Paker
Paker is module for importing Python packages/modules from dictionaries and JSON formatted documents. It was inspired by httpimporter.
Important: Since v0.6.0 paker supports importing .pyd and .dll modules directly from memory. This was achieved by using _memimporter from py2exe project. Importing .so files on Linux still requires writing them to disk.
Installation
From PyPI
pip install paker -U
From source
git clone https://github.com/desty2k/paker.git
cd paker
pip install .
Usage
In Python script
You can import Python modules directly from string, dict or bytes (without disk IO).
import paker
import logging
MODULE = {"somemodule": {"type": "module", "extension": "py", "code": "fun = lambda x: x**2"}}
logging.basicConfig(level=logging.NOTSET)
if __name__ == '__main__':
with paker.loads(MODULE) as loader:
# somemodule will be available only in this context
from somemodule import fun
assert fun(2), 4
assert fun(5), 25
print("6**2 is {}".format(fun(6)))
print("It works!")
To import modules from .json files use load function. In this example paker will serialize and import mss package.
import paker
import logging
file = "mss.json"
logging.basicConfig(level=logging.NOTSET)
# install mss using `pip install mss`
# serialize module
with open(file, "w+") as f:
paker.dump("mss", f, indent=4)
# now you can uninstall mss using `pip uninstall mss -y`
# load package back from dump file
with open(file, "r") as f:
loader = paker.load(f)
import mss
with mss.mss() as sct:
sct.shot()
# remove loader and clean the cache
loader.unload()
try:
# this will throw error
import mss
except ImportError:
print("mss unloaded successfully!")
CLI
Paker can also work as a standalone script. To dump module to JSON dict use dump command:
paker dump mss
To recreate module from JSON dict use load:
paker load mss.json
Show all modules and packages in .json file
paker list mss.json
How it works
When importing modules or packages Python iterates over importers in sys.meta_path and calls find_module method on each object. If the importer returns self, it means that the module can be imported and None means that importer did not find searched package. If any importer has confirmed the ability to import module, Python executes another method on it - load_module. Paker implements its own importer called jsonimporter, which instead of searching for modules in directories, looks for them in Python dictionaries
To dump module or package to JSON document, Paker recursively iterates over modules and creates dict with code and type of each module and submodules if object is package.
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