Why ValueError(\'operator must be unary (1), binary (2), or ternary (3)\') and how to solve it

The reason for the error

ValueError("operator must be unary (1), binary (2), or ternary (3)") is due to using pip to install python A problem occurred while compiling a certain C extension module. This is usually caused by a missing dependent library or compilation environment problem.

How to solve

The solution may be multiple, but one of them may be to check whether the required dependent libraries are installed on the system and make sure they are available. If any dependent libraries are missing, install them.

If the problem persists, you can try reinstalling the package using the --no-binary option. This option tells pip not to install the package using binaries, but to compile and install it from source.

For example:

如果仍然无法解决问题，可以尝试清除 pip 缓存，以便重新安装包。这可以通过运行以下命令来完成：

If the problem still cannot be solved, you can try reinstalling the package on a newer Python version.

Usage Example

Yes, for example, suppose you want to install the pandas package, but the above error occurs during the installation process, then you can try the following command

pip install --no-binary :all: pandas

In this way, pip will ignore the pre-compiled binary files and use the source code to compile and install the pandas package

If it still doesn't work, you can try

pip cache purge

Clear the cache and then reinstall the pandas package

If the problem still cannot be solved, it is recommended that you upgrade your python version or try to install it in other environments

pip install pandas

These steps are common solutions, but they are not guaranteed to always solve the problem because there may be other problems causing this error.

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