Python软件包安装在哪里

Question

I'm learning Python 3.5 using Visual Studio as my IDE. I installed the Python Tools for VS and looking at the code. I see there are a lot of from statements that reference Python packages:

from __future__ import unicode_literals

from django import forms
from django.contrib.auth import (
    authenticate, get_user_model, password_validation,
)
from django.contrib.auth.hashers import (
    UNUSABLE_PASSWORD_PREFIX, identify_hasher,
)
from django.contrib.auth.models import User
from django.contrib.auth.tokens import default_token_generator
from django.contrib.sites.shortcuts import get_current_site
from django.core.mail import EmailMultiAlternatives

Where are these pacakges stored on my Windows machine? I tried looking in the Python installation folders/subfolders but nothing. What are the file names including the extension?

Answer 1

__future__ isn't a package - it's a special future statement which declares the use of a planned Python feature.

For your other packages, you'll usually find them in your Python install location (for me, this was C:\\Python34 ) > Lib > site-packages . Here there are directories for most packages, and then .py files for some others.

If you can't find packages there, have a look at the value of the PYTHONPATH environment variable on your system. This will point to extra packages not found in Lib/site-packages .