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88 lines
2.4 KiB
Python
88 lines
2.4 KiB
Python
6 years ago
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''' Contexts for *with* statement providing temporary directories
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'''
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from __future__ import division, print_function, absolute_import
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import os
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from contextlib import contextmanager
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from shutil import rmtree
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from tempfile import mkdtemp
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@contextmanager
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def tempdir():
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"""Create and return a temporary directory. This has the same
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behavior as mkdtemp but can be used as a context manager.
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Upon exiting the context, the directory and everything contained
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in it are removed.
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Examples
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--------
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>>> import os
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>>> with tempdir() as tmpdir:
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... fname = os.path.join(tmpdir, 'example_file.txt')
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... with open(fname, 'wt') as fobj:
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... _ = fobj.write('a string\\n')
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>>> os.path.exists(tmpdir)
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False
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"""
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d = mkdtemp()
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yield d
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rmtree(d)
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@contextmanager
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def in_tempdir():
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''' Create, return, and change directory to a temporary directory
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Examples
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--------
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>>> import os
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>>> my_cwd = os.getcwd()
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>>> with in_tempdir() as tmpdir:
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... _ = open('test.txt', 'wt').write('some text')
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... assert os.path.isfile('test.txt')
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... assert os.path.isfile(os.path.join(tmpdir, 'test.txt'))
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>>> os.path.exists(tmpdir)
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False
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>>> os.getcwd() == my_cwd
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True
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'''
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pwd = os.getcwd()
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d = mkdtemp()
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os.chdir(d)
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yield d
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os.chdir(pwd)
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rmtree(d)
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@contextmanager
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def in_dir(dir=None):
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""" Change directory to given directory for duration of ``with`` block
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Useful when you want to use `in_tempdir` for the final test, but
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you are still debugging. For example, you may want to do this in the end:
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>>> with in_tempdir() as tmpdir:
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... # do something complicated which might break
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... pass
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But indeed the complicated thing does break, and meanwhile the
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``in_tempdir`` context manager wiped out the directory with the
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temporary files that you wanted for debugging. So, while debugging, you
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replace with something like:
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>>> with in_dir() as tmpdir: # Use working directory by default
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... # do something complicated which might break
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... pass
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You can then look at the temporary file outputs to debug what is happening,
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fix, and finally replace ``in_dir`` with ``in_tempdir`` again.
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"""
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cwd = os.getcwd()
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if dir is None:
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yield cwd
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return
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os.chdir(dir)
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yield dir
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os.chdir(cwd)
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