We can pack multiple if-loops and if-else within a list generators. Here is an example : >>> [i*j for i in range(1,10) for j in range(1,10) if i==j ] [1, 4, 9, 16, 25, 36, 49, 64, 81]
Another one: >>> noprimes = [j for i in range(2, 8) for j in range(i*2, 50, i)] >>> primes = [x for x in range(2, 50) if x not in noprimes] >>> print primes [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47] The first code print squares and second print primes until 50. First code show a nested for-loop in list-comprehension and second code shows a multiple if-else loop in noprimes[] and for-loop with an if-loop in prime[]. However what if I want an if-else loop in nested for loop. example ( http://codepad.org/oshZLAbE ), the code is crappy..made it just for the heck of it but want to know the syntax and the way of approaching.
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