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Which of the following variable names is valid in Python?

easy📝 Syntax Q3 of 15
Python - Variables and Dynamic Typing
Which of the following variable names is valid in Python?
Auser-name
B3rdValue
Ctotal_sum
Dclass
Step-by-Step Solution
Solution:

  1. Step 1: Check variable naming rules

    Variable names must start with a letter or underscore, and cannot contain hyphens or be Python keywords.

  2. Step 2: Evaluate each option

    "total_sum" starts with a letter and uses only letters and underscore, so it's valid. "3rdValue" starts with a digit, invalid. "user-name" contains a hyphen, invalid. "class" is a Python keyword, invalid as variable name.

  3. Final Answer:

    total_sum -> Option C

  4. Quick Check:

    Valid variable names start with letter/underscore and avoid keywords [OK]
Quick Trick: Variable names can't start with digits or use keywords [OK]
Common Mistakes:
MISTAKES
  • Starting variable names with numbers
  • Using hyphens in variable names
  • Using Python reserved keywords as variable names

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