Python Lessons 1-11
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# Exercise 1: A Good First Program
print ("Hello World!")
print ("Hello Again")
print ("I like typing this.")
print ("This is fun.")
print ('Yay! Printing.')
print ("I'd much rather you 'not'.")
print ('I "said" do not touch this.')
# Exercise 2: Comments and Pound Characters
# A comment, this is so you can read your program later.
# Anything after the # is ignored by python.
print ("I could have code like this.") # and the comment after is ignored
# You can also use a comment to "disable" or comment out a piece of code:
# print "This won't run."
print ("This will run.")
# Exercise 3: Numbers and Math
print ("I will now count my chickens:")
print ("Hens", 25 + 30 / 6)
print ("Roosters", 100 - 25 * 3 % 4)
print ("Now I will count the eggs:")
print (3 + 2 + 1 - 5 + 4 % 2 - 1 / 4 + 6)
print ("Is it true that 3 + 2 < 5 - 7?")
print (3 + 2 < 5 - 7)
print ("What is 3 + 2?", 3 + 2)
print ("What is 5 - 7?", 5 - 7)
print ("Oh, that's why it's False.")
print ("How about some more.")
print ("Is it greater?", 5 > -2)
print ("Is it greater or equal?", 5 >= -2)
print ("Is it less or equal?", 5 <= -2)
# Exercise 4: Variables And Names
cars = 100
space_in_a_car = 4.0
drivers = 30
passengers = 90
cars_not_driven = cars - drivers
cars_driven = drivers
carpool_capacity = cars_driven * space_in_a_car
average_passengers_per_car = passengers / cars_driven
print ("There are", cars, "cars available.")
print ("There are only", drivers, "drivers available.")
print ("There will be", cars_not_driven, "empty cars today.")
print ("We can transport", carpool_capacity, "people today.")
print ("We have", passengers, "to carpool today.")
print ("We need to put about", average_passengers_per_car, "in each car.")
# Exercise 5: More Variables and Printing
my_name = 'Zed A. Shaw'
my_age = 35 # not a lie
my_height = 74 # inches
my_weight = 180 # lbs
my_eyes = 'Blue'
my_teeth = 'White'
my_hair = 'Brown'
print ("Let's talk about %s." % my_name)
print ("He's %d inches tall." % my_height)
print ("He's %d pounds heavy." % my_weight)
print ("Actually that's not too heavy.")
print ("He's got %s eyes and %s hair." % (my_eyes, my_hair))
print ("His teeth are usually %s depending on the coffee." % my_teeth)
# this line is tricky, try to get it exactly right
print ("If I add %d, %d, and %d I get %d." % (
my_age, my_height, my_weight, my_age + my_height + my_weight))
# Exercise 6: Strings and Text
x = "There are %d types of people." % 10
binary = "binary"
do_not = "don't"
y = "Those who know %s and those who %s." % (binary, do_not)
print (x)
print (y)
print ("I said: %r." % x)
print ("I also said: '%s'." % y)
hilarious = False
joke_evaluation = "Isn't that joke so funny?! %r"
print (joke_evaluation % hilarious)
w = "This is the left side of..."
e = "a string with a right side."
print (w + e)
# Exercise 7: More Printing
print ("Mary had a little lamb.")
print ("Its fleece was white as %s." % 'snow')
print ("And everywhere that Mary went.")
print ("." * 10) # what'd that do?
end1 = "C"
end2 = "h"
end3 = "e"
end4 = "e"
end5 = "s"
end6 = "e"
end7 = "B"
end8 = "u"
end9 = "r"
end10 = "g"
end11 = "e"
end12 = "r"
# watch that comma at the end. try removing it to see what happens
print (end1 + end2 + end3 + end4 + end5 + end6)
print (end7 + end8 + end9 + end10 + end11 + end12)
# Exercise 8: Printing, Printing
formatter = "%r %r %r %r"
print (formatter % (1, 2, 3, 4))
print (formatter % ("one", "two", "three", "four"))
print (formatter % (True, False, False, True))
print (formatter % (formatter, formatter, formatter, formatter))
print (formatter % (
"I had this thing.",
"That you could type up right.",
"But it didn't sing.",
"So I said goodnight."
))
# Exercise 9: Printing, Printing, Printing
# Here's some new strange stuff, remember type it exactly.
days = "Mon Tue Wed Thu Fri Sat Sun"
months = "Jan\nFeb\nMar\nApr\nMay\nJun\nJul\nAug"
print ("Here are the days: ", days)
print ("Here are the months: ", months)
print ("""
There's something going on here.
With the three double-quotes
We'll be able to type as much as we like.
""")
# Exercise 10: What Was That?
tabby_cat = "\tI'm tabbed in."
persian_cat = "I'm split\non a line."
backslash_cat = "I'm \\ a \\ cat."
fat_cat = """
I'll do a list:
\t* Cat food
\t* Fishies
\t* Catnip\n\t* Grass
"""
print (tabby_cat)
print (persian_cat)
print (backslash_cat)
print (fat_cat)
# Exercise 11: Asking Questions
age = input("How old are you?\n")
height = input("How tall are you?\n")
weight = input("How much do you weigh?\n")
print ("So, you're %r years old, %r cms tall and %r kg heavy." % (
age, height, weight))
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