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| # encoding: utf-8 | |
| """ | |
| Context managers for adding things to sys.path temporarily. | |
| Authors: | |
| * Brian Granger | |
| """ | |
| #----------------------------------------------------------------------------- | |
| # Copyright (C) 2008-2011 The IPython Development Team | |
| # | |
| # Distributed under the terms of the BSD License. The full license is in | |
| # the file COPYING, distributed as part of this software. | |
| #----------------------------------------------------------------------------- | |
| import sys | |
| import warnings | |
| class appended_to_syspath(object): | |
| """ | |
| Deprecated since IPython 8.1, no replacements. | |
| A context for appending a directory to sys.path for a second.""" | |
| def __init__(self, dir): | |
| warnings.warn( | |
| "`appended_to_syspath` is deprecated since IPython 8.1, and has no replacements", | |
| DeprecationWarning, | |
| stacklevel=2, | |
| ) | |
| self.dir = dir | |
| def __enter__(self): | |
| if self.dir not in sys.path: | |
| sys.path.append(self.dir) | |
| self.added = True | |
| else: | |
| self.added = False | |
| def __exit__(self, type, value, traceback): | |
| if self.added: | |
| try: | |
| sys.path.remove(self.dir) | |
| except ValueError: | |
| pass | |
| # Returning False causes any exceptions to be re-raised. | |
| return False | |
| class prepended_to_syspath(object): | |
| """A context for prepending a directory to sys.path for a second.""" | |
| def __init__(self, dir): | |
| self.dir = dir | |
| def __enter__(self): | |
| if self.dir not in sys.path: | |
| sys.path.insert(0,self.dir) | |
| self.added = True | |
| else: | |
| self.added = False | |
| def __exit__(self, type, value, traceback): | |
| if self.added: | |
| try: | |
| sys.path.remove(self.dir) | |
| except ValueError: | |
| pass | |
| # Returning False causes any exceptions to be re-raised. | |
| return False | |