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lines changed Original file line number Diff line number Diff line change 1+ # 8.1 review exercises
2+
3+
4+ # Test whether these expressions are True or False
5+ print (1 <= 1 )
6+ print (1 != 1 )
7+ print (1 != 2 )
8+ print ("good" != "bad" )
9+ print ("good" != "Good" )
10+ print (123 == "123" )
Original file line number Diff line number Diff line change 1+ # 8.2 review exercises
2+
3+
4+ # Test whether these expressions are True or False
5+ print ((1 <= 1 ) and (1 != 1 ))
6+ print (not (1 != 2 ))
7+ print (("good" != "bad" ) or False )
8+ print (("good" != "Good" ) and not (1 == 1 ))
Original file line number Diff line number Diff line change 1+ # 8.3 review exercises
2+
3+
4+ # Display whether the length of user input is <, > or = 5 characters
5+ my_input = input ("Type something: " )
6+
7+ if len (my_input ) < 5 :
8+ print ("Your input is less than 5 characters long." )
9+ elif len (my_input ) > 5 :
10+ print ("Your input is greater than 5 characters long." )
11+ else :
12+ print ("Your input is 5 characters long." )
Original file line number Diff line number Diff line change 1+ # 8.4 review exercises
2+
3+
4+ # Run in an infinite loop until the user types "q" or "Q"
5+ while True :
6+ my_input = input ('Type "q" or "Q" to quit: ' )
7+ if my_input .upper () == "Q" :
8+ break
9+
10+ # Display every number from 1 through 50 except multiples of 3
11+ for i in range (1 , 51 ):
12+ if i % 3 == 0 :
13+ continue
14+ print (i )
Original file line number Diff line number Diff line change 1+ # 8.5 review exercises
2+
3+
4+ # Ask the user to enter an integer.
5+ # Repeat the process if the user hasn't entered an integer.
6+ repeat = True
7+ while repeat :
8+ try :
9+ my_input = input ("Type an integer: " )
10+ print (int (my_input ))
11+ repeat = False
12+ except ValueError :
13+ print ("try again" )
Original file line number Diff line number Diff line change 1+ # 8.6 review exercises
2+
3+ from random import randint
4+
5+
6+ # Simulate the toss of a die
7+ print (randint (1 , 6 ))
8+
9+
10+ # Simulate 10,000 throws of dice and display the average result
11+ trials = 10000
12+ total = 0
13+ for trial in range (0 , trials ):
14+ total += randint (1 , 6 )
15+ avg_result = total / trials
16+ print ("The average result of {} throws was {}" .format (trials , avg_result ))
Original file line number Diff line number Diff line change 1+ # 8.6.2 coin_toss.py
2+ # Simulate the results of a series of coin tosses and track the results
3+
4+ from random import randint
5+
6+ flips = 0
7+ trials = 10000
8+
9+ for trial in range (0 , trials ):
10+ flips += 1 # first flip
11+ if randint (0 , 1 ) == 0 : # flipped tails on first flip
12+ while randint (0 , 1 ) == 0 : # keep flipping tails
13+ flips += 1
14+ flips += 1 # finally flipped heads
15+ else : # otherwise, flipped heads on first flip
16+ while randint (0 , 1 ) == 1 : # keep flipping heads
17+ flips += 1
18+ flips += 1 # finally flipped tails
19+
20+ print (flips / trials )
Original file line number Diff line number Diff line change 1+ # 8.6.2 coin_toss_alternative.py
2+ # Simulate the results of a series of coin tosses and track the results
3+
4+ from random import randint
5+
6+
7+ trials = 100000
8+ flips = 0
9+
10+ for trial in range (1 , trials ):
11+ first_flip = randint (0 , 1 )
12+ flips += 1
13+ while randint (0 , 1 ) == first_flip :
14+ flips += 1
15+ flips += 1
16+
17+ print ("The average number of coin flips was {0}" .format (flips / trials ))
Original file line number Diff line number Diff line change 1+ # 8.6.1 election.py
2+ # Simulate the results of an election using a Monte Carlo simulation
3+
4+ from random import random
5+
6+ total_A_wins = 0
7+ total_B_wins = 0
8+
9+ trials = 100000
10+ for trial in range (0 , trials ):
11+ A_win = 0
12+ B_win = 0
13+ if random () < .87 : # 1st region
14+ A_win += 1
15+ else :
16+ B_win += 1
17+ if random () < .65 : # 2nd region
18+ A_win += 1
19+ else :
20+ B_win += 1
21+ if random () < .17 : # 3rd region
22+ A_win += 1
23+ else :
24+ B_win += 1
25+ # determine overall election outcome
26+ if A_win > B_win :
27+ total_A_wins += 1
28+ else :
29+ total_B_wins += 1
30+
31+ print ("Probability A wins:" , total_A_wins / trials )
32+ print ("Probability B wins:" , total_B_wins / trials )
Original file line number Diff line number Diff line change 1+ # 8.3 factors.py
2+ # display all the factors of a number chosen by the user
3+
4+ num = int (input ("Enter a positive integer: " ))
5+ for divisor in range (1 , num + 1 ):
6+ if num % divisor == 0 :
7+ print ("{} is a divisor of {}" .format (divisor , num ))
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