Pip: adding directory to PATH

Question

I am completely overwhelmed with installing Python3 and Pip. After running brew install Python3 it seems like Python3 was successfully installed.

Now I tried to run Scrapy again but this error occurs:

-bash: /usr/local/bin/scrapy: /usr/local/opt/python/bin/python2.7: bad interpreter: No such file or directory

I guess because the Python version changed? So I tried to uninstall Scrapy which needs pip.

Here comes the next issue - after installing pip like explained here (https://pip.pypa.io/en/stable/installing/#install-pip) I see this error:

Clms:~ userName$ python3 -m pip install -U --force-reinstall pip
Collecting pip
  Using cached pip-20.0.2-py2.py3-none-any.whl (1.4 MB)
Installing collected packages: pip
  Attempting uninstall: pip
    Found existing installation: pip 20.0.2
    Uninstalling pip-20.0.2:
      Successfully uninstalled pip-20.0.2
  WARNING: The scripts pip, pip3 and pip3.7 are installed in '/usr/local/Cellar/python/3.7.6_1/Frameworks/Python.framework/Versions/3.7/bin' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
Successfully installed pip-20.0.2

I truly have no idea how to fix that mess. Googled for hours, tried a lot but could not figure out to resolve this situation. Most explanations I encounter require more knowledge about this topic and one leads to the other.

I would be highly grateful for a rescue!

Thanks!

Solution

First, you're running the program with python 2.7 not with python 3.x To run the python on python 3.x use

python3 program.py

Second, regarding the warning. It means the path of the pip is not added to the environment variable PATH. Means you can't call pip from any location, you need to go to its root path to call pip.

Run the below command to update the environment variable PATH to include the root path of pip.

export PATH=/usr/local/Cellar/python/3.7.6_1/Frameworks/Python.framework/Versions/3.7/bin:$PATH

This change is temporary. Depends on your OS, different process you need to follow to permanently update environment variable PATH

Comments

[jordanm]

The error you get means that the python2.7 that you have is the wrong architecture (eg 32bit on a OS that will only run 64bit).

[AMC]

_ am completely overwhelmed with installing Python3 and Pip._ I would recommend using virtual environments, you'll feel much safer, and it should simplify things.

[user1658080]

Scrapy used to run just fine. I needed to update and now the mess. As far as I know there is no Python 2.x left on my machine. Any idea what I should do to have Python 3.x + pip work fine on my Mac? Thanks!

[AMC]

@user1658080 Virtual environments ;p

[user1658080]

Thanks so much! Works now again. How can I make it permanent? :)

[m0dknight]

You can check the below thread for Mac OS. For other OS, google it :P. [stackoverflow.com/questions/60204290/…