习题18

def print_two(*args):
    arg1, arg2 = args
    print("arg1: {0}, arg2: {1}".format(arg1,arg2))
# ok, that *args is actually pointless, we can just do this
def print_two_again(arg1, arg2):
    print("arg1: {0}, arg2: {1}".format(arg1,arg2))
# this just takes one argument
def print_one(arg1):
    print("arg1: {}".format(arg1))
# this one takes no arguments
def print_none():
    print("I got nothin'.")
print_two("Zed","Shaw")
print_two_again("Zed","Shaw")
print_one("First!")
print_none()

习题19

def cheese_and_crackers(cheese_count, boxes_of_crackers):
    print("You have {} cheeses!".format(cheese_count))
    print("You have {} boxes of crackers!".format(boxes_of_crackers))
    print("Man that's enough for a party!")
    print("Get a blanket.\n")
print("We can just give the function numbers directly:")
cheese_and_crackers(20, 30)
print("OR, we can use variables from our script:")
amount_of_cheese = 10
amount_of_crackers = 50
cheese_and_crackers(amount_of_cheese, amount_of_crackers)
print("We can even do math inside too:")
cheese_and_crackers(10 + 20, 5 + 6)
print("And we can combine the two, variables and math:")
cheese_and_crackers(amount_of_cheese + 100, amount_of_crackers + 1000)

习题20

from sys import argv
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())
current_file = open(input_file)
print("First let's print the whole file:\n")
print_all(current_file)
print("Now let's rewind, kind of like a tape.")
rewind(current_file)
print("Let's print three lines:")
current_line = 1
print_a_line(current_line, current_file)
current_line = current_line + 1
print_a_line(current_line, current_file)
current_line = current_line + 1
print_a_line(current_line, current_file)

习题21

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))
    return a / b
print("Let's do some math with just functions!")
age = add(30, 5)
height = subtract(78, 4)
weight = multiply(90, 2)
iq = divide(10,2)
print("Age: %d, Height: %d, Weight: %d, IQ: %d" % (age, height, weight, iq))
# A puzzle for the extra credit, type it in anyway.
print("Here is a puzzle.")
what = add(age, subtract(height, multiply(weight, divide(iq, 2))))
print("That becomes: ", what, "Can you do it by hand?")

习题24

print("Let's practice everything.")
print('You\'d need to know \'bout escapes with \\ that do \n newlines and \t tabs.')
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("--------------")
five = 10 - 2 + 3 - 6
print("This should be five: %s" % five)
def secret_formula(started):
    jelly_beans = started * 500
    jars = jelly_beans / 1000
    crates = jars / 100
    return jelly_beans, jars, crates
start_point = 10000
beans, jars, crates = secret_formula(start_point)
print("With a starting point of: %d" % start_point)
print("We'd have %d beans, %d jars, and %d crates." % (beans, jars, crates))
start_point = start_point / 10
print("We can also do that this way:")
print("We'd have %d beans, %d jars, and %d crates." % secret_formula(start_point))

习题25

def break_words(stuff):
    """This function will break up words for us."""
    words = stuff.split(' ')
    return words
def sort_words(words):
    """Sorts the words."""
    return sorted(words)
def print_first_word(words):
    """Prints the first word after popping it off."""
    word = words.pop(0)
    print(word)
def print_last_word(words):
    """Prints the last word after popping it off."""
    word = words.pop(-1)
    print(word)
def sort_sentence(sentence):
    """Takes in a full sentence and returns the sorted words."""
    words = break_words(sentence)
    return sort_words(words)
def print_first_and_last(sentence):
    """Prints the first and last words of the sentence."""
    words = break_words(sentence)
    print_first_word(words)
    print_last_word(words)
def print_first_and_last_sorted(sentence):
    """Sorts the words then prints the first and last one."""
    words = sort_sentence(sentence)
    print_first_word(words)
    print_last_word(words)

习题26

def break_words(stuff):
    """This function will break up words for us."""
    words = stuff.split(' ')
    return words

def sort_words(words):
    """Sorts the words."""
    return sorted(words)

def print_first_word(words)
    """Prints the first word after popping it off."""
    word = words.poop(0)
    print(word)

def print_last_word(words):
    """Prints the last word after popping it off."""
    word = words.pop(-1)
    print(word)

def sort_sentence(sentence):
    """Takes in a full sentence and returns the sorted words."""
    words = break_words(sentence)
    return sort_words(words)

def print_first_and_last(sentence):
    """Prints the first and last words of the sentence."""
    words = break_words(sentence)
    print_first_word(words)
    print_last_word(words)

def print_first_and_last_sorted(sentence):
    """Sorts the words then prints the first and last one."""
    words = sort_sentence(sentence)
    print_first_word(words)
    print_last_word(words)


print("Let's practice everything.")
print('You\'d need to know \'bout escapes with \\ that do \n newlines and \t tabs.')

poem = """
\tThe lovely world
with logic so firmly planted
cannot discern \n the needs of love
nor comprehend passion from intuition
and requires an explantion
\n\t\twhere there is none.
"""


print("--------------")
print(poem)
print("--------------")

five = 10 - 2 + 3 - 5
print("This should be five: %s" % five)

def secret_formula(started):
    jelly_beans = started * 500
    jars = jelly_beans /1000
    crates = jars / 100
    return jelly_beans, jars, crates


start_point = 10000
beans,jars, crates = secret_formula(start_point)

print("With a starting point of: %d" % start_point)
print("We'd have %d jeans, %d jars, and %d crates." % (beans, jars, crates))

start_point = start_point / 10

print("We can also do that this way:")
print("We'd have %d beans, %d jars, and %d crabapples." % secret_formula(start_point))


sentence = "All god\tthings come to those who weight."

#以下需要导入25题代码
# words = ex25.break_words(sentence)
# sorted_words = ex25.sort_words(words)
# 
# print_first_word(words)
# print_last_word(words)
# .print_first_word(sorted_words)
# print_last_word(sorted_words)
# sorted_words = ex25.sort_sentence(sentence)
# prin(sorted_words)
# 
# print_irst_and_last(sentence)
# 
#    print_first_a_last_sorted(senence)