from matplotlib import _png, cbook, colors as mcolors, get_data_path, rcParams
Stacktrace:
[1] pyimport(::String) at /Users/hyzhou/.julia/packages/PyCall/kAhnQ/src/PyCall.jl:536
[2] __init__ () at /Users/hyzhou/.julia/packages/PyPlot/4wzW1/src/init.jl:195
[3] _include_from_serialized(::String, ::Array{Any,1}) at ./loading.jl:692
[4] _require_search_from_serialized(::Base.PkgId, ::String) at ./loading.jl:776
[5] _require(::Base.PkgId) at ./loading.jl:1001
[6] require(::Base.PkgId) at ./loading.jl:922
[7] require(::Module, ::Symbol) at ./loading.jl:917
during initialization of module PyPlot
```
I am wondering what is causing this behind the scene.
---
### Author:  [@ctkelley](https://discourse.julialang.org/u/ctkelley)
#### Post date: [March 16, 2020, 7:35pm UTC](https://discourse.julialang.org/t/error-when-using-pyplot-and-gtk-package/34559/2 "2020-03-16T19:35:16Z")
Did you find a solution? I just started having this problem today. All was well a couple months ago. Now when I try “using module\_that\_needs\_matplotlib” I get this …
> Info: Installing matplotlib via the Conda matplotlib package…
> [ Info: Running `conda install -y matplotlib` in root environment
> Collecting package metadata (current\_repodata.json): done
> Solving environment: done
> #all requested packages already installed.
Followed by this
> ERROR: LoadError: InitError: PyError (PyImport\_ImportModule
> The Python package matplotlib could not be found by pyimport. Usually this means
> that you did not install matplotlib in the Python version being used by PyCall.
I don’t seem to be the only one having this problem, but am having trouble understanding the solutions.
---
### Author:  [@henry2004y](https://discourse.julialang.org/u/henry2004y)
#### Post date: [March 16, 2020, 9:15pm UTC](https://discourse.julialang.org/t/error-when-using-pyplot-and-gtk-package/34559/3 "2020-03-16T21:15:07Z")
Please see this [issue](https://github.com/JuliaGraphics/Gtk.jl/issues/493). I didn’t continue from that point on, but changing the PyPlot backend should work:
`ENV["MPLBACKEND"]="tkagg"`
---
### Author:  [@ctkelley](https://discourse.julialang.org/u/ctkelley)
#### Post date: [March 16, 2020, 9:21pm UTC](https://discourse.julialang.org/t/error-when-using-pyplot-and-gtk-package/34559/4 "2020-03-16T21:21:55Z")
Thanks. how do I do that?
---
### Author:  [@ctkelley](https://discourse.julialang.org/u/ctkelley)
#### Post date: [March 16, 2020, 9:59pm UTC](https://discourse.julialang.org/t/error-when-using-pyplot-and-gtk-package/34559/5 "2020-03-16T21:59:34Z")
I tried that, but no joy. Now I get a different error
> [ Info: Running `conda install -y matplotlib` in root environment
# \>\>\>\>\>\>\>\>\>\>\>\>\>\>\>\>\>\>\>\>\>\> ERROR REPORT \<\<\<\<\<\<\<\<\<\<\<\<\<\<\<\<\<\<\<\<\<\<
```
Traceback (most recent call last):
File "/Users/ctk/.julia/conda/3/lib/python3.7/site-packages/conda/exceptions.py", line 1079, in __call__
return func(*args, **kwargs)
File "/Users/ctk/.julia/conda/3/lib/python3.7/site-packages/conda/cli/main.py", line 84, in _main
exit_code = do_call(args, p)
File "/Users/ctk/.julia/conda/3/lib/python3.7/site-packages/conda/cli/conda_argparse.py", line 82, in do_call
return getattr(module, func_name)(args, parser)
File "/Users/ctk/.julia/conda/3/lib/python3.7/site-packages/conda/cli/main_install.py", line 20, in execute
install(args, parser, 'install')
File "/Users/ctk/.julia/conda/3/lib/python3.7/site-packages/conda/cli/install.py", line 116, in install
if context.use_only_tar_bz2:
File "/Users/ctk/.julia/conda/3/lib/python3.7/site-packages/conda/base/context.py", line 710, in use_only_tar_bz2
import conda_package_handling.api
ModuleNotFoundError: No module named 'conda_package_handling.api'
```
Something seems badly broken.
---
### Author:  [@ctkelley](https://discourse.julialang.org/u/ctkelley)
#### Post date: [March 17, 2020, 12:14am UTC](https://discourse.julialang.org/t/error-when-using-pyplot-and-gtk-package/34559/6 "2020-03-17T00:14:15Z")
Spooky. There was a post in a related thread suggesting to
> rm -rf .julia
and start over. That seemed to work for me. I have no idea why.