python 2.7: cannot pip on windows “bash: pip: command not found”

问题

I am trying to install the SciPy stack located at https://scipy.org/stackspec.html [I am only allowed 2 links; trying to use them wisely]. I realize that there are much easier ways to do this, but I think there is a lot to be learned by doing it manually. I am relatively new to a lot of this stuff, so I apologize if I sound ignorant at any point.

I am running Windows 7 Enterprise - 64 bit. Here is what I have done so far:

Installed python-2.7.8.msi (32-bit) from https://www.python.org/download/releases/2.7.8/
Installed numpy-1.8.1-win32-superpack-python2.7 from http://sourceforge.net/projects/numpy/files/
Test: import numpy as np ---> no errors
Installed scipy library,
scipy-0.14.0-win32-superpack-python2.7.exe from (SCIPY DOT ORG LINK REMOVED) Test: import scipy as sp ---> no errors
Installed matplotlib: matplotlib-1.3.1.win32-py2.7.exe from (MATPLOTLIB DOT ORG LINK REMOVED)
Installed PIP by running script here: https://raw.githubusercontent.com/pypa/pip/master/contrib/get-pip.py I just copied-pasted script to a new file in IDLE,
saved as C:\Python27\Scripts\pip_install.py and clicked Run>module. No errors reported.

Does the path on which I saved pip_install.py matter?

6. HERE IS WHERE I FAIL

Attempted to install matlibplot dependency dateutil: Opened a Cygwin Shell, and typed

        cd C:\Python27          ! is it necessary to cd to python directtory?
        pip install python-dateutil

This results in the error:

    bash: pip: command not found

I get the same error attempting from cmd.

Any help is appreciated; the closest I found was bash: pip: command not found. But the OSX nature of it is just enough to confise me further.

UPADTE:

I added the pip-path per Paul H's suggestion below. It made the error go away, but strangely, nothing I pip actually installs. For example, in Cygwin, I type:

cbennett2> pip install python-dateutil
cbennett2>

You can see that there is no output or feedback from the shell (which I think there should be). Then when I go to a new python shell:

>>> from dateutil.parser import parse
Traceback (most recent call last):
  File "<pyshell#12>", line 1, in <module>
    from dateutil.parser import parse
ImportError: No module named dateutil.parser
>>>>

This happens with all of the modules that I thought I had pip'd ... pandas, tornado, etc.

回答1:

On Windows, pip lives in C:\[pythondir]\scripts.

So you'll need to add that to your system path in order to run it from the command prompt. You could alternatively cd into that directory each time, but that's a hassle.

See the top answer here for info on how to do that: Adding Python Path on Windows 7

Also, that is a terrifying way to install pip. Grab it from Christophe Gohlke. Grab everything else from there for that matter. http://www.lfd.uci.edu/~gohlke/pythonlibs/

回答2:

As long as pip lives within the scripts folder you can run

python -m pip ....

This will tell python to get pip from inside the scripts folder. This is also a good way to have both python2.7 and pyhton3.5 on you computer and have them in different locations. I currently have both python2 and pyhton3 installed on windows. When I type python it defaults to python2. But if I type python3 I can use python3. (I also had to change the python.exe file for python3 to "python3.exe")If I need to install flask for python 2 I can run

python -m pip install flask

and it will be installed in the pyhton2 folder, but if I need flask for python 3 I run:

python3 -m pip install flask

and I now have it in the python3 folder

回答3:

press [win] + Pause
Advanced settings
System variables
Append ;C:\python27\Scripts to the end of Path variable
Restart console

回答4:

On windows 7, you have to use this command: python -m pip install xxx. All above don't work for me.

回答5:

If this is for Cygwin, it installs "pip" as "pip2". Just create a softlink to "pip2" in the same location where "pip2" is installed.

回答6:

I found this much simpler. Simply type this into the terminal:

PATH=$PATH:C:\[pythondir]\scripts

回答7:

I had a similar problem running SciPy on my computer. There are two ways to fix this problem: 1. Yes you do need to cd into your python directory. 2. Sometimes you have to tell the computer explicitly what path to go through, you have to find the program you're using, open up the properties, and reroute the path it takes to run. 3. consult the manual: http://matplotlib.org/users/installing.html or http://www.scipy.org/install.html

the Scipy package is very finicky, and needs things spelled out in obnoxious detail.

来源：https://stackoverflow.com/questions/25328818/python-2-7-cannot-pip-on-windows-bash-pip-command-not-found

标签

python

bash

numpy

matplotlib

python-dateutil