Similarities and differences between xrange and range in Python

These two are basically used at the time of the cycle.  forIinchRange0, -):p rint i forIinchXrange0, -):p rint I the results of both outputs are the same, in fact there are many differences, and range generates a list object directly: a= Range (0, -) print type (a) print aprint a[0], a[1while Xrange does not generate a list directly, it returns one of the values in each call a= Xrange (0, -) print type (a) print aprint a[0], a[1so the performance of Xrange cycle is better than range, especially when the return is very big! Try to use xrange, unless you are going to return a list. 

Range Function Description: Range ([Start,] stop[, step]), generating a sequence based on the range specified by start and stop and step set by step. Range Example:>>> Range (5)     [0,1,2,3,4]     >>> Range (1,5)     [1,2,3,4]     >>> Range (0,6,2)    [0,2,4]xrange Function Description: The usage is exactly the same as range, the difference is not an array, but a builder. xrange Example:>>> xrange (5) xrange (5)    >>> List (xrange (5))    [0,1,2,3,4]    >>> xrange (1,5) xrange (1,5)    >>> List (xrange (1,5))    [1,2,3,4]    >>> xrange (0,6,2) xrange (0,6,2)    >>> List (xrange (0,6,2))    [0,2,4] By the above example: to generate a large number sequence, using xrange will be much better than range performance, because there is no need to open up a large amount of memory space, both of which are basically used in the loop: forIinchRange0, -): Print i forIinchXrange0, -): Print I The results of both outputs are the same, in fact there are many differences, and range generates a list object directly: a= Range (0, -) print type (a) print a print a[0], a[1] Output results:<type'List'>    [0,1,2,3,4,5,6,7,8,9,Ten, One, A, -, -, the, -, -, -, +, -, +, A, at, -, -, -, -, -, in, -, to, +, -, the, *, $,Panax Notoginseng, -, the, +, A, the, +, -, $, $, -, -, the, -,Wuyi, the, -, Wu, -, About, $, -, -, -, A, +, the, -, $, the, the, the, the, -, in, the, the, About, the, the, the, +, -, the,Bayi, the, the, -, -, the, the, the, the, -, the, the, the,94, the, the, the,98, About]    0 1The xrange does not generate a list directly, but instead returns one of the values for each call: a= Xrange (0, -) print type (a) print a print a[0], a[1] Output results:<type'xrange'>xrange ( -)    0 1so 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. 

Similarities and differences between xrange and range in Python