Simple function (before generators)

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TODO: probably not that interesting

examples/generators/simple_function.py

def number():
    return 42

print(number())    # 42
print(number())    # 42
print(number())    # 42

examples/generators/simple_function_multiple_return.py

def number():
    return 42
    return 19
    return 23

print(number()) # 42
print(number()) # 42
print(number()) # 42