在windows上，在cmd中输入这个

c:\python\libs>python -m pip freeze

从外壳开始

ls site-packages

如果没有帮助，你可以这样做。

import sys
import os
for p in sys.path:
    print os.listdir( p )

看看会产生什么。

help('modules')

在Python shell/提示符中。

下面是一个python代码解决方案，它将返回已安装模块的列表。可以很容易地修改代码以包含版本号。

import subprocess
import sys
from pprint import pprint

installed_packages = reqs = subprocess.check_output([sys.executable, '-m', 'pip', 'freeze']).decode('utf-8')
installed_packages = installed_packages.split('\r\n')
installed_packages = [pkg.split('==')[0] for pkg in installed_packages if pkg != '']
pprint(installed_packages)

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

如果我们需要列出Python shell中已安装的包，可以使用help命令，如下所示

>>> help('modules package')