Installing flask; python script still cannot import

Question

I have tried every command line installation possible in an attempt to install flask. I have followed the instructions from http://flask.pocoo.org/docs/installation/

After sudo easy_install virtualenv:

Searching for virtualenv
Best match: virtualenv 1.11.6
Adding virtualenv 1.11.6 to easy-install.pth file
Installing virtualenv script to /usr/local/bin
Installing virtualenv-2.7 script to /usr/local/bin

Using /usr/local/lib/python2.7/dist-packages
Processing dependencies for virtualenv
Finished processing dependencies for virtualenv

after pip-install flask:

Requirement already satisfied (use --upgrade to upgrade): flask in ./python2.7/dist-packages
Requirement already satisfied (use --upgrade to upgrade): Werkzeug>=0.7 in ./python2.7/dist-packages (from flask)
Requirement already satisfied (use --upgrade to upgrade): Jinja2>=2.4 in ./python2.7/dist-packages (from flask)
Requirement already satisfied (use --upgrade to upgrade): itsdangerous>=0.21 in ./python2.7/dist-packages (from flask)
Requirement already satisfied (use --upgrade to upgrade): markupsafe in ./python2.7/dist-packages (from Jinja2>=2.4->flask)
Cleaning up...

However after . venv/bin/activate:

bash: venv/bin/activate: No such file or directory

I do know how to navigate around the terminal and create directories. I am uncertain how to process this command and/or activate virtualenv. I cannot find this directory or perhaps the sudo/pip commands were intended for a directory not defaulted on my drive?

I try and run a python script using flask, and of course:

Traceback (most recent call last):
  File "testingflask.py", line 1, in <module>
    from flask import Flask
ImportError: No module named flask

Here is the script: testingflask.py

from flask import flask
app = Flask(__name__)

@app.route("/")
def hello():
    return "Hello World!"

if __name__ == "__main__":
    app.run()

I have tried apt-get install python-flask as well

Activate your venv first, then use pip. Or explicitly use the bin/pip in the virtual env directory. You installed Flask in globally, but by default a virtual env ignores the global packages. — Martijn Pieters
– Martijn Pieters, Commented Jul 9, 2014 at 15:08

Antoine · Accepted Answer · 2014-07-09 15:09:03Z

1

Did you did the

$ mkdir myproject
$ cd myproject
$ virtualenv venv

step? (Apparently not)

In any case you should do the pip install Flask after activating the virutualenv. Else it get installed in you base python install.

Also take care, python is case sensitive:

from flask import Flask
app = Flask(__name__)

answered Jul 9, 2014 at 15:09

Antoine

1,0807 silver badges12 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

William Clemens Over a year ago

Remember you need to activate the virtual environment with . venv/bin/activate. This has to be done each time you open a new shell.

Mathias · Accepted Answer · 2014-07-09 15:11:35Z

0

Did you run virtualenv venv ? I mean do you have a venv folder in your project? I guess you missed that step!

$ sudo easy_install virtualenv or sudo easy_install virtualenv
$ mkdir myproject
$ cd myproject
virtualenv venv

I you follow those steps you should have a venv directory in myproject and the command $ . venv/bin/activate will work

edited Jul 9, 2014 at 15:11

answered Jul 9, 2014 at 15:06

Mathias

6,8282 gold badges24 silver badges36 bronze badges

Comments

Community · Accepted Answer · 2020-06-20 09:12:55Z

0

One more thing to try

know your python path where site-packages are stored
download the flask module and extract it
copy the extracted folder and paste it into your python packages directory(mostly site- packages/dist-packages for me :/usr/lib/python2.7/dist-packages) [remember root only can do this]
open your python shell
and check "import flask"

know the location of your library files:

In [1]: import sys

In [2]: sys.path
Out[2]: 
['',
 '/usr/bin',
 '/usr/lib/python2.7',
 '/usr/lib/python2.7/plat-x86_64-linux-gnu',
 '/usr/lib/python2.7/lib-tk',
 '/usr/lib/python2.7/lib-old',
 '/usr/lib/python2.7/lib-dynload',
 '/usr/local/lib/python2.7/dist-packages',
 '/usr/lib/python2.7/dist-packages',
 '/usr/lib/python2.7/dist-packages/PILcompat',
 '/usr/lib/python2.7/dist-packages/gtk-2.0',
 '/usr/lib/pymodules/python2.7',
 '/usr/lib/python2.7/dist-packages/ubuntu-sso-client',
 '/usr/lib/python2.7/dist-packages/ubuntuone-client',
 '/usr/lib/python2.7/dist-packages/ubuntuone-control-panel',
 '/usr/lib/python2.7/dist-packages/ubuntuone-storage-protocol',
 '/usr/lib/python2.7/dist-packages/IPython/extensions']

edited Jun 20, 2020 at 9:12

CommunityBot

11 silver badge

answered Jul 10, 2014 at 7:16

Nava

6,6069 gold badges47 silver badges69 bronze badges

2 Comments

phillipsK Over a year ago

I do have flask install in this path above, but whenever I move around and create a virualenv venv and then try to install flask via pip install flask I receive the following error

bash: /home/phillipk/rampup/sql/venv/bin/easy_install: /home/phillipsk/rampup/webapp/sql/venv/bin/python: bad interpreter: No such file or directory

and here are my contents of that path

activate  activate.csh  activate.fish  activate_this.py  easy_install  easy_install-2.7  pip  pip2  pip2.7  python  python2  python2.7 (venv)kup@kuprevicius:~/rampup/sql/venv/bin$ python

Nava Over a year ago

I think you can copy the flask modules and paste inside the venv lib packages directory and try it to run import flask in python shell

Collectives™ on Stack Overflow

Installing flask; python script still cannot import

3 Answers 3

1 Comment

Comments

One more thing to try

know the location of your library files:

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

One more thing to try

know the location of your library files:

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related