Code like this:
if cond1 and cond2:
pass
elif cond1:
pass
Has a hidden dependency on the order that the conditions are checked.
This makes them fragile and subject to breakage during refactors.
Rewrite the code like this:
if cond1:
if cond2:
pass
else:
pass
The nested structure makes the ordering explicit and less likely for
someone to break the code when they refactor.
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