Unable to use *= python operator in list comprehension [duplicate]

Question

I'm not sure why I'm unable to use the *= operator in a list comprehension, when using it in a for loop is fine?

def funcLC(l):
    ans = 1
    [ans *= x for x in l if x < 0]
    return ans

SyntaxError: invalid syntax

def funcFor(l):
    ans = 1
    for x in l:
        if x < 0:
            start *= x
    return ans

Answer 1

The assignment operator (and all variations on it) forms a statement in Python, not an expression. Unfortunately, list comprehensions (and other comprehensions, like set, dictionary and generators) only support expressions.