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15 de sept. de 2015 · break. If you must have a one-liner (which would be counter to Python's philosophy, where readability matters ), use the next() function and a generator expression: i = next((elem for elem in my_list if elem == 'two'), None) which will set i to None if there is no such matching element.
This is one line of code (=w=). Though if written in exactly one-line, it could be too long to contradict PEP 8 E501. So this is a solution for fun. "sam" in locals checks if sam is a valid variable in the current environment; hasattr(sam, "__getitem__") checks if variable sam could be indexed by sam[n]; 0 < len(sam) checks if sam have more ...
The Python interpreter will join consecutive lines if the last character of the line is a backslash. This is helpful in some cases, but should usually be avoided because of its fragility: a white space added to the end of the line, after the backslash, will break the code and may have unexpected results.
21 de dic. de 2011 · I was thinking like creating a list that contains string1, string2 and string3, and check if any of these is contained in the line, but it doesn't seems that i can just compare the list without explicitly loop trough the list, and in that case I am basically in the same conditions as in the multiple if statement that I wrote above.
When we combine inwith not, we can test for a lack of membership: see if some value is notinside a string, list, or dictionary. Let’s take a closer look at these two approaches. If statements that use in. When an if statement uses the inoperator, it can see if a particular value is present. Let’s see how those work.
18 de ene. de 2017 · 19. I think because you do not specify the else part. You should write it as: return True if 'e' not in word else None. This is because Python sees it as: return <expr>. and you specify a ternary condition operator as <expr> which has syntax: <expr1> if <condition> else <expr2>. So Python is looking for your else part.
31 de jul. de 2020 · Method 2: Direct One-Liner If. Nothing simpler than that—just write it into a single line! def f(x): if x==0: return None. I should note that PEP 8 is actually fine with writing if block statements into a single line. Nevertheless, the default return value of a function is None so the code does really nothing.
