python - How to install pandas from pip on windows cmd?

Question

I am trying to install pandas using pip to run some pandas-based Python programs. I already installed pip. I tried googling and SO'ing but didn't find a solution to this error. Can somebody share your inputs on this?

C:> pip install pandas

Error:

pip is not recognized as an internal or external command, operable program or batch file.

Answer 1

Since both pip nor python commands are not installed along Python in Windows, you will need to use the Windows alternative py, which is included by default when you installed Python. Then you have the option to specify a general or specific version number after the py command.

C:> py      -m pip install pandas  %= one of Python on the system =%
C:> py -2   -m pip install pandas  %= one of Python 2 on the system =%
C:> py -2.7 -m pip install pandas  %= only for Python 2.7 =%
C:> py -3   -m pip install pandas  %= one of Python 3 on the system =%
C:> py -3.6 -m pip install pandas  %= only for Python 3.6 =%

Alternatively, in order to get pip to work without py -m part, you will need to add pip to the PATH environment variable.

C:> setx PATH "%PATH%;C:<pathopythonfolder>Scripts"

Now you can run the following command as expected.

C:> pip install pandas

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Troubleshooting:

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Problem:

connection error: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed

Solution:

This is caused by your SSL certificate is unable to verify the host server. You can add pypi.python.org to the trusted host or specify an alternative SSL certificate. For more information, please see this post. (Thanks to Anuj Varshney for suggesting this)

C:> py -m pip install --trusted-host pypi.python.org pip pandas

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Problem:

PermissionError: [WinError 5] Access is denied

Solution:

This is a caused by when you don't permission to modify the Python site-package folders. You can avoid this with one of the following methods:

• Run Windows Command Prompt as administrator (thanks to DataGirl's suggestion) by:

  1. + R to open run
  2. type in cmd.exe in the search box
  3. CTRL + SHIFT + ENTER
  4. An alternative method for step 1-3 would be to manually locate cmd.exe, right click, then click Run as Administrator.

• Run pip in user mode by adding --user option when installing with pip. Which typically install the package to the local %APPDATA% Python folder.

C:> py -m pip install --user pandas

• Create a virtual environment.

C:> py -m venv c:patho
ewvenv
C:> <pathohe
ewvenv>Scriptsactivate.bat