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54 lines
1.3 KiB
Python
54 lines
1.3 KiB
Python
import os
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import sys
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from contextlib import contextmanager
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def exists_case_sensitive(path):
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"""
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Returns if the given path exists and also matches the case on Windows.
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When finding files that can be imported, it is important for the cases to match because while
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file os.path.exists("module.py") and os.path.exists("MODULE.py") both return True on Windows, Python
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can only import using the case of the real file.
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"""
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result = os.path.exists(path)
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if (sys.platform.startswith('win') or sys.platform == 'darwin') and result:
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directory, basename = os.path.split(path)
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result = basename in os.listdir(directory)
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return result
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@contextmanager
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def chdir(path):
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"""Context manager for changing dir and restoring previous workdir after exit.
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"""
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curdir = os.getcwd()
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os.chdir(path)
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try:
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yield
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finally:
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os.chdir(curdir)
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def union(a, b):
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""" Return a list of items that are in `a` or `b`
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"""
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u = []
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for item in a:
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if item not in u:
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u.append(item)
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for item in b:
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if item not in u:
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u.append(item)
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return u
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def difference(a, b):
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""" Return a list of items from `a` that are not in `b`.
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"""
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d = []
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for item in a:
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if item not in b:
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d.append(item)
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return d
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