This PCEP practice question tests your understanding of data types, variables, basic i/o and operators. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 variable names is NOT valid in Python?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "NOT"
Why it matters: Negative qualifier — you are looking for the one option that does NOT apply. Most options will be true; only one is false for this scenario.
My_Var
Why wrong: Valid; uppercase and underscores allowed.
_myVar
Why wrong: Valid; starts with underscore.
2nd_place
Invalid; starts with a digit.
myVar2
Why wrong: Valid; digits can appear after the first character.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
2nd_place
Option C is correct because Python variable names cannot begin with a digit. The name '2nd_place' starts with '2', which violates Python's identifier naming rules. Valid variable names must start with a letter (a-z, A-Z) or an underscore (_), followed by letters, digits, or underscores.
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.
My_Var
Why it's wrong here
Valid; uppercase and underscores allowed.
_myVar
Why it's wrong here
Valid; starts with underscore.
2nd_place
Why this is correct
Invalid; starts with a digit.
Clue confirmation
The clue word "NOT" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
myVar2
Why it's wrong here
Valid; digits can appear after the first character.
Common exam traps
Python Institute often tests the rule that variable names cannot start with a digit, and the trap here is that candidates may focus on the underscore or mixed case and overlook the leading digit, mistakenly thinking '2nd_place' is acceptable because it contains letters and underscores.
Detailed technical explanation
Python's identifier rules are defined in PEP 3131 and the Python language reference. Under the hood, the parser uses a lexical grammar that rejects tokens starting with a digit as identifiers, treating them as numeric literals instead. This rule prevents ambiguity between variable names and numeric constants, which is critical in parsing expressions like '2nd_place = 5' where '2nd' would be misinterpreted as a number.
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.
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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: 2nd_place — Option C is correct because Python variable names cannot begin with a digit. The name '2nd_place' starts with '2', which violates Python's identifier naming rules. Valid variable names must start with a letter (a-z, A-Z) or an underscore (_), followed by letters, digits, or underscores.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "NOT". Negative qualifier — you are looking for the one option that does NOT apply. Most options will be true; only one is false for this scenario.
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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