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pythonloopsinfinite

I can't add some of elements in Python

start_list = [5, 3, 1, 2, 4]
square_list = []
for x in start_list:
    square_list.append(start_list.append(x**2))
    square_list.sort()
    print square_list

I want to add start_list's elements and their sqrt in square_list. But it'll be infinite loop. (I guess, it happened in (start_list.append(x**2) ) How can i fix it?

Solution

  • The .append(start_list.append(x**2)) call should, if I understand what you're going for, not actually be append(append()) but just a lookup. Since you're iterating over your list items, the x value is the value you want to append to square_list.

    for x in start_list:
    square_list.append(x**2)

    However, the list comprehension technique is probably the 'righter' answer, as it's Pythonic and excellent.