What will be the output of the following Python code?def foo(x): x[0] = ['def'] x[1] = ['abc'] return id(x)q = ['abc', 'def']print(id(q) == foo(q))
Question
What will be the output of the following Python code?
def foo(x):
x[0] = ['def']
x[1] = ['abc']
return id(x)
q = ['abc', 'def']
print(id(q) == foo(q))
Solution
The output of the given Python code will be True.
Here's the step-by-step explanation:
- A list
qis defined with two elements: 'abc' and 'def'. - The
id()function in Python returns the “identity” of an object, which is unique and constant for this object during its lifetime. - The function
foo(x)is defined, which takes a list as an argument. Inside this function, the first and second elements of the list are modified to ['def'] and ['abc'] respectively. Then, the function returns the id of the modified list. - When calling
foo(q), the listqis passed to the function. The function modifiesqand returns its id. - The
print()function compares the id ofqbefore and after the call tofoo(). Since lists are mutable in Python, the functionfoo()modifies the list in-place, without creating a new list. Therefore, the id of the list remains the same, and the comparisonid(q) == foo(q)returnsTrue. - So,
Trueis printed as the output of this Python code.
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