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aebf706b4e
- file_util.py: operations on single files - dir_util.py: operations on whole directories or directory trees - dep_util.py: simple timestamp-based dependency analysis - archive_util.py: creation of archive (tar, zip, ...) files The functions left in util.py are miscellany that don't fit in any of the new files.
249 lines
7.9 KiB
Python
249 lines
7.9 KiB
Python
"""distutils.file_util
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Utility functions for operating on single files."""
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# created 2000/04/03, Greg Ward (extracted from util.py)
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__revision__ = "$Id$"
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import os
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from distutils.errors import DistutilsFileError
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# for generating verbose output in 'copy_file()'
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_copy_action = { None: 'copying',
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'hard': 'hard linking',
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'sym': 'symbolically linking' }
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def _copy_file_contents (src, dst, buffer_size=16*1024):
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"""Copy the file 'src' to 'dst'; both must be filenames. Any error
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opening either file, reading from 'src', or writing to 'dst',
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raises DistutilsFileError. Data is read/written in chunks of
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'buffer_size' bytes (default 16k). No attempt is made to handle
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anything apart from regular files."""
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# Stolen from shutil module in the standard library, but with
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# custom error-handling added.
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fsrc = None
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fdst = None
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try:
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try:
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fsrc = open(src, 'rb')
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except os.error, (errno, errstr):
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raise DistutilsFileError, \
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"could not open '%s': %s" % (src, errstr)
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try:
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fdst = open(dst, 'wb')
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except os.error, (errno, errstr):
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raise DistutilsFileError, \
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"could not create '%s': %s" % (dst, errstr)
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while 1:
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try:
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buf = fsrc.read (buffer_size)
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except os.error, (errno, errstr):
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raise DistutilsFileError, \
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"could not read from '%s': %s" % (src, errstr)
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if not buf:
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break
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try:
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fdst.write(buf)
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except os.error, (errno, errstr):
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raise DistutilsFileError, \
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"could not write to '%s': %s" % (dst, errstr)
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finally:
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if fdst:
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fdst.close()
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if fsrc:
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fsrc.close()
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# _copy_file_contents()
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def copy_file (src, dst,
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preserve_mode=1,
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preserve_times=1,
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update=0,
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link=None,
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verbose=0,
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dry_run=0):
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"""Copy a file 'src' to 'dst'. If 'dst' is a directory, then 'src'
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is copied there with the same name; otherwise, it must be a
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filename. (If the file exists, it will be ruthlessly clobbered.)
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If 'preserve_mode' is true (the default), the file's mode (type
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and permission bits, or whatever is analogous on the current
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platform) is copied. If 'preserve_times' is true (the default),
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the last-modified and last-access times are copied as well. If
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'update' is true, 'src' will only be copied if 'dst' does not
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exist, or if 'dst' does exist but is older than 'src'. If
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'verbose' is true, then a one-line summary of the copy will be
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printed to stdout.
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'link' allows you to make hard links (os.link) or symbolic links
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(os.symlink) instead of copying: set it to "hard" or "sym"; if it
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is None (the default), files are copied. Don't set 'link' on
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systems that don't support it: 'copy_file()' doesn't check if
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hard or symbolic linking is availalble.
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Under Mac OS, uses the native file copy function in macostools;
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on other systems, uses '_copy_file_contents()' to copy file
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contents.
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Return true if the file was copied (or would have been copied),
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false otherwise (ie. 'update' was true and the destination is
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up-to-date)."""
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# XXX if the destination file already exists, we clobber it if
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# copying, but blow up if linking. Hmmm. And I don't know what
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# macostools.copyfile() does. Should definitely be consistent, and
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# should probably blow up if destination exists and we would be
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# changing it (ie. it's not already a hard/soft link to src OR
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# (not update) and (src newer than dst).
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from stat import *
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from distutils.dep_util import newer
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if not os.path.isfile (src):
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raise DistutilsFileError, \
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"can't copy '%s': doesn't exist or not a regular file" % src
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if os.path.isdir (dst):
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dir = dst
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dst = os.path.join (dst, os.path.basename (src))
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else:
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dir = os.path.dirname (dst)
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if update and not newer (src, dst):
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if verbose:
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print "not copying %s (output up-to-date)" % src
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return 0
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try:
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action = _copy_action[link]
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except KeyError:
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raise ValueError, \
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"invalid value '%s' for 'link' argument" % link
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if verbose:
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print "%s %s -> %s" % (action, src, dir)
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if dry_run:
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return 1
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# On a Mac, use the native file copy routine
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if os.name == 'mac':
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import macostools
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try:
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macostools.copy (src, dst, 0, preserve_times)
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except OSError, exc:
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raise DistutilsFileError, \
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"could not copy '%s' to '%s': %s" % (src, dst, exc[-1])
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# If linking (hard or symbolic), use the appropriate system call
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# (Unix only, of course, but that's the caller's responsibility)
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elif link == 'hard':
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if not (os.path.exists (dst) and os.path.samefile (src, dst)):
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os.link (src, dst)
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elif link == 'sym':
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if not (os.path.exists (dst) and os.path.samefile (src, dst)):
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os.symlink (src, dst)
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# Otherwise (non-Mac, not linking), copy the file contents and
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# (optionally) copy the times and mode.
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else:
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_copy_file_contents (src, dst)
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if preserve_mode or preserve_times:
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st = os.stat (src)
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# According to David Ascher <da@ski.org>, utime() should be done
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# before chmod() (at least under NT).
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if preserve_times:
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os.utime (dst, (st[ST_ATIME], st[ST_MTIME]))
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if preserve_mode:
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os.chmod (dst, S_IMODE (st[ST_MODE]))
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return 1
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# copy_file ()
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# XXX I suspect this is Unix-specific -- need porting help!
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def move_file (src, dst,
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verbose=0,
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dry_run=0):
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"""Move a file 'src' to 'dst'. If 'dst' is a directory, the file
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will be moved into it with the same name; otherwise, 'src' is
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just renamed to 'dst'. Return the new full name of the file.
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Handles cross-device moves on Unix using
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'copy_file()'. What about other systems???"""
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from os.path import exists, isfile, isdir, basename, dirname
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if verbose:
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print "moving %s -> %s" % (src, dst)
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if dry_run:
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return dst
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if not isfile (src):
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raise DistutilsFileError, \
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"can't move '%s': not a regular file" % src
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if isdir (dst):
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dst = os.path.join (dst, basename (src))
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elif exists (dst):
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raise DistutilsFileError, \
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"can't move '%s': destination '%s' already exists" % \
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(src, dst)
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if not isdir (dirname (dst)):
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raise DistutilsFileError, \
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"can't move '%s': destination '%s' not a valid path" % \
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(src, dst)
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copy_it = 0
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try:
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os.rename (src, dst)
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except os.error, (num, msg):
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if num == errno.EXDEV:
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copy_it = 1
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else:
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raise DistutilsFileError, \
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"couldn't move '%s' to '%s': %s" % (src, dst, msg)
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if copy_it:
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copy_file (src, dst)
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try:
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os.unlink (src)
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except os.error, (num, msg):
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try:
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os.unlink (dst)
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except os.error:
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pass
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raise DistutilsFileError, \
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("couldn't move '%s' to '%s' by copy/delete: " +
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"delete '%s' failed: %s") % \
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(src, dst, src, msg)
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return dst
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# move_file ()
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def write_file (filename, contents):
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"""Create a file with the specified name and write 'contents' (a
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sequence of strings without line terminators) to it."""
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f = open (filename, "w")
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for line in contents:
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f.write (line + "\n")
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f.close ()
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