This question tests your knowledge of how Python handles mutable default arguments in function definitions.
It explores the behavior of default arguments, particularly when the default value is a mutable object like a list.
Understanding this concept is crucial to avoid unintended side effects in your Python programs.
Contents
Question: Mutable Default Arguments in Python
What will be the output of the following Python code snippet?
def func(x=[]):
x.append(len(x))
return x
print(func())
print(func())Answer: C
Explanation:
The default argument x=[] is evaluated only once, so the same list is used in each call to func.
When the function is called the first time, it appends 0 to the list. When called again, it appends 1 to the same list, resulting in [0, 1].
