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77 lines
2.1 KiB
Python
77 lines
2.1 KiB
Python
"""
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Path operations common to more than one OS
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Do not use directly. The OS specific modules import the appropriate
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functions from this module themselves.
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"""
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import os
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import stat
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__all__ = ['commonprefix', 'exists', 'getatime', 'getctime', 'getmtime',
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'getsize', 'isdir', 'isfile']
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# Does a path exist?
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# This is false for dangling symbolic links on systems that support them.
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def exists(path):
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"""Test whether a path exists. Returns False for broken symbolic links"""
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try:
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st = os.stat(path)
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except os.error:
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return False
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return True
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# This follows symbolic links, so both islink() and isdir() can be true
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# for the same path ono systems that support symlinks
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def isfile(path):
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"""Test whether a path is a regular file"""
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try:
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st = os.stat(path)
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except os.error:
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return False
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return stat.S_ISREG(st.st_mode)
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# Is a path a directory?
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# This follows symbolic links, so both islink() and isdir()
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# can be true for the same path on systems that support symlinks
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def isdir(s):
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"""Return true if the pathname refers to an existing directory."""
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try:
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st = os.stat(s)
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except os.error:
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return False
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return stat.S_ISDIR(st.st_mode)
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def getsize(filename):
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"""Return the size of a file, reported by os.stat()."""
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return os.stat(filename).st_size
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def getmtime(filename):
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"""Return the last modification time of a file, reported by os.stat()."""
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return os.stat(filename).st_mtime
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def getatime(filename):
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"""Return the last access time of a file, reported by os.stat()."""
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return os.stat(filename).st_atime
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def getctime(filename):
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"""Return the metadata change time of a file, reported by os.stat()."""
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return os.stat(filename).st_ctime
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# Return the longest prefix of all list elements.
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def commonprefix(m):
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"Given a list of pathnames, returns the longest common leading component"
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if not m: return ''
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s1 = min(m)
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s2 = max(m)
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n = min(len(s1), len(s2))
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for i in xrange(n):
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if s1[i] != s2[i]:
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return s1[:i]
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return s1[:n]
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