1.变量介绍

变量来源于数学，是计算机语言中能储存计算结果或能表示值的抽象概念，变量可以通过变量名访问，在指令式语言中，变量通常是可变的。

其中Teacher是变量名，zhangzexiang是变量值;

这句话意思是,把变量值zhangzexiang储存在变量名Teacher中。

Teacher="zhangzexiang"

print (Teacher)

2.用变量进行计算

2.1 这个就是第1章 打印输出 第2节 引号规则里面说的给变量名赋值。

a=6

b=4

print(a+b)

2.2 我们也可以将a+b的计算结果用c来代表，最后直接打印输出c。

a=6

b=4

c=a+b

print(c)

2.3 不止是数字，字母也是可以进行变量名赋值的。

a="zhang"

b="zexiang"

print(a+b)

2.4 自增自减

a=7

a=a-1

print (a)

3.大量练习

cars=100 #汽车数量

space_in_a_car=4.0 #汽车空间

drivers=30 #司机数量

passengers=90 #拼车数量

cars_not_driven=cars-drivers #空车数量=汽车数量-司机数量

cars_driven=drivers #汽车驱动=司机数量

carpool_capacity=cars_driven*space_in_a_car #拼车能力=汽车驱动*汽车空间

average_passengers_per_car=passengers/cars_driven #平均每辆车的乘客=拼车数量/汽车驱动

print("There are",cars,"cars available.") #有100辆汽车可用。

print("There are only",drivers,"drivers available.")#目前只有30名司机。

print("There will be",cars_not_driven,"empty cars today.")#今天将有70辆空车。

print("We can transport",carpool_capacity,"people today.")#我们今天可以运送120.0人。

print("We have",passengers ,"to carpool today.")#今天我们有90个拼车。

print("We need to put about",average_passengers_per_car,"in each car")#我们需要在每辆车里装上3.0个座位

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,%d I get %d."%(my_age,my_height,my_weight,my_age+my_height+my_weight))

'''

让我们来讨论一下Zed A.Shaw。

他的74英寸高。

他是180磅重。

实际上，这并不太重。

他有蓝色的眼睛和棕色的头发。

他的牙齿通常是白色的，这取决于咖啡。

如果加35,74,180得到289。

'''

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 #滑稽的

joke_evaluation=("Isn't that joke so funny?! %r ") #笑话评价

print(joke_evaluation%hilarious)

w=("This is the left side of")

e=(" a string with a right side.")

print(w+e)

'''

There are 10 types of people.

Those who know binary and those who don't.

I said: 'There are 10 types of people.'.

I also said:Those who know binary and those who don't..

Isn't that joke so funny?! False

This is the left side of a string with a right side.

有10种类型的人。

知道二进制的和不知道二进制的。

我说:“有10种类型的人。”

我也说过:那些知道二进制和不知道二进制的人。

这个笑话好笑吗?假

这是一个有右侧的弦的左边。

'''

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,end=" ")

print(end7+end8+end9+end10+end11+end12)

'''

Mary had a little lamb.

Its fleece was white as snow.

And everywhere that Mary went.

..........

Cheese Burger

玛丽有只小羊羔。

它的羊毛像雪一样白。

和玛丽去的地方。

..........

奶酪汉堡。

'''

formatter=("%r %r %r %r") #格式器

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 did't sing.",

"So I said goodnight."))

'''

1 2 3 4

'one' 'two' 'three' 'four'

True False False True

'%r %r %r %r' '%r %r %r %r' '%r %r %r %r' '%r %r %r %r'

'I had this thing.' 'That you could type up right.' "But it did't sing." 'So I said goodnight.'

print字符打错了， 字符串换行的时候要加, 与""号。

'''

#Exercise

#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.

Even 4 lines if we want , or 5 , or 6.""")

'''

Here are the days: Mon Tue Wed Thu Fri Sat Sun

Here are the months:

Jan

Feb

Mar

Apr

May

Jun

jul

Aug

There's something going on Here.

With the three double-quotes.

We'll be able to type as much as we like.

Even 4 lines if we want , or 5 , or 6.

现在是这样的日子:Mon Tue Wed Thu Fri Sat Sun

这里是几月:

1月

2月

3月

4月

5月

6月

7月

8月

这里有一些东西。

三个双引号。

我们可以输入我们喜欢的东西。

即使是4行，也可以是5或6。

'''

# Exercise

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*Flishies

\t*Catnip\n\t*Grass

"""

print(tabby_cat)

print(persian_cat)

print(backslash_cat)

print(fat_cat)

'''

I'm tabbed in.

I'm split

on a line.

I'm\a\cat.

I'll do a list:

*Cat food

*Flishies

*Catnip

*Grass

'''