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Apr 1, 2014 · In some cases, elif is required for correct semantics. This is the case when the conditions are not mutually exclusive: if x == 0: result = 0 elif y == 0: result = None else: result = x / y. In some cases it is efficient because the interpreter doesn't need to check all conditions, which is the case in your example.
Feb 14, 2012 · Sorted by: 183. Multiple if's means your code would go and check all the if conditions, where as in case of elif, if one if condition satisfies it would not check other conditions.. answered Feb 14, 2012 at 4:34. avasal. 14.8k43249. 70. An other easy way to see the difference between the use of if and elif is this example here:
Mar 5, 2013 · "Elif" seems to have originated with the C preprocessor, which used #elif long before Python AFAICT. Obviously, in that context having a single-token directive is valuable, since parsing #else if <code> vs. #else <code that could theoretically even be an if statement> would've complicated a syntax that was intended to be bog-simple.
18. "else if" isn't always a single keyword. For example, in C#, it's just a nested if similar to how I wrote it out in my first example. It's just that C# doesn't care about whitespace as much as python, so it's valid to write out "else if" on one line. As for why it's called "elif" instead of "elseif", "elsif", or anything else, I have no idea.
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May 26, 2018 · 3. use a lambda function (or a named function) with apply. df.Category = df.Sales.apply(. lambda x: 'Fast Movers' if x >=300 else ('Medium Fast Movers' if x >= 200 else 'Slow Movers') ) instead of the lambda, a named function can be defined like this: def move_speed(x): if x >= 300: return 'Fast Movers'.
Jan 6, 2016 · Simply speaking, When you have LEFT or RIGHT like code in python, the LEFT and RIGHT expressions are evaluated first. In your case, this is what happens. LEFT is cell_color == 'green and RIGHT is yellow. When you pass "red" as the color, LEFT evaluates to false. Since the LEFT expression was False, RIGHT is evaluated.
Dec 25, 2012 · x = 2. elif i < 100: x = 1. else: x = 0. If you want to use the above-mentioned code in one line, you can use the following: x = 2 if i > 100 else 1 if i < 100 else 0. On doing so, x will be assigned 2 if i > 100, 1 if i < 100 and 0 if i = 100. answered Jan 10, 2019 at 3:24.
May 12, 2020 · 9. Assuming the invalid syntax is a typo, the big benefit of elif vs having an else statement with a nested if is indentation. Each time you go into a nested if you'll need to indent again, which will destroy readability. On the other hand by using elif you'll be able to have all the different code paths on the same level of indentation.
Oct 23, 2010 · @Mark, I agree... but it messes me up sometimes because I'm used to languages that have an elseif. I know it's identical, but I wonder what javascript's reason is for leaving it out. I am glad, however, that they didn't use elif, because that's just wrong :) –
