PCEP Practice Question: Data Types, Variables, Basic I/O and Operators
What is the result of bool(0) in Python?
⚠ Common exam trap
Python Institute often tests the misconception that bool(0) returns 0 or None, exploiting candidates who confuse the integer value 0 with the Boolean False, or who think that only the literal False keyword is falsy.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
False
The bool() function in Python converts any value to a Boolean. The integer 0 is considered a falsy value, so bool(0) returns False. This is because Python defines 0, None, empty collections, and False itself as falsy.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
0
Why it's wrong here
bool(0) returns the Boolean False, not the integer 0; bool() always yields a bool object, never the original numeric type. Returning 0 is tempting because the input is 0, but the function's purpose is truth-value conversion, so the output type differs from the input.
- ✗
None
Why it's wrong here
bool(0) returns False, not None; None is a distinct singleton representing absence of value, and bool(None) is also False. None is tempting as a falsy result, but bool() never returns None — it returns one of the two Boolean constants True or False.
- ✗
True
Why it's wrong here
bool(0) returns False because zero is falsy in Python; True is returned only for non-zero numbers, non-empty containers and other truthy objects. True is tempting because bool() converts values to Boolean type, but the conversion preserves truthiness, not the numeric value itself.
- ✓
False
Why this is correct
bool() converts any value to a Boolean using Python's truthiness rules. Zero is falsy, so bool(0) returns False. Non-zero numbers, non-empty strings and non-empty containers are truthy, but the integer 0 specifically evaluates to False.
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