Solution: Many validator functions

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examples/functional/many_validators.py

def is_big(x):
    return x > 100

def is_even(x):
    return not x % 2

numbers = [90, 102, 101, 104]

cond = [is_big, is_even]

z = filter( lambda n: all([f(n) for f in cond]),   numbers)
print(z) # [102, 104]