This PCEP practice question tests your understanding of data types, variables, basic i/o and operators. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A program calculates BMI. User inputs weight and height as strings. Which line correctly converts to float?
weight = float(input)
Why wrong: input is a function object, not its result.
weight = input().float()
Why wrong: No method .float() exists on strings.
weight = float(input())
Correct; input() returns string, float() converts.
weight = input(float())
Why wrong: Invalid syntax; float() has no argument.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
weight = float(input())
Option C is correct because `float(input())` first reads the user's input as a string via `input()`, then converts that string to a floating-point number using the `float()` function. This is the standard Python pattern for converting user input to a numeric type.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
weight = float(input)
Why it's wrong here
input is a function object, not its result.
weight = input().float()
Why it's wrong here
No method .float() exists on strings.
weight = float(input())
Why this is correct
Correct; input() returns string, float() converts.
Related concept
Read the scenario before looking for a memorised answer.
weight = input(float())
Why it's wrong here
Invalid syntax; float() has no argument.
Common exam traps
Python Institute often tests the distinction between calling a function (`float(input())`) versus referencing it (`float(input)`) or chaining a non-existent method (`input().float()`), exploiting the common confusion that methods and functions are interchangeable.
Detailed technical explanation
The `input()` function always returns a string, even if the user types digits. The `float()` constructor can parse a string representation of a number (e.g., '3.14' or '2.0e5') into a Python float, but it will raise a `ValueError` if the string is not a valid numeric literal. In real-world BMI calculators, you often wrap the conversion in a try-except block to handle invalid input gracefully.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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FAQ
Data Types, Variables, Basic I/O and Operators — This question tests Data Types, Variables, Basic I/O and Operators — Read the scenario before looking for a memorised answer..
The correct answer is: weight = float(input()) — Option C is correct because `float(input())` first reads the user's input as a string via `input()`, then converts that string to a floating-point number using the `float()` function. This is the standard Python pattern for converting user input to a numeric type.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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.
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