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Why is this an issue?

A chain of if/else if statements is evaluated from top to bottom. At most, only one branch will be executed: the first one with a condition that evaluates to true.

Therefore, duplicating a condition automatically leads to dead code. Usually, this is due to a copy/paste error. At best, it’s simply dead code and at worst, it’s a bug that is likely to induce further bugs as the code is maintained, and obviously it could lead to unexpected behavior.

Noncompliant code example

if param == 1:
  openWindow()
elif param == 2:
  closeWindow()
elif param == 1:            # Noncompliant
  moveWindowToTheBackground()

Compliant solution

if param == 1:
  openWindow()
elif param == 2:
  closeWindow()
elif param == 3:
  moveWindowToTheBackground()




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