Below is the syntax highlighted version of birthdays.py
from §1.4 Arrays.
#----------------------------------------------------------------------- # birthdays.py #----------------------------------------------------------------------- import stdio import stdarray import sys import random # Accept an integer command-line argument n. Compute the number of # people (by simulation) that must enter a room until two of them # share a birthday. Assume birthdays are independent # and uniform from 0 to 364. Repeat the experiment n times, and write # the average number of people to standard output. DAYS_PER_YEAR = 365 n = int(sys.argv[1]) # Keep track of the count of people who have entered the room. peopleCount = 0 for i in range(n): # birthdaysSeen[birthday] = True iff someone who has entered the room # was born on day birthday. birthdaysSeen = stdarray.create1D(DAYS_PER_YEAR, False) # Perform the simulation. while True: peopleCount += 1 birthday = random.randrange(0, DAYS_PER_YEAR) if birthdaysSeen[birthday]: break # Two people with the same birthday, so break out of loop birthdaysSeen[birthday] = True stdio.writeln(float(peopleCount)/float(n)) #----------------------------------------------------------------------- # python birthdays.py 1 # 26.0 # python birthdays.py 10 # 24.0 # python birthdays.py 100 # 26.79 # python birthdays.py 1000 # 24.581 # python birthdays.py 10000 # 24.8073 # python birthdays.py 100000 # 24.57607