range()、list与for-一入python深似海

range用法

使用python的人都知道range()函数很方便，今天再用到他的时候发现了很多以前看到过但是忘记的细节。

这里记录一下：

range(1,5)#代表从1到5(不包含5)
[1,2,3,4]
range(1,5,2)#代表从1到5，间隔2(不包含5)
[1,3]
range(5)#代表从0到5(不包含5)
[0,1,2,3,4]

再看看list的操作:

array= [1,2,5,3,6,8,4]
#其实这里的顺序标识是
[1,2,5,3,6,8,4]
(0，1，2，3，4，5，6)
(-7,-6,-5,-4,-3,-2,-1)
 
array[0:]#列出0以后的
[1,2,5,3,6,8,4]
array[1:]#列出1以后的
[2,5,3,6,8,4]
array[:-1]#列出-1之前的
[1,2,5,3,6,8]
array[3:-3]#列出3到-3之间的
[3]
for loopthe_count = [1, 2, 3, 4, 5]
fruits = ["apples", "oranges", "pears", "apricots"]

change = [1, "pennies", 2, "dimes", 3, "quarters"]
for i in elements:
print "Element was: %d" % i</pre><br/>输出</div><div><code class="python plain" style="white-space:pre-wrap; margin:0px!important; padding:0px!important; border:0px!important; bottom:auto!important; float:none!important; height:auto!important; left:auto!important; line-height:1.8em!important; outline:0px!important; overflow:visible!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; font-family:Consolas,"Bitstream Vera Sans Mono","Courier New",Courier,monospace!important; min-height:inherit!important"/><pre code_snippet_id="380742" snippet_file_name="blog_20140607_2_157426" name="code" class="python">This is count 1
This is count 2

This is count 3

This is count 4

This is count 5

A fruit of type: apples

A fruit of type: oranges

A fruit of type: pears

A fruit of type: apricots

I got 1

I got "pennies"

I got 2

I got "dimes"

I got 3

I got "quarters"

Adding 0 to the list.

Adding 1 to the list.

Adding 2 to the list.

Adding 3 to the list.

Adding 4 to the list.

Adding 5 to the list.

Element was: 0

Element was: 1

Element was: 2

Element was: 3

Element was: 4

Element was: 5
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