The Python Quiz | What is the output of the following code snippet? def foo(a=[]): a.append(5) return a foo() foo() foo()

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Question #114

What is the output of the following code snippet?

def foo(a=[]):
    a.append(5)
    return a

foo()
foo()
foo()

The list keeps getting longer and longer. The function keeps using the same object a as a default argument. The first time the function is executed, a does not exist: it is created as an empty list. The second time the function is executed, a already exists: 5 is appended to it. (effbot.org/zone/default-values.htm)

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Comment on Twitter:

What is the output of the following code snippet?
def foo(a=[]):
a.append(5)
return a

foo()
foo()
foo()

[5]
[5,5]
[5,5,5]

[5]
[5]
[5]#python #python3 #pythonprogramming #learnpython
— The Python Quiz (@thepythonquiz) July 10, 2020

Question difficulty: 🔵🔵🔵🔵🔵