In this tutorial, we'll deep dive into several reasons why you can't install new packages from PyPI.
This post will describe the different kinds of errors and their solution in Python - tested in Linux and Windows.
Documentation about installing Python packages with Pip: pip install
Reason 1: Dependency Error - "Installing build dependencies ... error"
The first reason that prevents you from installing the latest package versions is dependency error.
In the example below we are trying to install
pip install black
but the installation fails due to next error:
pip install black==20.8b1 Collecting black==20.8b1 Using cached black-20.8b1.tar.gz (1.1 MB) Installing build dependencies ... error
A possible solution is to check the latest versions of the package and to install one which is:
- supported by your version
- doesn't have dependency issues
pip install black==19.10b0
Reason 2: Upgrade pip/setuptools before installation of new packages
In case of errors or getting the wrong package version you can try to upgrade your package manager.
In case of a
python -m pip install --upgrade pip
Latest package versions might require features which are present in the latest versions of
Some package require also package
setuptools which can be upgraded by:
pip install setuptools --upgrade
pip install -U setuptools
Reason 3: Package is not supported by Python version
When a new Python version is released (i.e. 3.8, 3.9 etc) the package needs updates in order to support it.
You will face errors like:
running dist_info running build_src build_src building py_modules sources creating build creating build\src.win-amd64-3.9 creating build\src.win-amd64-3.9\numpy creating build\src.win-amd64-3.9\numpy\distutils building library "npymath" sources error: Microsoft Visual C++ 14.0 is required. Get it with "Build Tools for Visual Studio": https://visualstudio.microsoft.com/downloads/
error: Microsoft Visual C++ 14.0 is required (Unable to find vcvarsall.bat)
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
If you install a brand new version there is a high probability that many packages will fail to be installed.
There are two things you can do in this case:
- Verify the latest stable and secure Python version from:
You can find -
bugfix. Take the latest security one.
- Check if the problematic package support your Python version:
- go the PyPI
- find your package - https://pypi.org/project/black/
- check supported versions
Bonus for Windows: Windows Pip version - pipwin
Pipwin is advertised as:
pipwin is a complementary tool for pip on Windows. pipwin installs unofficial python package binaries for windows
It can help if you use Windows and Python:
pip install pipwin pipwin install black