drop2

This is a command-line program which can be used to clean up futurize-upgraded code that no longer needs to support Python 2.

This program is uses lib2to3 in the Python standard library and all command-line arguments accepted by 2to3 also work with drop2.

Example

Given this file, greet.py:

from __future__ import print_function
from builtins import input
from future import standard_library
standard_library.install_aliases()
name = input("What's your name? ")
print("Hello {name}".format(name=name))

Running drop2 will produce the following output:

$ python drop2 greet.py
RefactoringTool: Refactored greet.py
--- greet.py    (original)
+++ greet.py    (refactored)
@@ -1,6 +1,2 @@
-from __future__ import print_function
-from builtins import input
-from future import standard_library
-standard_library.install_aliases()
 name = input("What's your name? ")
  print("Hello {name}".format(name=name))
RefactoringTool: Files that need to be modified:
RefactoringTool: greet.py

To fix the given files in-place, use the -w argument (just as with futurize).

Fixes

The available fixers can be seen with -l:

$ python drop2 -l
Available transformations for the -f/--fix option:
builtins
future
open
past
standard_library

All of these fixes are enabled by default.

Each of these fixes briefly explained:

• builtins: remove from builtins import ... lines
• future: remove from __future__ import ... lines (based on the same fixer in 2to3)
• open: remove from io import open line
• past: warn about from past.* import ... lines
• standard_library: remove from future import standard_library and standard_library.install_aliases()

To run just particular fixes, use the -f argument. To exclude particular fixes, use the -x argument.

License

This code is provided under the MIT License.