allpy: 8b25fa9734c0 allpy/util.py

allpy

Added allpy.utils.lazy_import: a helper to break import loops less pervasively

author	Daniil Alexeyevsky <dendik@kodomo.fbb.msu.ru>
date	Tue, 19 Jul 2011 19:39:59 +0400
parents	7de42d758354
children	88b04c08f539

line source

1 """Miscellanous utilities.

3 import warnings

5 def unzip(seq):

6 """The oppozite of zip() builtin."""

7 a, b = [], []

8 for x, y in seq:

9 a.append(x)

10 b.append(y)

11 return a, b

13 def remove_each(string, substrings):

14 """Remove each of substrings from string."""

15 for sub in substrings:

16 string = string.replace(sub, "")

17 return string

19 class UserDict(dict):

20 """Clone of dict that user may add attributes to."""

21 pass

23 class UserList(list):

24 """Clone of list that user may add attributes to."""

25 pass

27 class UserString(str):

28 """Clone of str that user may add attributes to."""

29 pass

31 def deprecated(message):

32 """Warn about function being deprecated."""

33 warnings.warn(message, DeprecationWarning, stacklevel=2)

35 class lazy_import(object):

36 """Lazy module import to help breaking bad import loops."""

37 def __init__(self, name):

38 self.name = name

39 def __getattr__(self, attr):

40 self.module = __import__(self.name)

41 self.__dict__ = self.module.__dict__

43 # vim: set et ts=4 sts=4 sw=4: