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
q
is 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 listq
is passed to the function. The function modifiesq
and returns its id. - The
print()
function compares the id ofq
before 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,
True
is printed as the output of this Python code.
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