本文实例讲述了python开发中range()函数用法。分享给大家供大家参考,具体如下:
python中的range()函数的功能很强大,所以我觉得很有必要和大家分享一下
就好像其API中所描述的:
If you do need to iterate over a sequence of numbers, the built-in function range() comes in handy. It generates arithmetic progressions
下面是我做的demo:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
|
#如果你需要遍历一个数字序列,可以是使用python中内建的函数range()
#如下面要遍历一个列表test_list
test_list = [ 1 , 3 , 4 , 'Hongten' , 3 , 6 , 23 , 'hello' , 2 ]
for i in range ( len (test_list)):
print (test_list[i],end = ',' )
print ()
print ( '#####################################' )
#或者用range()函数生成一个列表
for i in range ( 5 ):
print (i,end = ',' )
print ()
print ( '#####################################' )
#python中的内置函数range(10),其中参数'10'代表:从0到10的一个序列
#即长度为10的一个序列
print ( 'range(10)表示:' , range ( 10 ))
listA = [i for i in range ( 10 )]
print (listA)
print ( '#####################################' )
#当然,我们可以自定义我们需要的起始点和结束点
#我们定义了一个从5开始的起始点,到100结束的结束点
print ( 'range(5,100)表示:' , range ( 5 , 100 ))
listB = [i for i in range ( 5 , 100 )]
print (listB)
print ( '#####################################' )
#定义了这些后,我们还可以定义步长
#下面我们定义一个从1开始到30结束,步长为3的列表
print ( 'range(1,30,3)表示:' , range ( 1 , 30 , 3 ))
listC = [i for i in range ( 1 , 30 , 3 )]
print (listC)
|
运行效果:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
|
Python 3.3 . 2 (v3. 3.2 :d047928ae3f6, May 16 2013 , 00 : 03 : 43 ) [MSC v. 1600 32 bit (Intel)] on win32
Type "copyright" , "credits" or "license()" for more information.
>>> = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = RESTART = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
>>>
1 , 3 , 4 ,Hongten, 3 , 6 , 23 ,hello, 2 ,
#####################################
0 , 1 , 2 , 3 , 4 ,
#####################################
range ( 10 )表示: range ( 0 , 10 )
[ 0 , 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ]
#####################################
range ( 5 , 100 )表示: range ( 5 , 100 )
[ 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 , 84 , 85 , 86 , 87 , 88 , 89 , 90 , 91 , 92 , 93 , 94 , 95 , 96 , 97 , 98 , 99 ]
#####################################
range ( 1 , 30 , 3 )表示: range ( 1 , 30 , 3 )
[ 1 , 4 , 7 , 10 , 13 , 16 , 19 , 22 , 25 , 28 ]
>>>
|
希望本文所述对大家Python程序设计有所帮助。