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Functions can be created as objects using lambda.
Syntax is lambda <ARGS>: <EXPRESSION>:
f = lambda x: x * x
print(f(2))
4
g = lambda: 7
print(g())
7
Such lambda functions do not accept statements like if or for and are as such not as versatile as functions declared with def.
Typical use case is to construct a simple function on the fly when used as a function argument. Drawback is that lambda expressions don't carry a name which might affect readability:
def numbers(n, filter_function):
return [i for i in range(n) if filter_function(i)]
print(numbers(10, lambda n: n < 5))
print(numbers(10, lambda n: n % 3 == 1))
[0, 1, 2, 3, 4] [1, 4, 7]