Question

print 077777#how can i get binary

i use python2.5

Answer 1

Simplest (not fastest!) way to get a binary string for an int in Python 2.5:

def dobin(n):
  digs = []
  s = ''
  if n<0:
    s = '-'
    n = -n
  while True:
    digs.append(str(n % 2))
    n /= 2
    if not n: break
  if s: digs.append(s)
  digs.reverse()
  return ''.join(digs)

Are you looking for speed, or for clarity?