Julia 中的 PyCall 构建错误和 conda.core.link 错误

Question

I am new to Julia and want to run a script in Julia. The script needs to install PyPlot package, so I type Pkg.add("PyPlot") to add it. However, after downloading and updating some packages the following error will appears:

Preparing transaction: done Verifying transaction: done Executing transaction: failed ERROR conda.core.link:_execute(502): An error occurred while installing package 'defaults::charset-normalizer-2.0.4-pyhd3eb1b0_0'. CondaError: Cannot link a source that does not exist. C:\Users\seabd4.julia\v0.6\Conda\deps\usr\Scripts\conda.exe Running conda clean --packages may resolve your problem. Attempting to roll back.

Rolling back transaction: done

CondaError: Cannot link a source that does not exist. C:\Users\seabd4.julia\v0.6\Conda\deps\usr\Scripts\conda.exe Running conda clean --packages may resolve your problem.

=====================[ BUILD ERRORS ]==============================

WARNING: PyCall had build errors.

• packages with build errors remain installed in C:\Users\seabd4.julia\v0.6
• build the package(s) and all dependencies with Pkg.build("PyCall")
• build a single package by running its deps/build.jl script

====================================================================

So, I tried to type conda clean --packages but an error appeared again

ERROR: syntax: extra token "clean" after end of expression

Would you please help me solve this problem?

Answer 1

Use Python that is built into Julia. Using an external Python is always possible but more pain;-)

using Pkg
ENV["PYTHON"]=""
Pkg.build("PyCall")
Pkg.build("Conda")
Pkg.add("PyPlot") # or Pkg.build("PyPlot") depending when it failed