coinflipper.py

import random
import sys 

try:
    population_size = int(sys.argv[1])
except:
    e = sys.exc_info()[0]
    print "Please enter the population sample size i.e how many times to filp the coin"
    sys.exit()

random.seed() #seeding means to provide a random starting point for the programme from the sysclock
num_head = num_tail = 0 #counters for number of heads and tails
sample_holder = []  

for __ in xrange(population_size):
    message = ""
    data = random.randint(0,1)
    if data == 1:
        message = "H" 
        num_head = num_head + 1 
    elif data == 0:
        message = "T" 
        num_tail = num_tail + 1 
    sample_holder.append(message)

print sample_holder
print "Number of Heads : " + str(num_head)
print "Number of Tails : " + str(num_tail)
print "P(H) : " + str(float(num_head)/population_size)
print "P(T) : " + str(float(num_tail)/population_size)

Takes [1] argument - The population size (i.e number of times to flip the coin)

1. Creates and populates heads and tails in a list
2. Prints the number of occurrence of Heads and tails
3. Calculates the probability of occurrence of Heads and tails in the population sample i.e P(H) and P(T)