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But the problem is not with naming of my modules/packages
(part about relative import of modules I do understand, of
course), but with script naming.

For example consider script:

  #!/usr/bin/python
   import email
   print 1

And name the script email.py, then run it, please. Python
tries to be too smart (IMHO) and variable sys.path is
polluted with directory of email.py script, therefore
standard email Python package will not be imported.