One-line Python programs

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One-line Python programs

Sometimes, Python exercises require solving the problem in one line of code. Even if this is not required, one-line solutions are fun to write. Besides, a short program doesn't leave too much space for bugs.

A factorial can be coded as

 print((lambda foo, i: foo(foo, i))(lambda f, n: 1 if n == 0 else f(f, n-1)*n, int(input())))

Printing the odd elements of a list.

 print(*map(lambda a:a[1], filter(lambda x: x[0]%2==0, enumerate(input().split()))))

or

 print(*input().split()[0::2])

The maximum element of the list and its index.

 print(*reversed(max(enumerate(map(int,input().split())),key=lambda a:a[1])))

Inserting a character between every pair of characters in a given string.

 print(input().replace(,'*')[1 : -1])

or

 print("*".join(tuple(input())))