how to convert floats into ints in the mixed list with words, NaNs and floats? i have tried all the described ways, no one of them works

Можно проверять тип с помощью условия if type(x) == float.

Пример:

li = [True, 3.14159265, '177.013', 12, 11.7, 'word', None, False]

for i in range(len(li)):
    x = li[i]
    if type(x) == float:
        li[i] = int(x)

print(li)

stdout:

[True, 3, '177.013', 12, 11, 'word', None, False]