Changes between Version 5 and Version 6 of Python3Support

Timestamp:

Aug 10, 2018, 4:45:09 PM (6 years ago)

Author:

sanjeet

Comment:

Added dictionary difference table

Python3Support

@@ -242 +242 @@
 We already have encode and decode functions available in (from grass.script.utils import encode, decode) lib/python/script/utils.py that makes it easy for us to convert back and forth. To make it work with Python3, made changes in those functions to avoid syntax errors and exceptions.
 
+**Dictionary Differences**
+{{{#!th style="background: #ddd"
+'''Python 2'''
+}}}
+{{{#!th style="background: #ddd"
+'''Python 3'''
+}}}
+|-----------------------
+{{{#!td
+{{{
+>>> d = {'a': 1, b'b': 2, u'c':3}
+
+>>>d['a']
+1
+>>>d[b'a']
+1
+>>>d[u'a']
+1
+
+>>>d['b']
+2
+>>>d[b'b']
+2
+>>>d[u'b']
+2
+
+>>>d['c']
+3
+>>>d[b'c']
+3
+>>>d[u'c']
+3
+}}}
+}}}
+{{{#!td 
+{{{
+>>> d = {'a': 1, b'b': 2, u'c':3}
+
+>>>d['a']
+1
+>>>d[b'a']
+KeyError: b'a'
+>>>d[u'a']
+1
+
+>>>d['b']
+KeyError: 'b'
+>>>d[b'b']
+2
+>>>d[u'b']
+KeyError: 'b'
+
+>>>d['c']
+3
+>>>d[b'c']
+KeyError: b'c'
+>>>d[u'c']
+3
+}}}
+}}}
+|-----------------------
+{{{#!th colspan=2
+When special characters are involved:
+}}}
+|-----------------------
+{{{#!td
+{{{
+>>> d = {'ř': 1, b'š': 2, u'ý':3}
+
+>>>d['ř']
+1
+>>>d[b'ř']
+1
+>>>d[u'ř']
+KeyError: u '\u0159'
+
+>>>d['š']
+1
+>>>d[b'š']
+1
+>>>d[u'š']
+KeyError: u '\u0161'
+
+>>>d['ý']
+KeyError: '\xc3\xbd'
+>>>d[b'ý']
+KeyError: '\xc3\xbd'
+>>>d[u'ý']
+3
+}}}
+}}}
+{{{#!td 
+{{{
+>>> d = {'ř': 1, b's': 2, u'ý':3}
+
+>>>d['ř']
+1
+>>>d[b'ř']
+SyntaxError
+>>>d[u'ř']
+1
+
+>>>d['s']
+KeyError: 's'
+>>>d[b's']
+2
+>>>d[u's']
+KeyError: 's'
+
+>>>d['ý']
+3
+>>>d[b'ý']
+SyntaxError
+>>>d[u'ý']
+3
+}}}
+}}}
+
 == How to write Python 3 compatible code
 To check which Python version is being used, use sys.verson_info like: