Simple function to convert decimal number to binary in Python

Question

I'm trying to convert a decimal number in binary but I can't seem to understand why my code doesn't work. Before checking it I need to precise that:

• I am not allowed to use modulo, division, powers, or any libraries
  that might help me to accomplish my goal.
• I can use multiplication, addition, subtraction as well as comparisons.

That said, here is my code:

def binary_conv(n):
 p1 = 1
 p2 = 1
 lst = list()
 counter1 = 0
 counter2 = 0
 while p1 <= n:
 p1 *=2
 counter1 += 1
 len_bin = counter1
 lst = len_bin*[0]
 counter1 -= 1
 while n > 0:
 p2 *= 2
 counter2 += 1
 if (p2*2) == p1:
 lst[counter1-counter2] = 1
 p1 = p2
 p2 = 1
 n = n-p1
 counter2= 0
 print(lst)

If you need more clarifications, don't hesitate to ask.

• AMC: doesn't work. What does that mean, specifically?
• MM1: I don't get the output wanted

Answer 1

I actually found the answer, here it is for those interested:

def binary_conv(n):
 p1 = 1
 p2 = 1
 lst = list()
 counter1 = 0
 counter2 = 0
 while p1 <= n:
 p1 *= 2
 counter1 += 1
 len_bin = counter1
 lst = len_bin*[0]
 counter1 -= 1
 while n > 0:
 p2 *= 2
 counter2 += 1
 if (p2 * 2) > n:
 if n == 1:
 lst[-1] = 1
 break
 lst[counter1 - counter2] = 1
 p1 = p2
 p2 = 1
 n = n - p1
 counter2 = 0