Changes between Version 6 and Version 7 of Python3Support

Timestamp:

08/11/18 19:44:51 (6 years ago)

Author:

sanjeet

Comment:

Added compatible code table

Python3Support

@@ -370 +370 @@
 }}}
 
+{{{#!th style="background: #ddd"
+'''Label'''
+}}}
+{{{#!th style="background: #ddd"
+'''Python 2'''
+}}}
+{{{#!th style="background: #ddd"
+'''Python 3'''
+}}}
+{{{#!th style="background: #ddd"
+'''Python 2 and 3 compatible solution'''
+}}}
+|-----------------------
+{{{#!td 
+Strings -
+bytes/str/unicode
+}}}
+{{{#!td 
+}}}
+{{{#!td 
+}}}
+{{{#!td 
+{{{
+Use decode and encode functions from grass.script.utils
+}}}
+}}}
+|-----------------------
+{{{#!td 
+String functions
+}}}
+{{{#!td 
+{{{
+String.split
+String.join
+}}}
+}}}
+{{{#!td
+{{{
+"".split(), "".join(" ")
+}}}
+}}}
+{{{#!td 
+Use functions as in Python 3
+}}}
+|-----------------------
+{{{#!td 
+String types
+}}}
+{{{#!td 
+{{{
+Types.StringTypes
+Types.Stringtype
+}}}
+}}}
+{{{#!td
+{{{
+str or unicode
+str
+}}}
+}}}
+{{{#!td 
+Use direct types like str, unicode, bytes as:
+{{{
+if sys.version_info.major == 3:
+    unicode = str
+else:
+    bytes = str
+}}}
+}}}
+|-----------------------
+{{{#!td 
+ps.communicate():
+stdout, stderror
+}}}
+{{{#!td 
+}}}
+{{{#!td
+}}}
+{{{#!td 
+Use decode: 
+{{{
+from grass.script.utils import decode
+
+stdout = decode(stdout)
+stderr = decode(stdout)
+}}}
+}}}
+|-----------------------
+{{{#!td 
+Opening files
+}}}
+{{{#!td
+{{{
+fileName = file(“example.txt”, w)
+}}}
+}}}
+{{{#!td
+{{{
+fileName = open(“example.txt”, w)
+}}}
+}}}
+{{{#!td 
+Replace file() with open() to open files
+}}}
+|-----------------------
+{{{#!td 
+Filter function
+}}}
+{{{#!td
+{{{
+filter(a_function, a_sequence)
+}}}
+Filter returns a list
+}}}
+{{{#!td
+{{{
+filter(a_function, a_sequence)
+}}}
+Filter returns an iterator, not a list
+}}}
+{{{#!td 
+Explicit conversion to list using:
+{{{
+list( filter(a_function, a_sequence) )
+}}}
+}}}
+|-----------------------
+{{{#!td 
+Urlopen proxies
+}}}
+{{{#!td
+}}}
+{{{#!td
+}}}
+{{{#!td 
+Create proxy handler:
+https://docs.python.org/3.0/library/urllib.request.html#urllib.request.ProxyHandler
+
+Read more:
+http://www.diveintopython3.net/porting-code-to-python-3-with-2to3.html#urllib
+}}}
+|-----------------------
+{{{#!td 
+Import errors
+}}}
+{{{#!td
+}}}
+{{{#!td
+}}}
+{{{#!td 
+Use try/except to catch Import errors and deal accordingly
+}}}
+|-----------------------
+{{{#!td 
+Relative Imports
+}}}
+{{{#!td
+{{{
+import example
+from x import y
+}}}
+}}}
+{{{#!td
+{{{
+from . import example
+from .x import y
+}}}
+}}}
+{{{#!td 
+Use period (.) in import calls
+}}}
+|-----------------------
+{{{#!td 
+Dictionary methods
+}}}
+{{{#!td
+{{{
+a_dictionary.keys()
+a_dictionary.items()
+a_dictionary.iterkeys()
+}}}
+}}}
+{{{#!td
+{{{
+list(a_dictionary.keys())
+list(a_dictionary.items())
+iter(a_dictionary.keys())
+}}}
+}}}
+{{{#!td 
+Read more:
+http://www.diveintopython3.net/porting-code-to-python-3-with-2to3.html#dict
+}}}
+|-----------------------
+{{{#!td 
+Other dictionary iterators
+}}}
+{{{#!td
+{{{
+a_dictionary.iterkeys()
+a_dictionary.iteritems()
+a_dictionary.itervalues()
+}}}
+}}}
+{{{#!td
+{{{
+six.iterkeys(a_dictionary)
+six.iteritems(a_dictionary)
+six.itervalues(a_dictionary)
+}}}
+}}}
+{{{#!td 
+Use function from six library
+}}}
+|-----------------------
+{{{#!td 
+Map list
+}}}
+{{{#!td
+{{{
+map(x, y)
+}}}
+Returns list
+}}}
+{{{#!td
+{{{
+map(x,y)
+}}}
+Returns iterator
+}}}
+{{{#!td
+{{{
+list(map(x,y))
+}}}
+Use list to wrap around map
+}}}
+
 === Other recommendations:
 Use .format specifier for the strings and parameters.