ImportError No module named sqlalchemy

Question

I m unable to find a module in python  though easy install says its already installed  Any idea how to resolve this isseue      python -c  from flaskext sqlalchemy import SQLAlchemy  Traceback  most recent call last     File   lt string gt    line 1  in  lt module gt  ImportError  No module named sqlalchemy     python -V Python 2 7     sudo easy install sqlalchemy Searching for sqlalchemy Best match  SQLAlchemy 0 7 7 Adding SQLAlchemy 0 7 7 to easy-install pth file  Using  usr lib python2 7 site-packages Processing dependencies for sqlalchemy Finished processing dependencies for sqlalchemy        sudo pip install SQLAlchemy --upgrade Requirement already   up-to-date  SQLAlchemy in  usr lib python2 7 site-packages Cleaning   up      Though pip says it s installed But I can t find them in sys path output     sudo python -c  import sys print sys path         usr lib python2 7 site-packages Flask SQLAlchemy-0 15-py2 7 egg     usr lib python2 7 site-packages Flask-0 8-py2 7 egg     usr lib python2 7 site-packages Jinja2-2 6-py2 7 egg     usr lib python2 7 site-packages Werkzeug-0 8 3-py2 7 egg     usr lib python2 7 site-packages Flask WTF-0 5 2-py2 7 egg     usr lib python2 7 site-packages WTForms-0 6 3-py2 7 egg     usr lib python2 7 site-packages Flask Mail-0 6 1-py2 7 egg     usr lib python2 7 site-packages blinker-1 2-py2 7 egg     usr lib python2 7 site-packages lamson-1 1-py2 7 egg     usr lib python2 7 site-packages python daemon-1 6-py2 7 egg     usr lib python2 7 site-packages nose-1 1 2-py2 7 egg     usr lib python2 7 site-packages mock-0 8 0-py2 7 egg     usr lib python2 7 site-packages chardet-1 0 1-py2 7 egg     usr lib python2 7 site-packages lockfile-0 9 1-py2 7 egg     usr lib python2 7 site-packages Flask FlatPages-0 2-py2 7 egg     usr lib python2 7 site-packages Markdown-2 1 1-py2 7 egg     usr lib python2 7 site-packages PyYAML-3 10-py2 7-linux-i686 egg     usr lib python2 7 site-packages uWSGI-1 0 3-py2 7 egg     usr lib python2 7 site-packages MySQL python-1 2 3-py2 7-linux-i686 egg     usr lib python27 zip     usr lib python2 7     usr lib python2 7 plat-linux2     usr lib python2 7 lib-tk     usr lib python2 7 lib-old     usr lib python2 7 lib-dynload     usr lib python2 7 site-packages     usr lib python2 7 site-packages setuptools-0 6c11-py2 7 egg-info

User · Answer

Did you install flask-sqlalchemy   It looks like you have SQLAlchemy installed but not the Flask extension  Try pip install Flask-SQLAlchemy in your project s virtualenv to install it from PyPI

User · Answer

This code works perfectly   import sqlalchemy   Maybe you installed the package in another version of the interpreter   Also  like Shawley pointed out  you need to have the flask extension installed in order for it to be accessible

User · Answer

Okay I have re-installed the package via pip even that didn t help  And then I rsync ed the entire  usr lib python-2 7 directory from other working machine with similar configuration to the current machine It started working  I don t have any idea  what was wrong with my setup  I see some difference  print sys path  output earlier and now  but now my issue is resolved by this work around   EDIT Found the real solution for my setup  upgrading  sqlalchemy only doesn t solve the issue  I also need to upgrade flask-sqlalchemy that resolved the issue

User · Answer

So here is an idea   Since it seemed to work somewhere else   install python-virtualenv and optionally you can install virtualenv-wrapper  which is pretty cool to create projects and so on   In each env  you might have different versions of eggs  In other word  you could have sqlalchemy 1 and sqlaclhemy 1 5 in two different envs and they won t conflict with each others  It seems that you have a problem with your currently installed eggs    So here we go   virtualenv --no-site-packages foo source foo bin activate   The parameter --no-site-packages will create a virtualenv and not use the packages already installed on your computer  It s pretty much like a bare python install   source foo bin activate loads the virtualenv    It s not that really userfriendly  And that s why http   www doughellmann com projects virtualenvwrapper  exists   That said  you should see somthing like thant in your terminal   foo user domain    once your virtualenv is activated  It means that you can go on   Then you have to do   python setup py develop of your project  It should download and install dependencies of your project in the virtualenv located in foo  If you need to install anything else  please use pip or easy install without using sudo  When using virtualenv  you almost never need to use sudo  Sudo will install package in your global python install while it s not required and not really desirable    If something happens in your virtualenv  you can always delete it and create a new one  This is no big deal  No need to mess with anything  Doesn t work  start over  do pip install -U if needed  define the versions if needed and so on   Last but not least  in the other answers  it seems that the import changed  If the new versions for flask-sqlalchemy is located somewhere else  you should update your import or install the version you used to use

User · Answer

first install the library  pip install flask sqlalchemy    after that   from flask sqlalchemy import SQLAlchemy   put this in app py file to get the access of database through SQLAlchemy

User · Answer

I just experienced the same problem using the virtual environment  For me installing the package using python from the venv worked     venv environment Scripts python exe -m pip install flask-sqlalchemy

User · Answer

I just experienced the same problem  Apparently  there is a new distribution method  the extension code is no longer stored under flaskext   Source  Flask CHANGELOG This worked for me   from flask sqlalchemy import SQLAlchemy

User · Answer

try this   from flask ext sqlalchemy import SQLAlchemy

User · Answer

Install Flask-SQLAlchemy with pip in your virtualenv   pip install flask sqlalchemy   Then import flask sqlalchemy in your code   from flask sqlalchemy import SQLAlchemy

User · Answer

On Windows 10   2019 I faced the same problem  Turns out I forgot to install the following package  pip install flask sqlalchemy  After installing the package  everything worked perfectly  Hope  it helped some other noob like me

User · Answer

Probably a stupid mistake  but  I experienced this problem and the issue turned out to be that  quot pip3 install sqlalchemy quot  installs libraries in user specific directories  On my Linux machine  I was logged in as user1 executing a python script in user2 s directory  I installed sqlalchemy as user1 and it by default placed the files in user1 s directory  After installing sqlalchemy in user2 s directory the problem went away

User · Answer

I m new comer  use python 3 8 and met the same problem  I installed with pip instead of pip3 because i thought the pip installer is the same for python2 and python3 so this is proper installation   pip3 install flask sqlalchemy

User · Answer

Solution for me was to use   from flask sqlalchemy import SQLAlchemy   instead of   from flask ext sqlalchemy import SQLAlchemy

User · Answer

Very late to the party but hopefully this will help someone  was in the same situation for about a hour without any of the solutions mentioned above working   On a Windows 10 machine    In the Settings Preferences dialog  Ctrl Alt S   from the side menu select Project     Project Interpreter    Check which packages you currently have installed  You need SQLAlchemy and Flask-SQLAlchemy   Double click on any package name  an  Available Packages  menu will open    Search for the missing package s  and click install

[python] ImportError: No module named sqlalchemy

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