How do I left-align numbers in columns in Python?

I am trying to write a function that passes this doctest:

Prints a table of values for i to the power of 1,2,5 and 10 from 1 to 10
left aligned in columns of width 4, 5, 8 and 13
>>> print_function_table()
i   i*2 i*5    i*10
1   1    1       1
2   4    32      1024
3   9    243     59049
4   16   1024    1048576
5   25   3125    976562开发者_如何学编程5
6   36   7776    60466176
7   49   16807   282475249
8   64   32768   1073741824
9   81   59049   3486784401
10  100  100000  10000000000

I feel like I am almost there but I can't seem to left-align my columns.

the code i have is:

def print_function_table():
    i = 1
    s = "{:^4} {:^5} {:^8} {:^13}"
    print s.format("i", "i*2", "i*5", "i*10")
    while i <= 10:
        print s.format(i, i*2, i*5, i*10)
        i += 1

What about...

def print_function_table():
    s = "{:<4} {:<5} {:<8} {:<13}"
    print s.format("i", "i*2", "i*5", "i*10")
    for i in range(1,11):
        print s.format(i, i**2, i**5, i**10)

?