这应该可以工作:

import subprocess

def install(name):
    subprocess.call(['pip', 'install', name])

为了有条件地安装多个确切版本的包，我一直在使用基于@Tanmay Shrivastava的回答的这个模式:

import sys
from subprocess import run, PIPE, STDOUT
import pkg_resources

def run_cmd(cmd):
    ps = run(cmd, stdout=PIPE, stderr=STDOUT, shell=True, text=True)
    print(ps.stdout)


# packages to be conditionally installed with exact version
required = {"click==8.0.1", "semver==3.0.0.dev2"}
installed = {f"{pkg.key}=={pkg.version}" for pkg in pkg_resources.working_set}
missing = required - installed

if missing:
    run_cmd(f'pip install --ignore-installed {" ".join([*missing])}')

如果你想使用pip安装所需的包，并在安装后导入，你可以使用这段代码:

def install_and_import(package):
    import importlib
    try:
        importlib.import_module(package)
    except ImportError:
        import pip
        pip.main(['install', package])
    finally:
        globals()[package] = importlib.import_module(package)


install_and_import('transliterate')

如果您以用户身份安装包，可能会遇到不能直接导入包的问题。参见如何刷新sys.path?获取更多信息。

你还可以使用如下语句:

import pip

def install(package):
    if hasattr(pip, 'main'):
        pip.main(['install', package])
    else:
        pip._internal.main(['install', package])

# Example
if __name__ == '__main__':
    install('argh')

我在@Aaron的回答中添加了一些异常处理。

import subprocess
import sys

try:
    import pandas as pd
except ImportError:
    subprocess.check_call([sys.executable, "-m", "pip", "install", 'pandas'])
finally:
    import pandas as pd

这应该可以工作:

import subprocess

def install(name):
    subprocess.call(['pip', 'install', name])