PCEP Practice Question: Data Types, Variables, Basic I/O and Operators
What is the result of 'bool(0) and bool(1)'?
⚠ Common exam trap
Python Institute often tests the distinction between boolean values and their integer equivalents (0 and 1), tricking candidates into thinking the result is an integer like `0` or `1` instead of the boolean `False` or `True`.
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 expression `bool(0) and bool(1)` evaluates to `False` because `bool(0)` converts the integer 0 to `False` (since 0 is falsy in Python), and `bool(1)` converts 1 to `True`. The `and` operator returns `True` only if both operands are truthy; here, `False and True` yields `False`.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
False
Why this is correct
Evaluating `bool(0)` yields `False`, and Python's `and` operator short-circuits: when the left operand is falsy, it returns that operand immediately without evaluating `bool(1)`. The expression therefore evaluates to `False`, satisfying the question's requirement for the result of this boolean conjunction.
- ✗
True
Why it's wrong here
Short-circuit evaluation stops at `bool(0)`, which is False, so the expression returns False, not True. True is tempting because `bool(1)` is True and the `and` operator requires both operands truthy, but the first operand already fails, so the second is never evaluated.
- ✗
1
Why it's wrong here
The `and` operator returns the first falsy operand, which is the Boolean False from `bool(0)`, not the integer 1. The value 1 is tempting because `bool(1)` is True and 1 is truthy, but short-circuiting means the second operand is never reached.
- ✗
0
Why it's wrong here
Python's `and` returns the first falsy operand, so `bool(0) and bool(1)` evaluates `bool(0)` as False and short-circuits, yielding the Boolean False, not the integer 0. The value 0 is tempting because `bool(0)` is False and 0 is falsy, but the operator returns the operand itself, never a coerced integer.
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Same concept, more angles
2 more ways this is tested on PCEP
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. What is the result of bool(0) in Python?
easy- A.0
- B.None
- C.True
- ✓ D.False
Why D: 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.
Variation 2. Which TWO of the following expressions evaluate to True?
medium- A.bool('')
- B.bool([])
- ✓ C.bool(1)
- ✓ D.bool('False')
- E.bool(0)
Why C: Option C, bool(1), evaluates to True because any non-zero integer is truthy in Python, and 1 is the canonical non-zero value. Option D, bool('False'), also evaluates to True because any non-empty string is truthy regardless of its content — the string 'False' has five characters, so it is truthy. The unmarked options do not belong: bool('') is False because an empty string is falsy, bool([]) is False because an empty list is falsy, and bool(0) is False because zero is the integer falsy value.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PCEP practice question is part of Courseiva's free Python Institute certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCEP exam.