53 lines
1.4 KiB
Python
53 lines
1.4 KiB
Python
# Copyright (C) 2010 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Utility functions for setup.py file(s)."""
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__author__ = 'tom.h.miller@gmail.com (Tom Miller)'
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import sys
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def is_missing(packages):
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"""Return True if a package can't be imported."""
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retval = True
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sys_path_original = sys.path[:]
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# Remove the current directory from the list of paths to check when
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# importing modules.
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try:
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# Sometimes it's represented by an empty string?
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sys.path.remove('')
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except ValueError:
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import os.path
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try:
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sys.path.remove(os.path.abspath(os.path.curdir))
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except ValueError:
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pass
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if not isinstance(packages, type([])):
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packages = [packages]
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for name in packages:
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try:
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__import__(name)
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retval = False
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except ImportError:
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retval = True
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if retval == False:
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break
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sys.path = sys_path_original
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return retval
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