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Why does the expression if a and b or c: sometimes produce unexpected results?

hard📝 Conceptual Q10 of 15
Python - Conditional Statements
Why does the expression if a and b or c: sometimes produce unexpected results?
A'and' and 'or' have the same precedence and evaluate left to right
BBecause 'and' has higher precedence than 'or', changing evaluation order
CPython does not support mixing \"and\" and \"or\" in one expression
DBecause 'or' has higher precedence than 'and'
Step-by-Step Solution
Solution:

  1. Step 1: Recall operator precedence

    In Python, 'and' has higher precedence than 'or', so 'a and b or c' is evaluated as '(a and b) or c'.

  2. Step 2: Understand impact

    This can cause unexpected results if the programmer expects left-to-right evaluation without parentheses.

  3. Final Answer:

    Because 'and' has higher precedence than 'or', changing evaluation order -> Option B

  4. Quick Check:

    Operator precedence affects evaluation order [OK]
Quick Trick: Use parentheses to clarify mixed 'and'/'or' expressions [OK]
Common Mistakes:
MISTAKES
  • Assuming left-to-right evaluation
  • Ignoring operator precedence
  • Mixing without parentheses

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