I’m trying to use pip to install a package. I try to run
pip install from the Python shell, but I get a
SyntaxError. Why do I get this error? How do I use pip to install the package?
>>> pip install selenium ^ SyntaxError: invalid syntax
pip is run from the command line, not the Python interpreter. It is a program that installs modules, so you can use them from Python. Once you have installed the module, then you can open the Python shell and do
The Python shell is not a command line, it is an interactive interpreter. You type Python code into it, not commands.
Use the command line, not the Python shell (DOS, PowerShell in Windows).
C:Program FilesPython2.7Scripts> pip install XYZ
If you installed Python into your PATH using the latest installers, you don’t need to be in that folder to run pip
Terminal in Mac or Linux
$ pip install XYZ
As @sinoroc suggested correct way of installing a package via pip is using separate process since pip may cause closing a thread or may require a restart of interpreter to load new installed package so this is the right way of using the API:
subprocess.check_call([sys.executable, '-m', 'pip', 'install', 'SomeProject']) but since Python allows to access internal API and you know what you’re using the API for you may want to use internal API anyway eg. if you’re building own GUI package manager with alternative resourcess like https://www.lfd.uci.edu/~gohlke/pythonlibs/
Following soulution is OUT OF DATE, instead of downvoting suggest updates. see https://github.com/pypa/pip/issues/7498 for reference.
UPDATE: Since pip version 10.x there is no more
main method under
import pip instead use
import pip._internal as pip.
UPDATE ca. v.18
get_installed_distributions() has been removed. Instead you may use generator
freeze like this:
from pip._internal.operations.freeze import freeze print([package for package in freeze()]) # eg output ['pip==19.0.3']
If you want to use pip inside the Python interpreter, try this:
import pip package_names=['selenium', 'requests'] #packages to install pip.main(['install'] + package_names + ['--upgrade']) # --upgrade to install or update existing packages
If you need to update every installed package, use following:
import pip for i in pip.get_installed_distributions(): pip.main(['install', i.key, '--upgrade'])
If you want to stop installing other packages if any installation fails, use it in one single
import pip package_names = [i.key for i in pip.get_installed_distributions()] pip.main(['install'] + package_names + ['--upgrade'])
Note: When you install from list in file with
--requirement parameter you do NOT need open() function.
pip.main(['install', '-r', 'filename'])
Warning: Some parameters as simple
--help may cause python interpreter to stop.
Curiosity: By using
pip.exe you actually use python interpreter and pip module anyway. If you unpack
pip3.exe regardless it’s python 2.x or 3.x, inside is the SAME single file
# -*- coding: utf-8 -*- import re import sys from pip import main if __name__ == '__main__': sys.argv = re.sub(r'(-script.pyw?|.exe)?$', '', sys.argv) sys.exit(main())
To run pip in Python 3.x, just follow the instructions on Python’s page: Installing Python Modules.
python -m pip install SomePackage
Note that this is run from the command line and not the python shell (the reason for syntax error in the original question).
Initially I too faced this same problem, I installed python and when I run
pip command it used to throw me an error like shown in pic below.
Make Sure pip path is added in environmental variables. For me, the python and pip installation path is::
Both these paths were added to path in environmental variables.
Now Open a new cmd window and type pip, you should be seeing a screen as below.
pip install <<package-name>>. Here I’m installing package spyder so my command line statement will be as
pip install spyder and here goes my running screen..
and I hope we are done with this!!
you need to type it in cmd not in the IDLE. becuse IDLE is not an command prompt if you want to install something from IDLE type this
>>>from pip.__main__ import _main as main >>>main(#args splitted by space in list example:['install', 'requests'])
this is calling pip like
pip <commands> in terminal. The commands will be seperated by spaces that you are doing there to.
Programmatically, the following currently works. I see all the answers post 10.0 and all, but none of them are the correct path for me. Within Kaggle for sure, this apporach works
from pip._internal import main as _main package_names=['pandas'] #packages to install _main(['install'] + package_names + ['--upgrade'])
Try upgrade pip with the below command and retry
python -m pip install -U pip