How Do I Fix the 'Error: Unable to Find vcvarsall.bat' When Installing Python Packages?

Resolving "Error: Unable to Find vcvarsall.bat" with Python Package Installation

Upon attempting to install the Python package dulwich via pip or setup.py, some users encounter an enigmatic error: "error: Unable to find vcvarsall.bat." This issue arises due to the lack of a compatible Visual C installation required for building certain packages.

Solution for Windows:

For Windows systems, the Python interpreter searches for Visual Studio 2008 during package installations. However, you can trick Python into using a newer Visual Studio by modifying the VS90COMNTOOLS environment variable. Execute the following commands based on your Visual Studio version:

• Visual Studio 2010 (VS10): SET VS90COMNTOOLS=%VS100COMNTOOLS%
• Visual Studio 2012 (VS11): SET VS90COMNTOOLS=%VS110COMNTOOLS%
• Visual Studio 2013 (VS12): SET VS90COMNTOOLS=%VS120COMNTOOLS%
• Visual Studio 2015 (VS14): SET VS90COMNTOOLS=%VS140COMNTOOLS%

This solution allows Python to locate the necessary Visual C component for building the dulwich package successfully.

Caution:

It is worth noting that this solution may not work if you are compiling Python modules. Refer to "Building lxml for Python 2.7 on Windows" for more detailed information.

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