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Is there an efficiency difference between using and in an if statement and using multiple if statements? In other words, is something like
if expr1 == expr2 and expr3==expr4:
dostuff()
different from an efficiency standpoint then:
if expr1 == expr2:
if expr3 == expr4:
dostuff()
My very basic testing does not reveal a difference, but does someone with more knowledge (or at least more thorough testing) have a definitive answer?
861
Python supports multiple independent conditions in the same if block. Say you want to test for one condition first, but if that one isn't true, there's another one that you want to test.
Multiple 'if' statements get checked one after another with no regard to the former's results. 'Elif' acts as 'else if', so is checked only in the 'else' case - that is only then, if the first 'if' is False.
The elif is short for else if. It allows us to check for multiple expressions. If the condition for if is False , it checks the condition of the next elif block and so on. If all the conditions are False , the body of else is executed.
This isn't enough of a performance difference, if any, to affect your decision. IMO, the decision here should be made purely from a readability perspective. The first is generally more standard, I think, but there are situations when the second might be clearer. Choose the method that best gets your intent across.
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