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# pyfakefs Release Notes
The release versions are PyPi releases.
## [Version 3.5.8](https://pypi.python.org/pypi/pyfakefs/3.5.8)
Another bug-fix release that mainly fixes a regression wih Python 2 that has
been introduced in version 3.5.3.
#### Fixes
* regression: patching build-in `open` under Python 2 broke unit tests
(see [#469](../../issues/469))
* fixed writing to file added with `add_real_file`
(see [#470](../../issues/470))
* fixed argument name of `FakeIOModule.open` (see [#471](../../pull/471))
#### Infrastructure
* more changes to run tests using `python setup.py test` under Python 2
regardless of `pathlib2` presence
## [Version 3.5.7](https://pypi.python.org/pypi/pyfakefs/3.5.7)
This is mostly a bug-fix release.
#### Fixes
* regression: `pathlib` did not get patched in the presence of `pathlib2`
(see [#467](../../issues/467))
* fixed errors if running the PyCharm debugger under Python 2
(see [#464](../../issues/464))
#### Infrastructure
* do not run real file system tests by default (fixes deployment problem,
see [#465](../../issues/465))
* make tests run if running `python setup.py test` under Python 2
## [Version 3.5.6](https://pypi.python.org/pypi/pyfakefs/3.5.6)
#### Changes
* import external `pathlib2` and `scandir` packages first if present
(see [#462](../../issues/462))
## [Version 3.5.5](https://pypi.python.org/pypi/pyfakefs/3.5.5)
#### Fixes
* removed shebang from test files to avoid packaging warnings
(see [#461](../../issues/461))
## [Version 3.5.4](https://pypi.python.org/pypi/pyfakefs/3.5.4)
#### New Features
* added context manager class `Pause` for pause/resume
(see [#448](../../issues/448))
#### Fixes
* fixed `AttributeError` shown while displaying `fs` in a failing pytest
in Python 2
* fixed permission handling for root user
* avoid `AttributeError` triggered by modules without `__module__` attribute
(see [#460](../../issues/460))
## [Version 3.5.3](https://pypi.python.org/pypi/pyfakefs/3.5.3)
This is a minor release to have a version with passing tests for OpenSUSE
packaging.
#### New Features
* automatically patch file system methods imported as another name like
`from os.path import exists as my_exists`, including builtin `open`
and `io.open`
#### Fixes
* make tests for access time less strict to account for file systems that
do not change it immediately ([#453](../../issues/453))
## [Version 3.5.2](https://pypi.python.org/pypi/pyfakefs/3.5.2)
This is mostly a bug-fix release.
#### New Features
* added support for pause/resume of patching the file system modules
([#448](../../issues/448))
* allow to set current group ID, set current user ID and group ID as
`st_uid` and `st_gid` in new files ([#449](../../issues/449))
#### Fixes
* fixed using `modules_to_patch` (regression, see [#450](../../issues/450))
* fixed recursion error on unpickling the fake file system
([#445](../../issues/445))
* allow trailing path in `add_real_directory` ([#446](../../issues/446))
## [Version 3.5](https://pypi.python.org/pypi/pyfakefs/3.5)
#### Changes
* This version of pyfakefs does not support Python 3.3. Python 3.3 users
must keep using pyfakefs 3.4.3, or upgrade to a newer Python version.
* The deprecation warnings for the old API are now switched on by default.
To switch them off for legacy code, use:
```python
from pyfakefs.deprecator import Deprecator
Deprecator.show_warnings = False
```
#### New Features
* Improved automatic patching:
* automatically patch methods of a patched file system module imported like
`from os.path import exists` ([#443](../../pull/443))
* a module imported as another name (`import os as _os`) is now correctly
patched without the need of additional parameters
([#434](../../pull/434))
* automatically patch `Path` if imported like `from pathlib import Path`
([#440](../../issues/440))
* parameter `patch_path` has been removed from `UnitTest` and `Patcher`,
the correct patching of `path` imports is now done automatically
([#429](../../pull/429))
* `UnitTest` /`Patcher` arguments can now also be set in `setUpPyfakefs()`
([#430](../../pull/430))
* added possibility to set user ID ([#431](../../issues/431))
* added side_effect option to fake files ([#433](../../pull/433))
* added some support for extended filesystem attributes under Linux
([#423](../../issues/423))
* handle `contents=None` in `create_file()` as empty contents if size not
set ([#424](../../issues/424))
* added `pathlib2` support ([#408](../../issues/408)) ([#422](../../issues/422))
* added support for null device ([#418](../../issues/418))
* improved error message for "Bad file descriptor in fake filesystem"
([#419](../../issues/419))
#### Fixes
* fixed pytest when both pyfakefs and future are installed
([#441](../../issues/441))
* file timestamps are now updated more according to the real behavior
([#435](../../issues/435))
* fixed a problem related to patching `shutil` functions using `zipfile`
([#427](../../issues/427))
## [Version 3.4.3](https://pypi.python.org/pypi/pyfakefs/3.4.3)
This is mostly a bug fix release, mainly for bugs found by
[@agroce](https://github.com/agroce) using [tstl](https://github.com/agroce/tstl).
#### New Features
* added support for path-like objects as arguments in `create_file()`,
`create_dir()`, `create_symlink()`, `add_real_file()` and
`add_real_directory()` (Python >= 3.6, see [#409](../../issues/409))
#### Infrastructure
* moved tests into package
* use README.md in pypi ([#358](../../issues/358))
#### Fixes
* `tell` after `seek` gave incorrect result in append mode
([#363](../../issues/363))
* a failing pytest did not display the test function correctly
([#381](../../issues/381))
* flushing file contents after truncate was incorrect under some conditions
([#412](../../issues/412))
* `readline()` did not work correctly in binary mode
([#411](../../issues/411))
* `pathlib.Path.resolve()` behaved incorrectly if the path does not exist
([#401](../../issues/401))
* `closed` attribute was not implemented in fake file ([#380](../../issues/380))
* `add_real_directory` did not behave correctly for nested paths
* the following functions did not behave correctly for paths ending with a
path separator (found by @agroce using [tstl](https://github.com/agroce/tstl)):
* `os.rename` ([#400](../../issues/400))
* `os.link` ([#399](../../issues/399), [#407](../../issues/407))
* `os.rmdir` ([#398](../../issues/398))
* `os.mkdir`, `os.makedirs` ([#396](../../issues/396))
* `os.rename` ([#391](../../issues/391), [#395](../../issues/395),
[#396](../../issues/396), [#389](../../issues/389),
[#406](../../issues/406))
* `os.symlink` ([#371](../../issues/371), [#390](../../issues/390))
* `os.path.isdir` ([#387](../../issues/387))
* `open` ([#362](../../issues/362), [#369](../../issues/369),
[#397](../../issues/397))
* `os.path.lexists`, `os.path.islink` ([#365](../../issues/365),
[#373](../../issues/373), [#396](../../issues/396))
* `os.remove` ([#360](../../issues/360), [#377](../../issues/377),
[#396](../../issues/396))
* `os.stat` ([#376](../../issues/376))
* `os.path.isfile` ([#374](../../issues/374))
* `os.path.getsize` ([#368](../../issues/368))
* `os.lstat` ([#366](../../issues/366))
* `os.path.exists` ([#364](../../issues/364))
* `os.readlink` ([#359](../../issues/359), [#372](../../issues/372),
[#392](../../issues/392))
## [Version 3.4.1](https://pypi.python.org/pypi/pyfakefs/3.4.1)
This is a bug fix only release.
#### Fixes
* Missing cleanup after using dynamic patcher let to incorrect behavior of
`tempfile` after test execution (regression, see [#356](../../issues/356))
* `add_real_directory` does not work after `chdir` (see [#355](../../issues/355))
## [Version 3.4](https://pypi.python.org/pypi/pyfakefs/3.4)
This version of pyfakefs does not support Python 2.6. Python 2.6 users
must use pyfakefs 3.3 or earlier.
#### New Features
* Added possibility to map real files or directories to another path in
the fake file system (see [#347](../../issues/347))
* Configuration of `Patcher` and `TestCase`:
* Possibility to reload modules is now also available in `Patcher`
* Added possibility to add own fake modules via `modules_to_patch`
argument (see [#345](../../issues/345))
* Dynamic loading of modules after setup is now on by default and no more
considered experimental (see [#340](../../issues/340))
* Added support for file descriptor path parameter in `os.scandir`
(Python >= 3.7, Posix only) (see [#346](../../issues/346))
* Added support to fake out backported `scandir` module ([#332](../../issues/332))
* `IOError`/`OSError` exception messages in the fake file system now always
start with the message issued in the real file system in Unix systems (see [#202](../../issues/202))
#### Infrastructure
* Changed API to be PEP-8 conform ([#186](../../issues/186)). Note: The old
API is still available.
* Removed Python 2.6 support ([#293](../../issues/293))
* Added usage documentation to GitHub Pages
* Added contributing guide
* Added flake8 tests to Travis CI
#### Fixes
* Links in base path in `os.scandir` shall not be resolved ([#350](../../issues/350))
* Fixed unit tests when run on a computer not having umask set to 0022
* Correctly handle newline parameter in `open()` for Python 3, added support for universal newline mode in Python 2 ([#339](../../issues/339))
* Fixed handling of case-changing rename with symlink under MacOS ([#322](../../issues/322))
* Creating a file with a path ending with path separator did not raise ([#320](../../issues/320))
* Fixed more problems related to `flush` ([#302](../../issues/302), [#300](../../issues/300))
* Correctly handle opening files more than once ([#343](../../issues/343))
* Fake `os.lstat()` crashed with several trailing path separators ([#342](../../issues/342))
* Fixed handling of path components starting with a drive letter([#337](../../issues/337))
* Symlinks to absolute paths were incorrectly resolved under Windows ([#341](../../issues/341))
* Unittest mock didn't work after setUpPyfakefs ([#334](../../issues/334))
* `os.path.split()` and `os.path.dirname()` gave incorrect results under Windows ([#335](../../issues/335))
## [Version 3.3](https://pypi.python.org/pypi/pyfakefs/3.3)
This is the last release that supports Python 2.6.
#### New Features
* The OS specific temp directory is now automatically created in `setUp()` (related to [#191](../../issues/191)).
Note that this may break test code that assumes that the fake file system is completely empty at test start.
* Added possibility to reload modules and switch on dynamic loading of modules
after setup (experimental, see [#248](../../issues/248))
* Added possibility to patch modules that import file system modules under
another name, for example `import os as '_os` ([#231](../../issues/231))
* Added support for `dir_fd` argument in several `os` functions
([#206](../../issues/206))
* Added support for open file descriptor as path argument in `os.utime`,
`os.chmod`, `os.chdir`, `os.chown`, `os.listdir`, `os.stat` and `os.lstat`
(Python >= 3.3) ([#205](../../issues/205))
* Added support for basic modes in fake `os.open()` ([#204](../../issues/204))
* Added fake `os.path.samefile` implementation ([#193](../../issues/193))
* Added support for `ns` argument in `os.utime()` (Python >= 3.3)
([#192](../../issues/192))
* Added nanosecond time members in `os.stat_result` (Python >= 3.3)
([#196](../../issues/196))
#### Infrastructure
* Added Travis CI tests for MacOSX (Python 2.7 and 3.6)
* Added Appveyor CI tests for Windows (Python 2.7, 3.3 and 3.6)
* Added auto-generated documentation for development version on GitHub Pages
* Removed most of `fake_filesystem_shutil` implementation, relying on the
patched `os` module instead ([#194](../../issues/194))
* Removed `fake_tempfile` and `fake_filesystem_glob`, relying on the patched
`os` module instead ([#189](../../issues/189), [#191](../../issues/191))
#### Fixes
* Multiple fixes of bugs found using TSTL by @agroce (see about 100 issues
with the `TSTL` label)
* several problems with buffer handling in high-level IO functions
* several problems with multiple handles on the same file
* several problems with low-level IO functions
* incorrect exception (`IOError` vs `OSError`) raised in several cases
* Fake `rename` did not behave like `os.rename` in many cases
* Symlinks have not been considered or incorrectly handled in several
functions
* A nonexistent file that has the same name as the content of the parent
object was seen as existing
* Incorrect error handling during directory creation
* many fixes for OS-specific behavior
* Also patch modules that are loaded between `__init__()` and `setUp()`
([#199](../../issues/199))
* Creating files in read-only directory was possible ([#203](../../issues/203))
## [Version 3.2](https://pypi.python.org/pypi/pyfakefs/3.2)
#### New Features
* The `errors` argument is supported for `io.open()` and `os.open()`
* New methods `add_real_file()`, `add_real_directory()` and `add_real_paths()`
make real files and directories appear within the fake file system.
File contents are read from the real file system only as needed ([#170](../../issues/170)).
See `example_test.py` for a usage example.
* Deprecated `TestCase.copyRealFile()` in favor of `add_real_file()`.
`copyRealFile()` remains only for backward compatability. Also, some
less-popular argument combinations have been disallowed.
* Added this file you are reading, `CHANGES.md`, to the release manifest
#### Infrastructure
* The `mox3` package is no longer a prerequisite--the portion required by pyfakefs
has been integrated into pyfakefs ([#182](../../issues/182))
#### Fixes
* Corrected the handling of byte/unicode paths in several functions ([#187](../../issues/187))
* `FakeShutilModule.rmtree()` failed for directories ending with path separator ([#177](../../issues/177))
* Case was incorrectly handled for added Windows drives
* `pathlib.glob()` incorrectly handled case under MacOS ([#167](../../issues/167))
* tox support was broken ([#163](../../issues/163))
* On Windows it was not possible to rename a file when only the case of the file
name changed ([#160](../../issues/160))
## [Version 3.1](https://pypi.python.org/pypi/pyfakefs/3.1)
#### New Features
* Added helper method `TestCase.copyRealFile()` to copy a file from
the real file system to the fake file system. This makes it easy to use
template, data and configuration files in your tests.
* A pytest plugin is now installed with pyfakefs that exports the
fake filesystem as pytest fixture `fs`.
#### Fixes
* Incorrect disk usage calculation if too large file created ([#155](../../issues/155))
## [Version 3.0](https://pypi.python.org/pypi/pyfakefs/3.0)
#### New Features
* Support for path-like objects as arguments in fake `os`
and `os.path` modules (Python >= 3.6)
* Some changes to make pyfakefs work with Python 3.6
* Added fake `pathlib` module (Python >= 3.4) ([#29](../../issues/29))
* Support for `os.replace` (Python >= 3.3)
* `os.access`, `os.chmod`, `os.chown`, `os.stat`, `os.utime`:
support for `follow_symlinks` argument (Python >= 3.3)
* Support for `os.scandir` (Python >= 3.5) ([#119](../../issues/119))
* Option to not fake modules named `path` ([#53](../../issues/53))
* `glob.glob`, `glob.iglob`: support for `recursive` argument (Python >= 3.5) ([#116](../../issues/116))
* Support for `glob.iglob` ([#59](../../issues/59))
#### Infrastructure
* Added [auto-generated documentation](http://jmcgeheeiv.github.io/pyfakefs/)
#### Fixes
* `shutil.move` incorrectly moves directories ([#145](../../issues/145))
* Missing support for 'x' mode in `open` (Python >= 3.3) ([#147](../../issues/147))
* Incorrect exception type in Posix if path ancestor is a file ([#139](../../issues/139))
* Exception handling when using `Patcher` with py.test ([#135](../../issues/135))
* Fake `os.listdir` returned sorted instead of unsorted entries
## [Version 2.9](https://pypi.python.org/pypi/pyfakefs/2.9)
#### New Features
* `io.open`, `os.open`: support for `encoding` argument ([#120](../../issues/120))
* `os.makedirs`: support for `exist_ok` argument (Python >= 3.2) ([#98](../../issues/98))
* Support for fake `io.open()` ([#70](../../issues/70))
* Support for mount points ([#25](../../issues/25))
* Support for hard links ([#75](../../issues/75))
* Support for float times (mtime, ctime)
* Windows support:
* support for alternative path separator
* support for case-insensitive filesystems ([#69](../../issues/69))
* support for drive letters and UNC paths
* Support for filesystem size ([#86](../../issues/86))
* `shutil.rmtree`: support for `ignore_errors` and `onerror` arguments ([#72](../../issues/72))
* Support for `os.fsync()` and `os.fdatasync()` ([#73](../../issues/73))
* `os.walk`: Support for `followlinks` argument
#### Fixes
* `shutil` functions like `make_archive` do not work with pyfakefs ([#104](../../issues/104))
* File permissions on deletion not correctly handled ([#27](../../issues/27))
* `shutil.copy` error with bytes contents ([#105](../../issues/105))
* mtime and ctime not updated on content changes
## [Version 2.7](https://pypi.python.org/pypi/pyfakefs/2.7)
#### Infrastructure
* Moved repository from GoogleCode to GitHub, merging 3 projects
* Added continuous integration testing with Travis CI
* Added usage documentation in project wiki
* Better support for pypi releases
#### New Features
* Added direct unit test support in `fake_filesystem_unittest`
(transparently patches all calls to faked implementations)
* Added support for doctests
* Added support for cygwin
* Better support for Python 3
#### Fixes
* `os.utime` fails to traverse symlinks ([#49](../../issues/49))
* `chown` incorrectly accepts non-integer uid/gid arguments ([#30](../../issues/30))
* Reading from fake block devices doesn't work ([#24](../../issues/24))
* `fake_tempfile` is using `AddOpenFile` incorrectly ([#23](../../issues/23))
* Incorrect behavior of `relpath`, `abspath` and `normpath` on Windows.
* Cygwin wasn't treated as Windows ([#37](../../issues/37))
* Python 3 `open` in binary mode not working ([#32](../../issues/32))
* `os.remove` doesn't work with relative paths ([#31](../../issues/31))
* `mkstemp` returns no valid file descriptor ([#19](../../issues/19))
* `open` methods lack `IOError` for prohibited operations ([#18](../../issues/18))
* Incorrectly resolved relative path ([#3](../../issues/3))
* `FakeFileOpen` keyword args do not match the `__builtin__` equivalents ([#5](../../issues/5))
* Relative paths not supported ([#16](../../issues/16), [#17](../../issues/17)))
## Older Versions
There are no release notes for releases 2.6 and below. The following versions are still available on PyPi:
* [1.1](https://pypi.python.org/pypi/pyfakefs/1.1), [1.2](https://pypi.python.org/pypi/pyfakefs/1.2), [2.0](https://pypi.python.org/pypi/pyfakefs/2.0), [2.1](https://pypi.python.org/pypi/pyfakefs/2.1), [2.2](https://pypi.python.org/pypi/pyfakefs/2.2), [2.3](https://pypi.python.org/pypi/pyfakefs/2.3) and [2.4](https://pypi.python.org/pypi/pyfakefs/2.4)