为什么pip安装包不会出现在pip冻结中？

Question

I am trying to install this package via pip. When I run pip install flask-googlemaps , I see the usual output, and the package is installed successfully, along with a handful of dependencies. If I then run pip freeze , I see all dependencies listed, but not the package itself. Why?

Here's a comprehensive breakdown of my process. I tested on a fresh virtualenv to make sure I wasn't just missing it.

1. $ mkvirtualenv test1

    New python executable in /Users/me/.virtualenvs/test1/bin/python2.7 Also creating executable in /Users/me/.virtualenvs/test1/bin/python Installing setuptools, pip, wheel...done. virtualenvwrapper.user_scripts creating /Users/me/.virtualenvs/test1/bin/predeactivate virtualenvwrapper.user_scripts creating /Users/me/.virtualenvs/test1/bin/postdeactivate virtualenvwrapper.user_scripts creating /Users/me/.virtualenvs/test1/bin/preactivate virtualenvwrapper.user_scripts creating /Users/me/.virtualenvs/test1/bin/postactivate virtualenvwrapper.user_scripts creating /Users/me/.virtualenvs/test1/bin/get_env_details 

2. $ pip freeze

    (no results, because nothing has been installed yet) 

3. $ pip install flask-googlemaps

    Collecting flask-googlemaps Using cached Flask_GoogleMaps-0.2.5-py2.py3-none-any.whl Collecting flask (from flask-googlemaps) Using cached Flask-0.12.2-py2.py3-none-any.whl Collecting Werkzeug>=0.7 (from flask->flask-googlemaps) Using cached Werkzeug-0.12.2-py2.py3-none-any.whl Collecting Jinja2>=2.4 (from flask->flask-googlemaps) Using cached Jinja2-2.9.6-py2.py3-none-any.whl Collecting click>=2.0 (from flask->flask-googlemaps) Using cached click-6.7-py2.py3-none-any.whl Collecting itsdangerous>=0.21 (from flask->flask-googlemaps) Collecting MarkupSafe>=0.23 (from Jinja2>=2.4->flask->flask-googlemaps) Installing collected packages: Werkzeug, MarkupSafe, Jinja2, click, itsdangerous, flask, flask-googlemaps Successfully installed Jinja2-2.9.6 MarkupSafe-1.0 Werkzeug-0.12.2 click-6.7 flask-0.12.2 flask-googlemaps itsdangerous-0.24 

4. $ pip freeze

    click==6.7 Flask==0.12.2 itsdangerous==0.24 Jinja2==2.9.6 MarkupSafe==1.0 Werkzeug==0.12.2 

Note that flask-googlemaps is not included in the second pip freeze output, but all of its dependencies are.

What's even stranger is that I have full access to use the package now. It's installed, it just doesn't show up in pip freeze output.

Answer 1

Took some time but I tracked it down.

if you run

pip install -v flask-googlemaps

You will see at the end

Installing collected packages: Werkzeug, MarkupSafe, Jinja2, click, itsdangerous, flask, flask-googlemaps

  Compiling /private/var/folders/2h/0dr8jftd1916yq_lp40__wzh0000gn/T/pip-build-avapA_/Jinja2/jinja2/asyncfilters.py ...
    File "/private/var/folders/2h/0dr8jftd1916yq_lp40__wzh0000gn/T/pip-build-avapA_/Jinja2/jinja2/asyncfilters.py", line 7
      async def auto_to_seq(value):
              ^
  SyntaxError: invalid syntax

  Compiling /private/var/folders/2h/0dr8jftd1916yq_lp40__wzh0000gn/T/pip-build-avapA_/Jinja2/jinja2/asyncsupport.py ...
    File "/private/var/folders/2h/0dr8jftd1916yq_lp40__wzh0000gn/T/pip-build-avapA_/Jinja2/jinja2/asyncsupport.py", line 22
      async def concat_async(async_gen):
              ^
  SyntaxError: invalid syntax

To prove that this error is the cause of flask-googlemaps not showing up on pip freeze, I installed a previous version.

pip install flask-googlemaps==0.2.4
Collecting flask-googlemaps==0.2.4
Collecting Flask (from flask-googlemaps==0.2.4)
  Using cached Flask-0.12.2-py2.py3-none-any.whl
Collecting Werkzeug>=0.7 (from Flask->flask-googlemaps==0.2.4)
  Using cached Werkzeug-0.12.2-py2.py3-none-any.whl
Collecting Jinja2>=2.4 (from Flask->flask-googlemaps==0.2.4)
  Using cached Jinja2-2.9.6-py2.py3-none-any.whl
Collecting click>=2.0 (from Flask->flask-googlemaps==0.2.4)
  Using cached click-6.7-py2.py3-none-any.whl
Collecting itsdangerous>=0.21 (from Flask->flask-googlemaps==0.2.4)
Collecting MarkupSafe>=0.23 (from Jinja2>=2.4->Flask->flask-googlemaps==0.2.4)
Installing collected packages: Werkzeug, MarkupSafe, Jinja2, click, itsdangerous, Flask, flask-googlemaps
Successfully installed Flask-0.12.2 Jinja2-2.9.6 MarkupSafe-1.0 Werkzeug-0.12.2 click-6.7 flask-googlemaps-0.2.4 itsdangerous-0.24

Pip freeze now works

pip freeze
click==6.7
Flask==0.12.2
Flask-GoogleMaps==0.2.4
itsdangerous==0.24
Jinja2==2.9.6
MarkupSafe==1.0
Werkzeug==0.12.2

I have just filed a GitHub issue on your behalf.

Answer 2

Wonton,

It is interesting that you ran into that issue. I'm using python 3.6 and got no errors running

pip install -v flask-googlemaps

It installed completely and I am able to use the package.

I did a little poking around and this is what I discovered:

site-packages has the following entries for flask-googlemaps

flask_googlemaps
Flask-GoogleMaps-0.2.5-dist-info

I was able to get pip freeze to display flask-googlemaps by simply renaming the Flask-GoogleMaps-0.2.5-dist-info to match the formatting of flask_googlemap:

davidj> mv Flask-GoogleMaps-0.2.5.dist-info Flask_GoogleMaps-0.2.5.dist-info
davidj> pip freeze
clickk==6.7
Flask==0.12.2
Flask-GoogleMaps==0.2.5
itsdangerous==0.24
Jinja2==2.9.6
MarkupSafe==1.0
pkg-resources==0.0.0
Werkzeug==0.12.2

after doing that, all of the pip functions work for the package.

Perhaps pip has some required naming conventions to map the info directory to the package directory....

Answer 3

If you have multiple versions of python installed, pip can have unexpected behavior with respect to versions. Make sure to explicitly use pip2 install or pip3 install , and pip2 freeze or pip3 freeze to match with the version of python that you intend to use.

(Note: this answer may not be relevant to the OP's case, but answers the question "Why doesn't pip installed package show up in pip freeze?" for some other cases.)