Python expected an indented block

Question

I am a newbie to Python and would like to genereate some numbers according to geometric distribution. i found this code on Internet but isn´t work:

  import          


        

Answer 1

Correct syntax (indent for each block. Most of those start after lines ending in ":"):

import random
from math import ceil, log

def geometric(p):

  # p should be in (0.0, 1.0].
  if ((p <= 0.0) or (p >=1.0)):
    raise ValueError("p must be in the interval (0.0, 1.0]")
  elif p == 1.0:
    # If p is exactly 1.0, then the only possible generated value is 1.
    # Recognizing this case early means that we can avoid a log(0.0) later.
    # The exact floating point comparison should be fine. log(eps) works just
    # dandy.
    return 1

  # random() returns a number in [0, 1). The log() function does not
  # like 0.
  U = 1.0 - random.random()

  # Find the corresponding geometric variate by inverting the uniform variate.
  G = int(ceil(log(U) / log(1.0 - p)))
  return G

p=1.0/2.0
for i in range(10):
  print geometric(p)