Differences between revisions 1 and 2

Warning:

Starting from version 9.0, the default distributed version of Sage is using Python 3. See Python3-Switch for more information.

Main caveat

range and xrange

In Python range is a function that return a list.

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   1 sage-8.9: range(5)
   2 [0, 1, 2, 3, 4]
   3 sage-8.9: type(range(5))
   4 <type 'list'>

In Python 3, range is an object that somehow behave as a list (ie elements can still be acessed with square bracket, it has a length, etc) but it is not a list.

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   1 sage-9.0: range(5)
   2 range(0, 5)
   3 sage-9.0: range(5)[2]
   4 2
   5 sage-9.0: range(5)[1::2]
   6 range(1, 5, 2)
   7 sage-9.0: type(range(5))
   8 <class 'range'>

The iterator xrange is no longer valid in Python 3.

-  ⇤ ← Revision 1 as of 2019-10-31 05:53:22 → 
  Size: 727
  Editor: vdelecroix
  Comment:
+   ← Revision 2 as of 2019-10-31 05:53:55 → ⇥
  Size: 757
  Editor: vdelecroix
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 11:
-sage: type(range(5))
+sage-8.9: type(range(5))
 Line 15:
-{{{
+{{{#!highlight python
 Line 20:
-sage: range(5)[1::2]
+sage-9.0: range(5)[1::2]
 Line 22:
-sage: type(range(5))
+sage-9.0: type(range(5))

Diff for "Python3-user"

Main caveat

range and xrange