New in version 3.5.
Source code: Lib/zipapp.py
This module provides tools to manage the creation of zip files containing Python code, which can be executed directly by the Python interpreter. The module provides both a Command-Line Interface and a Python API.
The following example shows how the Command-Line Interface
can be used to create an executable archive from a directory containing
Python code. When run, the archive will execute the
main function from
myapp in the archive.
$ python -m zipapp myapp -m "myapp:main"
$ python myapp.pyz
<output from myapp>
When called as a program from the command line, the following form is used:
$ python -m zipapp source [options]
If source is a directory, this will create an archive from the contents of source. If source is a file, it should be an archive, and it will be copied to the target archive (or the contents of its shebang line will be displayed if the –info option is specified).
The following options are understood:
- -o <output>, --output=<output>¶
Write the output to a file named output. If this option is not specified, the output filename will be the same as the input source, with the extension
.pyzadded. If an explicit filename is given, it is used as is (so a
.pyzextension should be included if required).
An output filename must be specified if the source is an archive (and in that case, output must not be the same as source).
- -p <interpreter>, --python=<interpreter>¶
#!line to the archive specifying interpreter as the command to run. Also, on POSIX, make the archive executable. The default is to write no
#!line, and not make the file executable.
- -m <mainfn>, --main=<mainfn>¶
__main__.pyfile to the archive that executes mainfn. The mainfn argument should have the form “pkg.mod:fn”, where “pkg.mod” is a package/module in the archive, and “fn” is a callable in the given module. The
__main__.pyfile will execute that callable.
--maincannot be specified when copying an archive.
- -c, --compress¶
Compress files with the deflate method, reducing the size of the output file. By default, files are stored uncompressed in the archive.
--compresshas no effect when copying an archive.
New in version 3.7.
Display the interpreter embedded in the archive, for diagnostic purposes. In this case, any other options are ignored and SOURCE must be an archive, not a directory.
- -h, --help¶
Print a short usage message and exit.
The module defines two convenience functions:
- zipapp.create_archive(source, target=None, interpreter=None, main=None, filter=None, compressed=False)¶
Create an application archive from source. The source can be any of the following:
The name of a directory, or a path-like object referring to a directory, in which case a new application archive will be created from the content of that directory.
The name of an existing application archive file, or a path-like object referring to such a file, in which case the file is copied to the target (modifying it to reflect the value given for the interpreter argument). The file name should include the
.pyzextension, if required.
A file object open for reading in bytes mode. The content of the file should be an application archive, and the file object is assumed to be positioned at the start of the archive.
The target argument determines where the resulting archive will be written:
If it is the name of a file, or a path-like object, the archive will be written to that file.
If it is an open file object, the archive will be written to that file object, which must be open for writing in bytes mode.
If the target is omitted (or
None), the source must be a directory and the target will be a file with the same name as the source, with a
The interpreter argument specifies the name of the Python interpreter with which the archive will be executed. It is written as a “shebang” line at the start of the archive. On POSIX, this will be interpreted by the OS, and on Windows it will be handled by the Python launcher. Omitting the interpreter results in no shebang line being written. If an interpreter is specified, and the target is a filename, the executable bit of the target file will be set.
The main argument specifies the name of a callable which will be used as the main program for the archive. It can only be specified if the source is a directory, and the source does not already contain a
__main__.pyfile. The main argument should take the form “pkg.module:callable” and the archive will be run by importing “pkg.module” and executing the given callable with no arguments. It is an error to omit main if the source is a directory and does not contain a
__main__.pyfile, as otherwise the resulting archive would not be executable.
The optional filter argument specifies a callback function that is passed a Path object representing the path to the file being added (relative to the source directory). It should return
Trueif the file is to be added.
The optional compressed argument determines whether files are compressed. If set to
True, files in the archive are compressed with the deflate method; otherwise, files are stored uncompressed. This argument has no effect when copying an existing archive.
If a file object is specified for source or target, it is the caller’s responsibility to close it after calling create_archive.
When copying an existing archive, file objects supplied only need
writemethods. When creating an archive from a directory, if the target is a file object it will be passed to the
zipfile.ZipFileclass, and must supply the methods needed by that class.
Changed in version 3.7: Added the filter and compressed parameters.
Pack up a directory into an archive, and run it.
$ python -m zipapp myapp
$ python myapp.pyz
<output from myapp>
The same can be done using the
>>> import zipapp
>>> zipapp.create_archive('myapp', 'myapp.pyz')
To make the application directly executable on POSIX, specify an interpreter to use.
$ python -m zipapp myapp -p "/usr/bin/env python"
<output from myapp>
To replace the shebang line on an existing archive, create a modified archive
>>> import zipapp
>>> zipapp.create_archive('old_archive.pyz', 'new_archive.pyz', '/usr/bin/python3')
To update the file in place, do the replacement in memory using a
object, and then overwrite the source afterwards. Note that there is a risk
when overwriting a file in place that an error will result in the loss of
the original file. This code does not protect against such errors, but
production code should do so. Also, this method will only work if the archive
fits in memory:
>>> import zipapp
>>> import io
>>> temp = io.BytesIO()
>>> zipapp.create_archive('myapp.pyz', temp, '/usr/bin/python2')
>>> with open('myapp.pyz', 'wb') as f:
Specifying the Interpreter¶
Note that if you specify an interpreter and then distribute your application
archive, you need to ensure that the interpreter used is portable. The Python
launcher for Windows supports most common forms of POSIX
#! line, but there
are other issues to consider:
If you use “/usr/bin/env python” (or other forms of the “python” command, such as “/usr/bin/python”), you need to consider that your users may have either Python 2 or Python 3 as their default, and write your code to work under both versions.
If you use an explicit version, for example “/usr/bin/env python3” your application will not work for users who do not have that version. (This may be what you want if you have not made your code Python 2 compatible).
There is no way to say “python X.Y or later”, so be careful of using an exact version like “/usr/bin/env python3.4” as you will need to change your shebang line for users of Python 3.5, for example.
Typically, you should use an “/usr/bin/env python2” or “/usr/bin/env python3”, depending on whether your code is written for Python 2 or 3.
Creating Standalone Applications with zipapp¶
zipapp module, it is possible to create self-contained Python
programs, which can be distributed to end users who only need to have a
suitable version of Python installed on their system. The key to doing this
is to bundle all of the application’s dependencies into the archive, along
with the application code.
The steps to create a standalone archive are as follows:
Create your application in a directory as normal, so you have a
myappdirectory containing a
__main__.pyfile, and any supporting application code.
Install all of your application’s dependencies into the
myappdirectory, using pip:
$ python -m pip install -r requirements.txt --target myapp
(this assumes you have your project requirements in a
requirements.txtfile - if not, you can just list the dependencies manually on the pip command line).
Package the application using:
$ python -m zipapp -p "interpreter" myapp
This will produce a standalone executable, which can be run on any machine with the appropriate interpreter available. See Specifying the Interpreter for details. It can be shipped to users as a single file.
On Unix, the
myapp.pyz file is executable as it stands. You can rename the
file to remove the
.pyz extension if you prefer a “plain” command name. On
myapp.pyz[w] file is executable by virtue of the fact that
the Python interpreter registers the
.pyzw file extensions
If your application depends on a package that includes a C extension, that
package cannot be run from a zip file (this is an OS limitation, as executable
code must be present in the filesystem for the OS loader to load it). In this
case, you can exclude that dependency from the zipfile, and either require
your users to have it installed, or ship it alongside your zipfile and add code
__main__.py to include the directory containing the unzipped
sys.path. In this case, you will need to make sure to ship
appropriate binaries for your target architecture(s) (and potentially pick the
correct version to add to
sys.path at runtime, based on the user’s machine).
The Python Zip Application Archive Format¶
Python has been able to execute zip files which contain a
since version 2.6. In order to be executed by Python, an application archive
simply has to be a standard zip file containing a
__main__.py file which
will be run as the entry point for the application. As usual for any Python
script, the parent of the script (in this case the zip file) will be placed on
sys.path and thus further modules can be imported from the zip file.
The zip file format allows arbitrary data to be prepended to a zip file. The
zip application format uses this ability to prepend a standard POSIX “shebang”
line to the file (
Formally, the Python zip application format is therefore:
An optional shebang line, containing the characters
b'#!'followed by an interpreter name, and then a newline (
b'\n') character. The interpreter name can be anything acceptable to the OS “shebang” processing, or the Python launcher on Windows. The interpreter should be encoded in UTF-8 on Windows, and in
Standard zipfile data, as generated by the
zipfilemodule. The zipfile content must include a file called
__main__.py(which must be in the “root” of the zipfile - i.e., it cannot be in a subdirectory). The zipfile data can be compressed or uncompressed.
If an application archive has a shebang line, it may have the executable bit set on POSIX systems, to allow it to be executed directly.
There is no requirement that the tools in this module are used to create application archives - the module is a convenience, but archives in the above format created by any means are acceptable to Python.