小甲鱼python课后题简书_【Python爬虫】-笨办法学 Python 习题01-10

一、作业内容：

01、将下面的内容写到一个文件中，取名为ex1.py。这个命名方式很重要，Python文件最好以.py结尾。

1 print "Hello World!"

2 print”Hello Again"

3 print"I like typing this."

4 print"This is fun."

5 print"Yay! Printing."

6 print"I'd much rather you 'not'."

7 print"I "said" do not touch this."

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习题2:注释和井号

程序里的注释是很重要的。它们可以用自然语言告诉你某段代码的功能是什么。在你想要临时移除一段。代码时，你还可以用注解的方式将这段代码临时禁用。接下来的练习将让你学会注释:

1 # A comment, this is so you can read your program later.

2 # Anything after the # is ignored by python.

4 print "I could have code like this." # and the comment after is ignored

6 # You can also use a comment to "disable" or comment out a piece of code:

7 # print "This won't run."

9 print "This will run."

习题3:数字和数学计算

有没有注意到以上只是些符号，没有运算操作呢?写完下面的练习代码后，再回到上面的列表，写出每个符号的作用。例如+是用来做加法运算的。

12print "I will now count my chickens:"

3print "Hens", 25 + 30 / 6

4print "Roosters", 100 - 25 * 3 % 4

6print "Now I will count the eggs:"

78print 3 + 2 + 1 - 5 + 4 % 2 - 1 / 4 + 6

9 print "Is it true that 3 + 2 < 5 - 7?"

11 print 3 + 2 < 5 - 7

13 print "What is 3 + 2?", 3 + 2

14 print "What is 5 - 7?", 5 - 7

16 print "Oh, that's why it's False."

18 print "How about some more."

20 print "Is it greater?", 5 > -2

21 print "Is it greater or equal?", 5 >= -2

22 print "Is it less or equal?", 5 <= -2

习题4:变量(variable)和命名

你已经学会了print和算术运算。下一步你要学的是“变量”。在编程中，变量只不过是用来指代某个东西的名字。程序员通过使用变量名可以让他们的程序读起来更像英语。而且因为程序员的记性都不怎么地，变量名可以让他们更容易记住程序的内容。如果他们没有在写程序时使用好的变量名，在下一次读到原来写的代码时他们会大为头疼的。

如果你被这章习题难住了的话，记得我们之前教过的:找到不同点、注意细节。

1.在每一行的上面写一行注解，给自己解释一下这一行的作用。2.倒着读你的.py文件。

3.朗读你的.py文件，将每个字符也朗读出来。

12cars = 100

3space_in_a_car = 4.0

drivers = 30

4passengers = 90

5cars_not_driven = cars - drivers

6cars_driven = drivers

7carpool_capacity = cars_driven * space_in_a_car

8average_passengers_per_car = passengers / cars_driven

10 print "There are", cars, "cars available."

11 print "There are only", drivers, "drivers available."

12 print "There will be", cars_not_driven, "empty cars today."

13 print "We can transport", carpool_capacity, "people today."

14 print "We have", passengers, "to carpool today."

15 print "We need to put about", average_passengers_per_car, "in each car."

习题5:更多的变量和打印

我们现在要键入更多的变量并且把它们打印出来。这次我们将使用一个叫“格式化字符串(format

string)”的东西.每一次你使用"把一些文本引用起来，你就建立了一个字符串。字符串是程序将信息展示给人的方式。你可以打印它们，可以将它们写入文件，还可以将它们发送给网站服务器，很多事情都是通过字符串交流实现的。

字符串是非常好用的东西，所以再这个练习中你将学会如何创建包含变量内容的字符串。使用专门的格式和语法把变量的内容放到字符串里，相当于来告诉python:“嘿，这是一个格式化字符串，把这些

变量放到那几个位置。”

一样的，即使你读不懂这些内容，只要一字不差地键入就可以了。

12my_name = 'Zed A. Shaw'

3my_age = 35 # not a lie

my_height = 74 # inches

4 my_weight = 180 # lbs

5my_eyes = 'Blue'

6my_teeth = 'White'

7my_hair = 'Brown'

8print "Let's talk about %s." % my_name

9print "He's %d inches tall." % my_height

10print "He's %d pounds heavy." % my_weight11print "Actually that's not too heavy."12print "He's got %s eyes and %s hair." % (my_eyes, my_hair)13print "His teeth are usually %s depending on the coffee." % my_teeth

1415# this line is tricky, try to get it exactly right16print "If I add %d, %d, and %d I get %d." % (

17my_age, my_height, my_weight, my_age + my_height + my_weight)

习题6:字符串(string)和文本

12x = "There are %d types of people." % 10

3binary = "binary"

do_not = "don't"

4y = "Those who know %s and those who %s." % (binary, do_not)

6print x

7print y

8print "I said: %r." % x

9 print "I also said: '%s'." % y

11 hilarious = False

12 joke_evaluation = "Isn't that joke so funny?! %r"

14 print joke_evaluation % hilarious

16 w = "This is the left side of..."

17 e = "a string with a right side."

19 print w + e

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习题 7: 更多打印

现在我们将做一批练习，在练习的过程中你需要键入代码，并且让它们运行起来。我不会解释太多，因

为这节的内容都是以前熟悉过的。这节练习的目的是巩固你学到的东西。我们几个练习后再见。不要跳

过这些习题。不要复制粘贴!

你应该看到的结果

$ python ex7.py

Mary had a little lamb.

Its fleece was white as snow.

And everywhere that Mary went.

..........

Cheese Burger

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习题 8: 打印，打印

你应该看到的结果

$ python ex8.py

1 234

'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 didn't sing." 'So I said goodnight.'

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习题 9: 打印，打印，打印

你应该看到的结果

$ python ex9.py

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.

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习题 10: 那是什么?

I'm tabbed in.

I'm split

on a line.

I'm \ a \ cat.

I'll do a list:

* Cat food

* Fishies

* Catnip

* Grass

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习题 11: 提问

How old are you? 35

How tall are you? 6'2"

How much do you weigh? 180lbs

So, you're '35' old, '6\'2"' tall and '180lbs' heavy.

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