The difference between the xrange () and range () functions in Python is used:

1.range () function:

Function Description: Range ([Start,] stop[, step]), which generates a sequence based on the range specified by start and stop and step set by step.

>>>#The range () function does not support 0 parameters... >>>range () Traceback (most recent call last): File"<stdin>", Line 1,inch<module>Typeerror:range expected at least1arguments, got 0>>>#a range () of a parameter... >>> Range (10) [0,1, 2, 3, 4, 5, 6, 7, 8, 9]>>>#range of two parameters ()... >>> Range (1,20)[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19]>>>#range () function with step... >>> Range (1,20,2)[1, 3, 5, 7, 9, 11, 13, 15, 17, 19]>>>

2.xrange () function:

Function Description: The usage is exactly the same as range, the difference is not an array, but a builder.

>>>#As can be known from the above demonstration, the range () function generates an array "[]" but generates a generator with xrange () .... >>> Xrange (10) xrange (10)>>> List (xrange (10)) [0,1, 2, 3, 4, 5, 6, 7, 8, 9]>>> xrange (1,10) xrange (1, 10)>>> list (xrange (1,10))[1, 2, 3, 4, 5, 6, 7, 8, 9]>>> xrange (1,20,2) xrange (1, 21, 2)>>> list (xrange (1,21,2))[1, 3, 5, 7, 9, 11, 13, 15, 17, 19]>>>#xrange () also does not support 0 parameter calls... >>>xrange () Traceback (most recent): File"<stdin>", Line 1,inch<module>Typeerror:xrange () requires1-3int arguments>>>

From the above example can be known: to generate a large number sequence, with xrange will be better than range performance, because do not need to open a large amount of memory space, these two are basically in the loop when used, can be said to be deferred execution.

 for  in range (1,10): ...      Print   for in xrange (1,10): ...      Print

The results of both outputs are the same, in fact there are many differences, and range generates a list object directly:

 >>> B = Range (0,100)  >>>  Print   type (b)  <type  " list   " >>>> print  Span style= "color: #000000;" > B[0,  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  0, 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 1, 98, 94, 
   
     >>>" "Color: #0000ff;" style=  b[0],b[10
    ]0  10>>> 
   

Xrange does not generate a list directly, but instead returns one of the values for each call:

>>> C = xrange (1,100)print  type (c)'xrange'print  Cxrange (1, +)print c[1],c[2]

So xrange do loop performance better than range, especially when returning very large, try to use Xrange bar, unless you are going to return a list.

Reference Link: http://ciniao.me/article.php?id=17

The difference between the xrange () and range () functions in Python is used: