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License: MIT License
As reported/discussed in PiDelport/backports.os#10, the presence of an os
module in the backports
package could have consequences for relative imports on Python 2.7. This project should protect from that contingency by using absolute_import
.
Consider this example:
$ mkdir pkg
$ touch pkg/__init__.py
$ cat > pkg/entry.py
from .lib import stuff
__name__ == '__main__' and stuff()
$ cat > pkg/lib.py
def stuff():
print("stuff is done")
$ rwt -q backports.pdb==1.0.1 -- -m backports.pdb -m pkg.entry
> /Users/jaraco/Dropbox/code/public/cpython/test-mod-relative/pkg/entry.py(2)<module>()
-> from .lib import stuff
(Pdb) c
Traceback (most recent call last):
File "/var/folders/c6/v7hnmq453xb6p2dbz1gqc6rr0000gn/T/rwt-8ihufxfn/backports/pdb.py", line 1714, in main
pdb._runmodule(mainpyfile)
File "/var/folders/c6/v7hnmq453xb6p2dbz1gqc6rr0000gn/T/rwt-8ihufxfn/backports/pdb.py", line 1548, in _runmodule
self.run(code)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/bdb.py", line 431, in run
exec(cmd, globals, locals)
File "/Users/jaraco/Dropbox/code/public/cpython/test-mod-relative/pkg/entry.py", line 2, in <module>
from .lib import stuff
ModuleNotFoundError: No module named 'pkg.entry.lib'; 'pkg.entry' is not a package
Uncaught exception. Entering post mortem debugging
Running 'cont' or 'step' will restart the program
> /Users/jaraco/Dropbox/code/public/cpython/test-mod-relative/pkg/entry.py(2)<module>()
-> from .lib import stuff
(Pdb)
It seems that from .lib import stuff
inside pkg.entry
attempts to treat pkg.entry
itself as a package.
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