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What does the += operator do in Python?

easy📝 Conceptual Q11 of 15
Python - Operators and Expression Evaluation

What does the += operator do in Python?

AAdds the right value to the left variable and updates it
BAssigns a new variable without changing the old one
CSubtracts the right value from the left variable
DCreates a new list from two variables
Step-by-Step Solution
Solution:

  1. Step 1: Understand the meaning of +=

    The += operator adds the value on the right to the variable on the left.

  2. Step 2: Recognize it updates the variable

    It changes the original variable by adding the new value to it.

  3. Final Answer:

    Adds the right value to the left variable and updates it -> Option A

  4. Quick Check:

    += means add and assign [OK]
Quick Trick: Think: add then store back in same variable [OK]
Common Mistakes:
MISTAKES
  • Confusing += with simple assignment =
  • Thinking += creates a new variable
  • Mixing += with subtraction or multiplication

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