Python实战（六）

一实战——恭喜你，可以进行一次考试了

1 ex26.py

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)


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: %d" % 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 good things come to those who wait."

words = break_words(sentence)
sorted_words = sort_words(words)

print_first_word(words)
print_last_word(words)
print_first_word(sorted_words)
print_last_word(sorted_words)
sorted_words = sort_sentence(sentence)
print sorted_words

print_first_and_last(sentence)

print_first_and_last_sorted(sentence)

2 运行结果

PS E:\Python\exercise> python ex26.py
Let's practice everything.
You'd need to know 'bout escapes with \ that do
newlines and    tabs.
--------------

        The lovely world
with logic so firmly planted
cannot discern
the needs of love
nor comprehend passion from intuition
and requires an explantion

                where there is none.

--------------
This should be five: 6
With a starting point of: 10000
We'd have 5000000 jeans, 5000 jars, and 50 crates.
We can also do that this way:
We'd have 500000 beans, 500 jars, and 5 crabapples.
All
wait.
All
who
['All', 'come', 'good', 'things', 'those', 'to', 'wait.', 'who']
All
wait.
All
who

二实战——布尔表达式

1 运行结果

PS E:\Python\exercise> python
Python 2.7.15 (v2.7.15:ca079a3ea3, Apr 30 2018, 16:30:26) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> True and True
True
>>> False and True
False
>>> 1 == 1 and 2 == 1
False
>>> "test" == "test"
True
>>> 1 == 1 or 2 != 1
True
>>> True and 1 == 1
True
>>> False and 0 != 0
False
>>> True or 1 == 1
True
>>> "test" == "testing"
False
>>> 1 != 0 and 2 == 1
False
>>> "test" != "testing"
True
>>> "test" == 1
False
>>> not (True and False)
True
>>> not (1 == 1 and 0 != 1)
False
>>> not (10 == 1 or 1000 == 1000)
False
>>> not (1 != 10 or 3 == 4)
False
>>> not ("testing" == "testing" and "Zed" == "Cool Guy")
True
>>> 1 == 1 and (not ("testing" == 1 or 1 == 0))
True
>>> "chunky" == "bacon" and (not (3 == 4 or 3 == 3))
False
>>> 3 == 3 and (not ("testing" == "testing" or "Python" == "Fun"))
False
>>> False and 1
False
>>> True and 1
1
>>> 1 and True
True
>>> 1 and False
False
>>> "test" and "test"
'test'

三实战——IF 语句

1 ex29.py

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."
if people == dogs:
    print "People are dogs."

2 运行结果

PS E:\Python\exercise> python ex29.py
Too many cats! The world is doomed!
The world is dry!
People are greater than or equal to dogs.
People are less than or equal to dogs.
People are dogs.

四实战——Else 和 If

1 ex30.py

people = 30
cars = 40
trucks = 15
if cars > people:
    print "We should take the cars."
elif cars < people:
    print "We should not take the cars."
else:
    print "We can't decide."
if trucks > cars:
    print "That's too many trucks."
elif trucks < cars:
    print "Maybe we could take the trucks."
else:
    print "We still can't decide."
if people > trucks:
    print "Alright, let's just take the trucks."
else:
    print "Fine, let's stay home then."

2 运行结果

PS E:\Python\exercise> python ex30.py
We should take the cars.
Maybe we could take the trucks.
Alright, let's just take the trucks.

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