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.
Which of the following is a valid floating-point literal in Python?
1e3
Why wrong: Also a float literal, but 3.14 is more standard; however only one correct expected.
'3.14'
Why wrong: String literal.
3.14
Decimal floating-point literal.
0xFF
Why wrong: Hexadecimal integer literal.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
3.14
Option C is correct because `3.14` is a literal decimal number with a fractional part, which Python interprets as a floating-point value. Floating-point literals in Python can be written in decimal notation with a dot, or in scientific notation (e.g., `1e3`), but `3.14` is the only option here that is both a numeric literal and explicitly a float.
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.
1e3
Why it's wrong here
Also a float literal, but 3.14 is more standard; however only one correct expected.
'3.14'
Why it's wrong here
String literal.
3.14
Why this is correct
Decimal floating-point literal.
Related concept
Read the scenario before looking for a memorised answer.
0xFF
Why it's wrong here
Hexadecimal integer literal.
Common exam traps
Python Institute often tests the distinction between numeric literals and string literals, and the trap here is that candidates may confuse a string like `'3.14'` with a float, or think that hexadecimal `0xFF` is a float because it contains letters, when in fact it is an integer.
Detailed technical explanation
Floating-point literals in Python follow IEEE 754 double-precision representation, and they can be written in decimal form (e.g., `3.14`) or scientific notation (e.g., `1e3`, `3.14e-2`). Under the hood, `3.14` is stored as a binary fraction, which may cause precision issues (e.g., `0.1 + 0.2` not exactly equaling `0.3`). In real-world applications like financial calculations, this imprecision is critical and often requires the `decimal` module instead of native floats.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the PCEP exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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: 3.14 — Option C is correct because `3.14` is a literal decimal number with a fractional part, which Python interprets as a floating-point value. Floating-point literals in Python can be written in decimal notation with a dot, or in scientific notation (e.g., `1e3`), but `3.14` is the only option here that is both a numeric literal and explicitly a float.
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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