>>> lst = [1, 4, 9, 16, 25, 36, 49, 64, 81]
>>> s = ''.join(str(i) for i in lst)
>>> s
'149162536496481'
>>> s.count('1')
3

>>> help(s.count)
Help on method_descriptor:

count(...)
    S.count(sub[, start[, end]]) -> int
    
    Return the number of non-overlapping occurrences of substring sub in
    string S[start:end].  Optional arguments start and end are
    interpreted as in slice notation.