lazy-object-proxy

A fast and thorough lazy object proxy.

Free software: BSD license

Note that this is based on wrapt’s ObjectProxy with one big change: it calls a function the first time the proxy object is used, while wrapt.ObjectProxy just forwards the method calls to the target object.

In other words, you use lazy-object-proxy when you only have the object way later and you use wrapt.ObjectProxy when you want to override few methods (by subclassing) and forward everything else to the target object.

Example:

import lazy_object_proxy

def expensive_func():
    from time import sleep
    print('starting calculation')
    # just as example for a very slow computation
    sleep(2)
    print('finished calculation')
    # return the result of the calculation
    return 10

obj = lazy_object_proxy.Proxy(expensive_func)
# function is called only when object is actually used
print(obj)  # now expensive_func is called

print(obj)  # the result without calling the expensive_func

Installation

pip install lazy-object-proxy

Documentation

https://python-lazy-object-proxy.readthedocs.io/

Development

To run the all tests run:

tox

Acknowledgements

This project is based on some code from wrapt as you can see in the git history.

Changelog

1.4.0 (2019-05-05)

Fixed __mod__ for the slots backend. Contributed by Ran Benita in #28.
Dropped support for Python 2.6 and 3.3. Contributed by “hugovk” in #24.

1.3.1 (2017-05-05)

Fix broken release (sdist had a broken MANIFEST.in).

1.3.0 (2017-05-02)

Speed up arithmetic operations involving cext.Proxy subclasses.

1.2.2 (2016-04-14)

Added manylinux wheels.
Minor cleanup in readme.

1.2.1 (2015-08-18)

Fix a memory leak (the wrapped object would get bogus references). Contributed by Astrum Kuo in #10.

1.2.0 (2015-07-06)

Don’t instantiate the object when __repr__ is called. This aids with debugging (allows one to see exactly in what state the proxy is).

1.1.0 (2015-07-05)

Added support for pickling. The pickled value is going to be the wrapped object without any Proxy container.
Fixed a memory management issue in the C extension (reference cycles weren’t garbage collected due to improper handling in the C extension). Contributed by Alvin Chow in #8.

1.0.2 (2015-04-11)

First release on PyPI.

Metadata

Release files for lazy-object-proxy 1.4.0

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for lazy-object-proxy 1.4.0
File	Size	Uploaded
lazy-object-proxy-1.4.0.tar.gz	33.7 kB	May 7, 2019	Details

Built distributions (wheels)

Table of built distributions (wheels) for lazy-object-proxy 1.4.0
File	Interpreter	ABI	Platform	Reset
lazy_object_proxy-1.4.0-cp37-cp37m-win_amd64.whl 25.1 kB May 7, 2019	CPython 3.7	CPython 3.7 pymalloc	Windows x86-64	Details
lazy_object_proxy-1.4.0-cp37-cp37m-win32.whl 22.8 kB May 7, 2019	CPython 3.7	CPython 3.7 pymalloc	Windows x86-32	Details
lazy_object_proxy-1.4.0-cp37-cp37m-manylinux1_x86_64.whl 54.2 kB May 7, 2019	CPython 3.7	CPython 3.7 pymalloc	Linux glibc 2.5+ x86-64	Details
lazy_object_proxy-1.4.0-cp37-cp37m-macosx_10_13_x86_64.whl 35.8 kB May 7, 2019	CPython 3.7	CPython 3.7 pymalloc	macOS 10.13+ x86-64	Details
lazy_object_proxy-1.4.0-cp36-cp36m-win_amd64.whl 25.1 kB May 7, 2019	CPython 3.6	CPython 3.6 pymalloc	Windows x86-64	Details
lazy_object_proxy-1.4.0-cp36-cp36m-win32.whl 22.9 kB May 7, 2019	CPython 3.6	CPython 3.6 pymalloc	Windows x86-32	Details
lazy_object_proxy-1.4.0-cp36-cp36m-manylinux1_x86_64.whl 54.2 kB May 7, 2019	CPython 3.6	CPython 3.6 pymalloc	Linux glibc 2.5+ x86-64	Details
lazy_object_proxy-1.4.0-cp35-cp35m-win_amd64.whl 25.1 kB May 7, 2019	CPython 3.5	CPython 3.5 pymalloc	Windows x86-64	Details
lazy_object_proxy-1.4.0-cp35-cp35m-win32.whl 22.8 kB May 7, 2019	CPython 3.5	CPython 3.5 pymalloc	Windows x86-32	Details
lazy_object_proxy-1.4.0-cp35-cp35m-manylinux1_x86_64.whl 54.2 kB May 7, 2019	CPython 3.5	CPython 3.5 pymalloc	Linux glibc 2.5+ x86-64	Details
lazy_object_proxy-1.4.0-cp34-cp34m-win_amd64.whl 23.0 kB May 7, 2019	CPython 3.4	CPython 3.4 pymalloc	Windows x86-64	Details
lazy_object_proxy-1.4.0-cp34-cp34m-win32.whl 21.5 kB May 7, 2019	CPython 3.4	CPython 3.4 pymalloc	Windows x86-32	Details
lazy_object_proxy-1.4.0-cp34-cp34m-manylinux1_x86_64.whl 54.0 kB May 7, 2019	CPython 3.4	CPython 3.4 pymalloc	Linux glibc 2.5+ x86-64	Details
lazy_object_proxy-1.4.0-cp27-cp27mu-manylinux1_x86_64.whl 54.7 kB May 7, 2019	CPython 2.7	CPython 2.7 pymalloc wide-unicode	Linux glibc 2.5+ x86-64	Details
lazy_object_proxy-1.4.0-cp27-cp27m-win_amd64.whl 23.2 kB May 7, 2019	CPython 2.7	CPython 2.7 pymalloc	Windows x86-64	Details
lazy_object_proxy-1.4.0-cp27-cp27m-win32.whl 21.7 kB May 7, 2019	CPython 2.7	CPython 2.7 pymalloc	Windows x86-32	Details
lazy_object_proxy-1.4.0-cp27-cp27m-macosx_10_13_x86_64.whl 36.2 kB May 7, 2019	CPython 2.7	CPython 2.7 pymalloc	macOS 10.13+ x86-64	Details

Total release size: 610.3 kB

Release files / lazy-object-proxy-1.4.0.tar.gz

Download URL	lazy-object-proxy-1.4.0.tar.gz
Size	33.7 kB
Tags	Source
SHA-256 checksum How to use checksums	`7fb11d33d99a374e4b0c3fb20128890b9cf784ca7e4b91ecbb191d34618bd9fe`
BLAKE2b-256 checksum How to use checksums	`babdc259aae1ef43cd887e08959b70768861272e65c7a0fd44c66864bcc585f4`
Upload date	May 7, 2019
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/1.12.1 pkginfo/1.4.2 requests/2.18.4 setuptools/40.6.3 requests-toolbelt/0.8.0 tqdm/4.28.1 CPython/3.6.7`

Release files / lazy_object_proxy-1.4.0-cp37-cp37m-win_amd64.whl

Download URL	lazy_object_proxy-1.4.0-cp37-cp37m-win_amd64.whl
Size	25.1 kB
Tags	CPython 3.7 CPython 3.7 pymalloc Windows x86-64
SHA-256 checksum How to use checksums	`da7f2a6c82a11dc4e05bab73522f0d6dd4f3bbc8378cd4b0769137f342cdb3f0`
BLAKE2b-256 checksum How to use checksums	`a4da5d6a57d6d7cb8b4fae47c6f3eb9412ee6036fa949db9e31739c1bb430a42`
Upload date	May 7, 2019
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/1.12.1 pkginfo/1.4.2 requests/2.20.1 setuptools/39.0.1 requests-toolbelt/0.8.0 tqdm/4.28.1 CPython/3.7.1`

Release files / lazy_object_proxy-1.4.0-cp37-cp37m-win32.whl

Download URL	lazy_object_proxy-1.4.0-cp37-cp37m-win32.whl
Size	22.8 kB
Tags	CPython 3.7 CPython 3.7 pymalloc Windows x86-32
SHA-256 checksum How to use checksums	`f6c718ffca055852479880debbe717da952fcfd60067a0ddb6fe3b053b1d4de0`
BLAKE2b-256 checksum How to use checksums	`b90590c14de8ad9834e00262c88196ba987b48a28eba00accd4097077582a238`
Upload date	May 7, 2019
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/1.12.1 pkginfo/1.4.2 requests/2.20.1 setuptools/39.0.1 requests-toolbelt/0.8.0 tqdm/4.28.1 CPython/3.7.1`

Release files / lazy_object_proxy-1.4.0-cp37-cp37m-manylinux1_x86_64.whl

Download URL	lazy_object_proxy-1.4.0-cp37-cp37m-manylinux1_x86_64.whl
Size	54.2 kB
Tags	CPython 3.7 CPython 3.7 pymalloc Linux glibc 2.5+ x86-64
SHA-256 checksum How to use checksums	`9b41ec246d31ca6a840dcf67673b2668adc5a095c64310d26d73292588563ea3`
BLAKE2b-256 checksum How to use checksums	`676b1a9086c111cd99ca66b60dd8985e71ead25b904f784d304eadeffb789062`
Upload date	May 7, 2019
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/1.12.1 pkginfo/1.4.2 requests/2.20.1 setuptools/39.0.1 requests-toolbelt/0.8.0 tqdm/4.28.1 CPython/3.7.1`

Release files / lazy_object_proxy-1.4.0-cp37-cp37m-macosx_10_13_x86_64.whl

Download URL	lazy_object_proxy-1.4.0-cp37-cp37m-macosx_10_13_x86_64.whl
Size	35.8 kB
Tags	CPython 3.7 CPython 3.7 pymalloc macOS 10.13+ x86-64
SHA-256 checksum How to use checksums	`d49a90c27074f44c8dc147d83e31140523948ee147b3248634c540e053caea58`
BLAKE2b-256 checksum How to use checksums	`f53d209533332df3eb3a6ef512118ae910d4985df804f58d06016e0201b56090`
Upload date	May 7, 2019
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/1.12.1 pkginfo/1.4.2 requests/2.20.1 setuptools/39.0.1 requests-toolbelt/0.8.0 tqdm/4.28.1 CPython/3.7.1`

Release files / lazy_object_proxy-1.4.0-cp36-cp36m-win_amd64.whl

Download URL	lazy_object_proxy-1.4.0-cp36-cp36m-win_amd64.whl
Size	25.1 kB
Tags	CPython 3.6 CPython 3.6 pymalloc Windows x86-64
SHA-256 checksum How to use checksums	`642fc0a9b61920669dab66e400f79f1b8b0e8f698dcde85f7e9ae5528dbcaf4a`
BLAKE2b-256 checksum How to use checksums	`e237a122e38598fa7f76ddbe6ed9759aa461f29f7a45e12eea0c239e182c3853`
Upload date	May 7, 2019
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/1.12.1 pkginfo/1.4.2 requests/2.20.1 setuptools/39.0.1 requests-toolbelt/0.8.0 tqdm/4.28.1 CPython/3.7.1`

Release files / lazy_object_proxy-1.4.0-cp36-cp36m-win32.whl

Download URL	lazy_object_proxy-1.4.0-cp36-cp36m-win32.whl
Size	22.9 kB
Tags	CPython 3.6 CPython 3.6 pymalloc Windows x86-32
SHA-256 checksum How to use checksums	`7003959a170fde9b92936c38562810f94679c80608fb4b007e026b915bef8b27`
BLAKE2b-256 checksum How to use checksums	`3eae02c33be48997e1a2e45b2a18ef3c87dac3d0d62b89838d5509b56034568b`
Upload date	May 7, 2019
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/1.12.1 pkginfo/1.4.2 requests/2.20.1 setuptools/39.0.1 requests-toolbelt/0.8.0 tqdm/4.28.1 CPython/3.7.1`

Release files / lazy_object_proxy-1.4.0-cp36-cp36m-manylinux1_x86_64.whl

Download URL	lazy_object_proxy-1.4.0-cp36-cp36m-manylinux1_x86_64.whl
Size	54.2 kB
Tags	CPython 3.6 CPython 3.6 pymalloc Linux glibc 2.5+ x86-64
SHA-256 checksum How to use checksums	`8995543f47a8b81962e384f12791114af9f4997be7a0db71abc40d2a2dfee961`
BLAKE2b-256 checksum How to use checksums	`94e91e82e3b5d4f48625e7f5e6907a5dcf56acec8904f0c472718a13204f963d`
Upload date	May 7, 2019
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/1.12.1 pkginfo/1.4.2 requests/2.20.1 setuptools/39.0.1 requests-toolbelt/0.8.0 tqdm/4.28.1 CPython/3.7.1`

Release files / lazy_object_proxy-1.4.0-cp35-cp35m-win_amd64.whl

Download URL	lazy_object_proxy-1.4.0-cp35-cp35m-win_amd64.whl
Size	25.1 kB
Tags	CPython 3.5 CPython 3.5 pymalloc Windows x86-64
SHA-256 checksum How to use checksums	`55fa9eab93482891ce97473e63610efdd9c8fa5c05cca9f60468c412e602e499`
BLAKE2b-256 checksum How to use checksums	`8c76a3fcad4788b665a68f53841d659886a2bbe169f5d1b19c0bda65bd180429`
Upload date	May 7, 2019
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/1.12.1 pkginfo/1.4.2 requests/2.20.1 setuptools/39.0.1 requests-toolbelt/0.8.0 tqdm/4.28.1 CPython/3.7.1`

Release files / lazy_object_proxy-1.4.0-cp35-cp35m-win32.whl

Download URL	lazy_object_proxy-1.4.0-cp35-cp35m-win32.whl
Size	22.8 kB
Tags	CPython 3.5 CPython 3.5 pymalloc Windows x86-32
SHA-256 checksum How to use checksums	`118d53f8819f9457732dd0e418752f2850f395c5405b2e12485f52336e4ad0f5`
BLAKE2b-256 checksum How to use checksums	`0e01a9d91f83207bfd3a0dcbf94008a362222116d3559e89f98852e83b62b30a`
Upload date	May 7, 2019
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/1.12.1 pkginfo/1.4.2 requests/2.20.1 setuptools/39.0.1 requests-toolbelt/0.8.0 tqdm/4.28.1 CPython/3.7.1`

Release files / lazy_object_proxy-1.4.0-cp35-cp35m-manylinux1_x86_64.whl

Download URL	lazy_object_proxy-1.4.0-cp35-cp35m-manylinux1_x86_64.whl
Size	54.2 kB
Tags	CPython 3.5 CPython 3.5 pymalloc Linux glibc 2.5+ x86-64
SHA-256 checksum How to use checksums	`d6957cadc9c079ef4697564af500d52fba6d14fb2f08d20ce92f52201fb77050`
BLAKE2b-256 checksum How to use checksums	`2de5cae191672863102cb2a0a299dfe4e86e54309aabc3650391d41078d9d7df`
Upload date	May 7, 2019
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/1.12.1 pkginfo/1.4.2 requests/2.20.1 setuptools/39.0.1 requests-toolbelt/0.8.0 tqdm/4.28.1 CPython/3.7.1`

Release files / lazy_object_proxy-1.4.0-cp34-cp34m-win_amd64.whl

Download URL	lazy_object_proxy-1.4.0-cp34-cp34m-win_amd64.whl
Size	23.0 kB
Tags	CPython 3.4 CPython 3.4 pymalloc Windows x86-64
SHA-256 checksum How to use checksums	`7e63da94f5a1ddb0d2dcdb5d17ff4d1d33f51f3368bdf0475d5f56c0f3b99592`
BLAKE2b-256 checksum How to use checksums	`9486f1938b17669a5de8c2057b8c5063753e6065cf3fc15ea63d425f253862eb`
Upload date	May 7, 2019
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/1.12.1 pkginfo/1.4.2 requests/2.20.1 setuptools/39.0.1 requests-toolbelt/0.8.0 tqdm/4.28.1 CPython/3.7.1`

Release files / lazy_object_proxy-1.4.0-cp34-cp34m-win32.whl

Download URL	lazy_object_proxy-1.4.0-cp34-cp34m-win32.whl
Size	21.5 kB
Tags	CPython 3.4 CPython 3.4 pymalloc Windows x86-32
SHA-256 checksum How to use checksums	`f03a21f6f6e54778860122a620f70c8b148ec4ee175968782bcaaa94955a46f9`
BLAKE2b-256 checksum How to use checksums	`309ab6ebf166210ecba00d68c81f551d95d52c8abd29c2b2662d8522a7c8d063`
Upload date	May 7, 2019
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/1.12.1 pkginfo/1.4.2 requests/2.20.1 setuptools/39.0.1 requests-toolbelt/0.8.0 tqdm/4.28.1 CPython/3.7.1`

Release files / lazy_object_proxy-1.4.0-cp34-cp34m-manylinux1_x86_64.whl

Download URL	lazy_object_proxy-1.4.0-cp34-cp34m-manylinux1_x86_64.whl
Size	54.0 kB
Tags	CPython 3.4 CPython 3.4 pymalloc Linux glibc 2.5+ x86-64
SHA-256 checksum How to use checksums	`8758715ea005afa293783797498d64f40ab14d1ded208b3e282760cde9512f1d`
BLAKE2b-256 checksum How to use checksums	`8008d6d137ccc8cfeef6cb160bd4961a941411e0f880e008a927cea3875c42b4`
Upload date	May 7, 2019
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/1.12.1 pkginfo/1.4.2 requests/2.20.1 setuptools/39.0.1 requests-toolbelt/0.8.0 tqdm/4.28.1 CPython/3.7.1`

Release files / lazy_object_proxy-1.4.0-cp27-cp27mu-manylinux1_x86_64.whl

Download URL	lazy_object_proxy-1.4.0-cp27-cp27mu-manylinux1_x86_64.whl
Size	54.7 kB
Tags	CPython 2.7 CPython 2.7 pymalloc wide-unicode Linux glibc 2.5+ x86-64
SHA-256 checksum How to use checksums	`afcab74f471652b643900e0862b31892ac5fe5a75e435b786a1825855f4effdf`
BLAKE2b-256 checksum How to use checksums	`631eb31f5d8db6259d7ec558b903efed7caf3a45a605378f3fb0157bccca4a11`
Upload date	May 7, 2019
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/1.12.1 pkginfo/1.4.2 requests/2.20.1 setuptools/39.0.1 requests-toolbelt/0.8.0 tqdm/4.28.1 CPython/3.7.1`

Release files / lazy_object_proxy-1.4.0-cp27-cp27m-win_amd64.whl

Download URL	lazy_object_proxy-1.4.0-cp27-cp27m-win_amd64.whl
Size	23.2 kB
Tags	CPython 2.7 CPython 2.7 pymalloc Windows x86-64
SHA-256 checksum How to use checksums	`a8be3cfd7c3154e8d39276c627c5e7ee55d1f2094597b060ece99620ef9fe86b`
BLAKE2b-256 checksum How to use checksums	`515ce57c95f342d0d000f3c097957aedaa6379d329f72b3b64b109e73cd59f17`
Upload date	May 7, 2019
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/1.12.1 pkginfo/1.4.2 requests/2.20.1 setuptools/39.0.1 requests-toolbelt/0.8.0 tqdm/4.28.1 CPython/3.7.1`

Release files / lazy_object_proxy-1.4.0-cp27-cp27m-win32.whl

Download URL	lazy_object_proxy-1.4.0-cp27-cp27m-win32.whl
Size	21.7 kB
Tags	CPython 2.7 CPython 2.7 pymalloc Windows x86-32
SHA-256 checksum How to use checksums	`495c583b363c3eded649e2c00177093f03f856f5c9f95b527420084a9ce17b9d`
BLAKE2b-256 checksum How to use checksums	`835ca4c886fe4580f751c84c24bc479f8fe2186736a1637d39c96480d1f41a6f`
Upload date	May 7, 2019
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/1.12.1 pkginfo/1.4.2 requests/2.20.1 setuptools/39.0.1 requests-toolbelt/0.8.0 tqdm/4.28.1 CPython/3.7.1`

Release files / lazy_object_proxy-1.4.0-cp27-cp27m-macosx_10_13_x86_64.whl

Download URL	lazy_object_proxy-1.4.0-cp27-cp27m-macosx_10_13_x86_64.whl
Size	36.2 kB
Tags	CPython 2.7 CPython 2.7 pymalloc macOS 10.13+ x86-64
SHA-256 checksum How to use checksums	`91c7e1316116fedda36818ce7cd269378fffc4219781536eff441ea1e68e1caf`
BLAKE2b-256 checksum How to use checksums	`639b8f862314853198df85d6bb9b33403d96589e76ef7f6f6cd1a77c40adc728`
Upload date	May 7, 2019
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/1.12.1 pkginfo/1.4.2 requests/2.20.1 setuptools/39.0.1 requests-toolbelt/0.8.0 tqdm/4.28.1 CPython/3.7.1`