Contents
- daysOfWeek.py
- friends.py
- handling_bad_input.py
- pick4num.py
daysOfWeek.py 1/4
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# Example illustrating list operations: concatenation and iteration
# by Sara Sprenkle
weekDays = ["Mon", "Tue", "Wed", "Thu", "Fri"]
weekendDays = ["Sat", "Sun"]
# combine two lists into one
daysOfWeek = weekDays + weekendDays
print("The Days of the Week:")
# iterate through elements of list
for day in daysOfWeek:
print(day)
print("\nAGAIN!")
# iterate through positions of list
for x in range(len(daysOfWeek)):
print(daysOfWeek[x])
print()
# reorganizing days of week to start on a Sunday
daysOfWeek = weekendDays[-1:] + weekDays + weekendDays[:1]
extractWeekend = daysOfWeek[:1] + daysOfWeek[-1:]
print("Extracted weekend: ", extractWeekend)
extractWeekend2 = [daysOfWeek[0], daysOfWeek[-1]]
print("Extracted weekend: ", extractWeekend2)
notExtractedWeekend = daysOfWeek[0] + daysOfWeek[-1]
print("Does not work: ", notExtractedWeekend)
friends.py 2/4
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friends = ["Alice", "Bjorn", "Cayman", "Duanphen", "Esfir", "Farah"]
for name in friends:
print("I know " + name + ".")
print("{:s} is a friend of mine.".format(name))
print("Those are the people I know.")
# alternative
#for pos in range(1, len()):
handling_bad_input.py 3/4
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# Demonstrates a better way to handle multiple bad inputs
# Extra program, not covered in class. Another example to
# help improve your coding skills.
# by Sara Sprenkle
WMIN = 2
WMAX = 80
HMIN = 2
HMAX = 20
WIDTH_INPUT = "Enter a width (" + str(WMIN) + "-" + str(WMAX) + "): "
HEIGHT_INPUT = "Enter a height (" + str(HMIN) + "-" + str(HMAX) + "): "
width = eval(input(WIDTH_INPUT))
height = eval(input(HEIGHT_INPUT))
error = False
errorMessage = "\nError: \n"
# What does the following code do?
# Why do I consider this a better way to handle multiple bad inputs?
if width < WMIN or width > WMAX:
error = True
errorMessage += "\tWidth (" +str(width) + ") is not within range (" + str(WMIN) + "-" + str(WMAX) + ")\n"
if height < HMIN or height > HMAX:
error = True
errorMessage += "\tHeight (" +str(height) + ") is not with range ("+ str(HMIN) + "-" + str(HMAX) + ")\n"
if error:
print(errorMessage)
pick4num.py 4/4
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# Simulate Pick 4 lottery game - selecting ping pong balls at random
# Modified to figure out if the user entered the winning number
# Demonstrates what I consider to be better error handling.
# By CSCI111
from random import *
import sys
# define constants that are easy to change so that our
# program is flexible
NUM_PICKS = 4
MIN_VALUE = 0
MAX_VALUE = 9
NUMFORMAT="####"
pickedNum = input("What is your pick? (Format: " + NUMFORMAT + ") ")
###### handle bad input ######
error = True
errorMessage = "Error:\n"
# Check that user enters a string that contains only numbers
if not pickedNum.isdigit():
errorMessage += "\tYour number must contain only numbers\n"
error = True
# User enters a number that is not four digits long
if len(pickedNum) != NUM_PICKS:
errorMessage += "\tYour number must contain " + str(NUM_PICKS) + " numbers"
error = True
if error:
print(errorMessage)
sys.exit()
# Generate the random number
winningNum = "" # start it as empty
for i in range(NUM_PICKS):
# generate a random number
# add the random number to the previous random number
winningNum += str(randint(MIN_VALUE,MAX_VALUE))
print("The winning Pick 4 lottery number is ", winningNum)
print()
if winningNum == pickedNum:
print("Congratulations! You are very lucky and rich!")
print("We should be friends!")
else:
print("Sorry, you lost.")
Generated by GNU Enscript 1.6.6.