CSC111 Lab4 Solutions

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# Selected solutions for Lab 4
import os
 
def main1():
     Id = raw_input( "Please enter Id of student (e.g. aa) " )
     command = "111c-" + Id
     os.system( "lastlog -u " + command )       
 
def main2():
    for Id in "abcdefghijklmnopqrstuvwxyz":
        user = "111c-a" + Id
        os.system( "lastlog -u " + user )

def main3():
     for semester in [ 'a', 'b' ]:
         for Id in "abcdefghijklmnopqrstuvwxyz":
              user = "111c-" + semester + Id
              os.system( "lastlog -u " + user )

def main4():
     for second in "abcdefghijklmnopqrstuvwxyz":
          for first in "abc":
               print first+second,  # comma to stay on the same line
          print # once we've printed 3, go to next line

def main5():
     zoo = [ "pig", "horse", "elephant" ]
     count = 0
     for animal in zoo:
          count = count + 1
          for i in range( count ):
               print animal,
          print

def main6():
     for year in [ 2010, 2011, 2012, 2013]:
          for sem in [ "spring", "fall" ]:
               print sem, year
 
def main7():
     filename = raw_input( "Filename? " )
     filenameNoExtension = filename[0:-3]
     print filenameNoExtension + "txt"


main1()
main2()
main3()
main4()
main5()
main6()
main7()