Harvard:Biophysics 101/2007/Notebook:Resmi Charalel/2007-2-8

Script

 #!/usr/bin/env python

 from random import *

 mx=10
 countH=[0,0,0,0,0,0,0,0,0]
 countT=[0,0,0,0,0,0,0,0,0]

 #Generation of list of 10,000 strings of 10 random coinflips and tally of stretches of H's and T's
 for x in range(10000):
     s=[]
     for i in range(mx):
         random = choice(range(0,2,1))

         if random==0:
             s.append('H')

         if random==1:
             s.append('T')
         substr=.join(s)
        
     for i in range(9):
         substH = .join(['H' for n in range(i+2)])
         pos = substr.find(substH,0)
       
         while not pos == -1:
             countH[i] = countH[i] + 1
             pos = substr.find(substH,pos+1)
               
     for i in range(9):
         substT = .join(['T' for n in range(i+2)])
   
         pos = substr.find(substT,0)
         while not pos == -1:
             countT[i] = countT[i] + 1
             pos = substr.find(substT,pos+1)

 print "10,000 strings of 10 random coinflips were generated.  The following tallies of H's and T's were recorded." 
 print "Occurence(s) of HH:", countH[0]
 print "Occurence(s) of HHH:", countH[1]
 print "Occurence(s) of HHHH:", countH[2]
 print "Occurence(s) of HHHHH:", countH[3]
 print "Occurence(s) of HHHHHH:", countH[4]
 print "Occurence(s) of HHHHHHH:", countH[5]
 print "Occurence(s) of HHHHHHHH:", countH[6]
 print "Occurence(s) of HHHHHHHHH:", countH[7]
 print "Occurence(s) of HHHHHHHHHH:", countH[8]
 print "Occurence(s) of TT:", countT[0]
 print "Occurence(s) of TTT:", countT[1]
 print "Occurence(s) of TTTT:", countT[2]
 print "Occurence(s) of TTTTT:", countT[3]
 print "Occurence(s) of TTTTTT:", countT[4]
 print "Occurence(s) of TTTTTTT:", countT[5]
 print "Occurence(s) of TTTTTTTT:", countT[6]
 print "Occurence(s) of TTTTTTTTT:", countT[7]
 print "Occurence(s) of TTTTTTTTTT:", countT[8]