#!/usr/bin/env python
import ex_name
ex_name.title("ex27: Memorizing Logic")
#Codes in the book (some words may be changed):
#
print """ The Truth Terms:
* and
* or
* not
* != (not equal)
* == (equal)
* >= (greater-than-equal)
* <= (less-than-equal)
* True
* False
"""
print """
"""
#####################################
ex_name.title("ex28: Boolean Practice")
#!/usr/bin/env python
import ex_name
ex_name.title("ex38: Doing Things to Lists")
#Codes in the book (some words may be changed):
#
ten_things = "Apples Oranges Crows Telephone Light Sugar"
print "Wait there's not 10 things in that list, let's fix that."
stuff = ten_things.split(' ')
more_stuff = [
"Day", "Night", "Song", "Frisbee", "Corn", "Banana", "Girl", "Boy"
]
# If < 10 is better idea?
while len(stuff) != 10:
next_one = more_stuff.pop()
print "Adding: ", next_one
stuff.append(next_one)
print "There is %d items now." % len(stuff)
print "There we go: ", stuff
print "Let's do some things with stuff."
print stuff[1] # print the 2nd item
print stuff[-1] # print the last item
print stuff.pop() # pop up the last item
#!/usr/bin/env python
import ex_name
ex_name.title("ex32: Loops and Lists")
#Codes in the book (some words may be changed):
#
the_count = [1, 2, 3, 4, 5]
fruits = ['apples', 'oranges', 'pears', 'apricots']
change = [1, 'pennies', 2, 'dimes', 3, 'quarters']
# this first kind of for-loop goes thru a list.
for number in the_count:
print "This is count %d" % number
# same as above.
for fruit in fruits:
print "A fruit of type: %s" % fruit
# also we can go through mixed lists too
# notice we have to use %r since we dont know what's in it.
for i in change:
print "I got %r" % i
# we can also build lists, first start with an empty one
elements = []
# then use the range function to do 0 to 5 counts
# The range() function only does numbers from the first to the last, not including
# the last. So it stops at two, not three in the above. This turns out to be the most common way
#!/usr/bin/python
import ex_name
ex_name.title("ex21: Functions can return something")
# Using "=" and "return" to set variables to be *a value from a function*.
#Codes in the book (some words may be changed):
#
# Return the result of "a + b" to variable.
# function ==> variable
def add(a, b):
print "ADDING %d + %d" % (a, b)
return a + b
def subtract(a, b):
print "SUBTRACTING %d - %d" % (a, b)
return a - b
def multiply(a, b):
print "MULTIPLYING %d * %d" % (a, b)
return a * b
def divide(a, b):
print "DIVIDING %d / %d" % (a, b)
import ex_name
ex_name.title("ex36: Designing and Debugging")
# My Game.
#!/usr/bin/env python
import ex_name
# ex18: Names, Variables, Code, Functions
ex_name.title("ex18: Names, Variables, Code, Functions")
# Functions do: name pieces of code, take arguments and make mini-scripts (or tiny commands).
#Codes in the book (some words changed):
#
def print_two(*args):
arg1, arg2 = args
print "arg1: %r, arg2: %r" % (arg1, arg2)
def print_two_again(arg1, arg2):
print "arg1: %r, arg2: %r" % (arg1, arg2)
def print_one(arg1):
print "arg1: %r" % arg1
def print_none():
print "I got nothing."
print "* Output of the code in book, try to write your code and run it to get the following output:"
print_two("Hello", "World")
print_two_again("Hello", "Again")
print_one("One")
print_none()
#
#!/usr/bin/env python
import ex_name
ex_name.title("ex34: Accessing Elements of Lists")
#Codes in the book (some words may be changed):
#
animals = ['bear', 'python', 'peacock', 'kangaroo', 'whale', 'platypus']
print "The aninal at 1 is %s." % animals[1]
print "The 3rd animal is %s." % animals[2]
print "The 1st animal is %s." % animals[0]
print "The animal at 3 is %s." % animals[3]
print "The 5th animal is %s." % animals[4]
print "The animal at 2 is %s." % animals[2]
print "The 6th animal is %s." % animals[5]
print "The animal at 4 is %s." % animals[4]
#####
index = ['1st', '2nd', '3rd', '4th', '5th', '6th']
for i in range(0, 6):
print "The %s animal is at %d and is a %s." % (index[i], i, animals[i])
#!/usr/bin/env python
import ex_name
ex_name.title("ex29: What If")
#Codes in the book (some words may be changed):
#
people = 20
cats = 30
dogs = 15
if people < cats:
print "Too many cats! The world is doomed!"
if people > cats:
print "Not many cats! The world is saved!"
if people < dogs:
print "The world is drooled on!"
if people > dogs:
print "The world is dry!"
dogs += 5
if people >= dogs:
print "People are greater than or equal to dogs."
if people <= dogs:
print "People are less than or equal to dogs."
#!/usr/bin/env python
import ex_name
ex_name.title("ex24: More Practice")
#Codes in the book (some words may be changed):
#
print "Let's practice everything."
print 'You\'d need to know \'bout escapes with \\ that do \n newlines and \t tabs.\n'
# how about double quotes
print "how about double quotes:"
print "You\'d need to know \'bout escapes with \\ that do \n newlines and \t tabs.\n"
poem = """
\tThe lovely world
with logic so firmly planted
cannot discern \n the needs of love
nor comprehend passion from intuition
and requires an explanation
\n\t\twhere there is none.
"""
print "--------------"
print poem
print "-" * 14
five = 10 - 2 + 3 - 6
print "This should be five: %s" % five
#!/usr/bin/env python
import ex_name
ex_name.title("ex39: Dictionaries, Oh Lovely Dictionaries")
#Codes in the book (some words may be changed):
#
## creating a mapping of state to abbreviation.
states = {
'Oregon': 'OR',
'Florida': 'FL',
'California': 'CA',
'New York': 'NY',
'Michigan': 'MI',
'Beijing': 'BJ'
}
# create a basic set of states and some cities in them.
cities = {
'CA': 'San Francisco',
'MI': 'Detroit',
'FL': 'Jacksonville',
}
# add some more cities
cities['NY'] = 'New York'
cities['OR'] = 'Portland'
cities['BJ'] = 'Beijing'
# print out some cities
#!/usr/bin/env python
import ex_name
from sys import argv
# ex20: Functions and Files
ex_name.title("ex20: Functions and Files")
#Codes in the book (some words may be changed):
#
script, input_file = argv
def print_all(f):
print f.read()
def rewind(f):
f.seek(0)
def print_a_line(line_count, f):
print line_count, f.readline()
# Open the test file.
current_file = open(input_file)
#
print "* Output of the code in book, try to write code by yourself and run it to get the following output:"
#
#!/usr/bin/env python
import ex_name
ex_name.title("ex35: Branches and Functions")
#Codes in the book (some words may be changed):
#
from sys import exit
def gold_room():
print "This room is full of gold. How much do you take?"
next = raw_input(">")
if "0" in next or "1" in next:
how_much = int(next)
else:
dead("Man, learn to type a number.")
if how_much < 50:
print "Nice, you're not greedy, you win!"
exit(0)
else:
dead("You are greedy bastard!")
def bear_room():
print "There is bear here."
print "The bear has a bunch of honey."
print "The fat bear is in front of another door."
