我比较了五种方法来检索已安装的“模块”，所有这些都是我在这个线程中看到的

总结

PIP list和working_set是针对发行版的，而不是模块的。 Iter_modules和help("modules")非常相似，最大的区别是Iter_modules不包含内置模块。 PIP list和working_set非常相似，唯一不同的是working_set降低了所有大写字母。 内置模块只包含在help("modules")和builtin_module_names中。

相关的说明

发行版、包和模块通常具有相同的名称，因此很容易将它们误认为另一个。 importlib.util。Find_spec用于模块，区分大小写。 sys。Modules只列出导入的模块。

分布

我说分发而不是打包，因为我认为这样会减少误解。一个发行版/包可以包含多个包/模块。

已安装的发行版并不总是可以通过相同的名称导入。例如pip install Pillow是进口PIL。有时，一个发行版甚至可以导入多个模块。

方法(每列按顺序排列)

iter_modules

import pkgutil
{module.name for module in pkgutil.iter_modules()}

帮助("modules")(仅在终端中打印)

help("modules")

builtin_module_names

import sys
set(sys.builtin_module_names)

pip列表(仅在终端打印)

终端PIP清单

working_set

import pkg_resources
{pkg.key for pkg in pkg_resources.working_set}

结论

对于终端，我建议使用help("modules")或python -c "help("modules") "。 在这个帖子中投票最多的答案 对于编程方式，我建议使用iter_modules + builtin_module_names。 这个答案在这个帖子里 然而，这是非常复杂的信息，请看我下面的最小示例。

import sys
import pkgutil

def get_installed_modules_names():
    iter_modules = {module.name for module in pkgutil.iter_modules()}
    builtin = sys.builtin_module_names
    return set.union(iter_modules, builtin)

作品不考虑Pip版本

在python编辑器或IPython中运行以下命令:

import pkg_resources
installed_packages = {d.project_name: d.version for d in pkg_resources.working_set}
print(installed_packages)

阅读其他答案并将这个组合组合在一起，这是Python中最快和最简单的方法。

找到特定的包

你可以很方便地从词典中获取条目。

安装packages[‘pandas’]>> 1.16.4'

善用Pip List

pip列表将在你的jupyter笔记本中运行，简化了“快速检查” 与其他实用程序(如grep)结合使用(如果已安装) 例如，PIP列表| grep pandas将为您提供当前的pandas版本

使用pkgutil.iter_modules进行非常简单的搜索

from pkgutil import iter_modules
a=iter_modules()
while True:
    try: x=a.next()
    except: break
    if 'searchstr' in x[1]: print x[1]

help('modules')

在Python shell/提示符中。

此解决方案主要基于importlib和pkgutil模块，并与CPython 3.4和CPython 3.5一起工作，但不支持CPython 2。

解释

sys。Builtin_module_names -命名所有内置模块(看我的答案在这里) iter_modules() -返回所有可用模块的信息 Importlib.util.find_spec() -返回关于导入模块的信息，如果存在的话 BuiltinImporter -内置模块(文档)的导入器 SourceFileLoader -标准Python模块的导入器(默认扩展名为*.py) ExtensionFileLoader——作为共享库的模块导入器(用C或c++编写)

完整代码

import sys
import os
import shutil
import pkgutil
import importlib
import collections

if sys.version_info.major == 2:
    raise NotImplementedError('CPython 2 is not supported yet')


def main():

    # name this file (module)
    this_module_name = os.path.basename(__file__).rsplit('.')[0]

    # dict for loaders with their modules
    loaders = collections.OrderedDict()

    # names`s of build-in modules
    for module_name in sys.builtin_module_names:

        # find an information about a module by name
        module = importlib.util.find_spec(module_name)

        # add a key about a loader in the dict, if not exists yet
        if module.loader not in loaders:
            loaders[module.loader] = []

        # add a name and a location about imported module in the dict
        loaders[module.loader].append((module.name, module.origin))

    # all available non-build-in modules
    for module_name in pkgutil.iter_modules():

        # ignore this module
        if this_module_name == module_name[1]:
            continue

        # find an information about a module by name
        module = importlib.util.find_spec(module_name[1])

        # add a key about a loader in the dict, if not exists yet
        loader = type(module.loader)
        if loader not in loaders:
            loaders[loader] = []

        # add a name and a location about imported module in the dict
        loaders[loader].append((module.name, module.origin))

    # pretty print
    line = '-' * shutil.get_terminal_size().columns
    for loader, modules in loaders.items():
        print('{0}\n{1}: {2}\n{0}'.format(line, len(modules), loader))
        for module in modules:
            print('{0:30} | {1}'.format(module[0], module[1]))


if __name__ == '__main__':
    main()

使用

对于CPython3.5(截断)

$ python3.5 python_modules_info.py 
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
30: <class '_frozen_importlib.BuiltinImporter'>
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
_ast                           | built-in
_codecs                        | built-in
_collections                   | built-in
_functools                     | built-in
_imp                           | None
_io                            | built-in
_locale                        | built-in
_operator                      | built-in
_signal                        | built-in
_sre                           | built-in
_stat                          | built-in
_string                        | built-in
_symtable                      | built-in
_thread                        | built-in
(****************************truncated*******************************)
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
227: <class '_frozen_importlib_external.SourceFileLoader'>
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
__future__                     | /usr/local/lib/python3.5/__future__.py
_bootlocale                    | /usr/local/lib/python3.5/_bootlocale.py
_collections_abc               | /usr/local/lib/python3.5/_collections_abc.py
_compat_pickle                 | /usr/local/lib/python3.5/_compat_pickle.py
_compression                   | /usr/local/lib/python3.5/_compression.py
_dummy_thread                  | /usr/local/lib/python3.5/_dummy_thread.py
_markupbase                    | /usr/local/lib/python3.5/_markupbase.py
_osx_support                   | /usr/local/lib/python3.5/_osx_support.py
_pydecimal                     | /usr/local/lib/python3.5/_pydecimal.py
_pyio                          | /usr/local/lib/python3.5/_pyio.py
_sitebuiltins                  | /usr/local/lib/python3.5/_sitebuiltins.py
(****************************truncated*******************************)
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
64: <class '_frozen_importlib_external.ExtensionFileLoader'>
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
_bisect                        | /usr/local/lib/python3.5/lib-dynload/_bisect.cpython-35m-x86_64-linux-gnu.so
_bz2                           | /usr/local/lib/python3.5/lib-dynload/_bz2.cpython-35m-x86_64-linux-gnu.so
_codecs_cn                     | /usr/local/lib/python3.5/lib-dynload/_codecs_cn.cpython-35m-x86_64-linux-gnu.so
_codecs_hk                     | /usr/local/lib/python3.5/lib-dynload/_codecs_hk.cpython-35m-x86_64-linux-gnu.so
_codecs_iso2022                | /usr/local/lib/python3.5/lib-dynload/_codecs_iso2022.cpython-35m-x86_64-linux-gnu.so
(****************************truncated*******************************)

对于CPython3.4(截断)

$ python3.4 python_modules_info.py
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
54: <class '_frozen_importlib.BuiltinImporter'>
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
_ast                           | built-in
_bisect                        | built-in
_codecs                        | built-in
_collections                   | built-in
_datetime                      | built-in
_elementtree                   | built-in
_functools                     | built-in
_heapq                         | built-in
_imp                           | None
_io                            | built-in
_locale                        | built-in
_md5                           | built-in
_operator                      | built-in
_pickle                        | built-in
_posixsubprocess               | built-in
_random                        | built-in
(****************************truncated*******************************)
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
246: <class '_frozen_importlib.SourceFileLoader'>
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
__future__                     | /usr/lib/python3.4/__future__.py
_bootlocale                    | /usr/lib/python3.4/_bootlocale.py
_collections_abc               | /usr/lib/python3.4/_collections_abc.py
_compat_pickle                 | /usr/lib/python3.4/_compat_pickle.py
_dummy_thread                  | /usr/lib/python3.4/_dummy_thread.py
_markupbase                    | /usr/lib/python3.4/_markupbase.py
_osx_support                   | /usr/lib/python3.4/_osx_support.py
_pyio                          | /usr/lib/python3.4/_pyio.py
(****************************truncated*******************************)
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
44: <class '_frozen_importlib.ExtensionFileLoader'>
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
_bz2                           | /usr/lib/python3.4/lib-dynload/_bz2.cpython-34m-x86_64-linux-gnu.so
_codecs_cn                     | /usr/lib/python3.4/lib-dynload/_codecs_cn.cpython-34m-x86_64-linux-gnu.so
_codecs_hk                     | /usr/lib/python3.4/lib-dynload/_codecs_hk.cpython-34m-x86_64-linux-gnu.so
_codecs_iso2022                | /usr/lib/python3.4/lib-dynload/_codecs_iso2022.cpython-34m-x86_64-linux-gnu.so
_codecs_jp                     | /usr/lib/python3.4/lib-dynload/_codecs_jp.cpython-34m-x86_64-linux-gnu.so
_codecs_kr                     | /usr/lib/python3.4/lib-dynload/_codecs_kr.cpython-34m-x86_64-linux-gnu.so
_codecs_tw                     | /usr/lib/python3.4/lib-dynload/_codecs_tw.cpython-34m-x86_64-linux-gnu.so
_crypt                         | /usr/lib/python3.4/lib-dynload/_crypt.cpython-34m-x86_64-linux-gnu.so
(****************************truncated*******************************)

我需要找到AWS Lambda中默认可用的软件包的特定版本。我这样做是从这个页面的想法混搭。我要为子孙后代分享。

import pkgutil

__version__ = '0.1.1'

def get_ver(name):
    try:
        return str(__import__(name).__version__)
    except:
        return None

def lambda_handler(event, context):
    return {
        'statusCode': 200,
        'body': [{
                   'path': m.module_finder.path,
                   'name': m.name,
                   'version': get_ver(m.name),
                 } for m in list(pkgutil.iter_modules())
                 #if m.module_finder.path == "/var/runtime" # Uncomment this if you only care about a certain path
                ],
    }

我发现提供的boto3库已经过时了，代码失败并不是我的错。我只需要添加boto3和botocore到我的项目。但如果没有这个，我可能会一直在想我的代码很糟糕。

{
  "statusCode": 200,
  "body": [
    {
      "path": "/var/task",
      "name": "lambda_function",
      "version": "0.1.1"
    },
    {
      "path": "/var/runtime",
      "name": "bootstrap",
      "version": null
    },
    {
      "path": "/var/runtime",
      "name": "boto3",
      "version": "1.9.42"
    },
    {
      "path": "/var/runtime",
      "name": "botocore",
      "version": "1.12.42"
    },
    {
      "path": "/var/runtime",
      "name": "dateutil",
      "version": "2.7.5"
    },
    {
      "path": "/var/runtime",
      "name": "docutils",
      "version": "0.14"
    },
    {
      "path": "/var/runtime",
      "name": "jmespath",
      "version": "0.9.3"
    },
    {
      "path": "/var/runtime",
      "name": "lambda_runtime_client",
      "version": null
    },
    {
      "path": "/var/runtime",
      "name": "lambda_runtime_exception",
      "version": null
    },
    {
      "path": "/var/runtime",
      "name": "lambda_runtime_marshaller",
      "version": null
    },
    {
      "path": "/var/runtime",
      "name": "s3transfer",
      "version": "0.1.13"
    },
    {
      "path": "/var/runtime",
      "name": "six",
      "version": "1.11.0"
    },
    {
      "path": "/var/runtime",
      "name": "test_bootstrap",
      "version": null
    },
    {
      "path": "/var/runtime",
      "name": "test_lambda_runtime_client",
      "version": null
    },
    {
      "path": "/var/runtime",
      "name": "test_lambda_runtime_marshaller",
      "version": null
    },
    {
      "path": "/var/runtime",
      "name": "urllib3",
      "version": "1.24.1"
    },
    {
      "path": "/var/lang/lib/python3.7",
      "name": "__future__",
      "version": null
    },
...

我所发现的也与他们官方公布的有所不同。在撰写本文时:

操作系统-亚马逊Linux AMI - amzn-ami-hvm-2017.03.1.20170812-x86_64-gp2 Linux内核- 4.14.77-70.59.amzn1.x86_64 AWS SDK for JavaScript - 2.290.0\ Python SDK (Boto 3) - 3-1.7.74 botocore-1.10.74