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:
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#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:
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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。