# Why cannot Julia v1.4 find the installed Python?

**URL:** <https://discourse.julialang.org/t/why-cannot-julia-v1-4-find-the-installed-python/37726>\
**Category:** General Usage\
**Created:** [April 17, 2020, 12:17am UTC](https://discourse.julialang.org/t/why-cannot-julia-v1-4-find-the-installed-python/37726 "2020-04-17T00:17:08Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![fhkm](https://avatars.discourse-cdn.com/v4/letter/f/b19c9b/32.png) [@fhkm](https://discourse.julialang.org/u/fhkm)\
**Post date:** [April 17, 2020, 12:17am UTC](https://discourse.julialang.org/t/why-cannot-julia-v1-4-find-the-installed-python/37726/1 "2020-04-17T00:17:08Z")

</div>

1. I installed Python V3.8 on windows 7 x64 and would like to rebuild PyCall.
2. I added PyCall package.
3. I changed the global variable ENV

> ENV[“PYTHON”] = “D:\programs\python\v38\python.exe”

1. Then I use the command

> using Pkg;Pkg.build(“PyCall”)

I got the following error. **Julia v1.4 cannot find Python v3.8 I have installed on the folder** , although I set the global variable ENV.

```julia
julia> using Pkg;Pkg.build("PyCall")
   Building Conda ─→ `C:\Users\a225\.julia\packages\Conda\3rPhK\deps\bui
ld.log`
   Building PyCall → `C:\Users\a225\.julia\packages\PyCall\zqDXB\deps\bui
ld.log`
┌ Error: Error building `PyCall`:
│ ┌ Info: No system-wide Python was found; got the following error:
│ │ ErrorException("D:\\programs\\python\\v38\\python.exe is 32-bit, but
 Julia is 64-bit")
│ └ using the Python distribution in the Conda package
│ [ Info: Downloading miniconda installer ...
│ ERROR: LoadError: failed process: Process(`'C:\Windows\System32\Windows
PowerShell\v1.0\powershell.exe' -Version 3 -NoProfile -Command "[System.Net.ServicePointManager]::SecurityProtocol = [System.Net.SecurityProtocolType]::Tls12; (New-Object System.Net.Webclient).DownloadFile('https://repo.continuum.io/miniconda/Miniconda3-latest-Windows-x86_64.exe', 'C:\Users\a225\.julia\conda\3\installer.exe')"`, ProcessExited(3221225477)) [3221225477]
│ 
│ Stacktrace:
│ [1] pipeline_error at .\process.jl:525 [inlined]
│ [2] download_powershell(::String, ::String) at .\download.jl:20
│ [3] download at .\download.jl:64 [inlined]
│ [4] _install_conda(::String, ::Bool) at C:\Users\a225\.julia\packages\
Conda\3rPhK\src\Conda.jl:164
│ [5] _install_conda(::String) at C:\Users\a225\.julia\packages\Conda\3r
PhK\src\Conda.jl:155
│ [6] runconda(::Cmd, ::String) at C:\Users\a225\.julia\packages\Conda\3
rPhK\src\Conda.jl:112
│ [7] add(::String, ::String; channel::String) at C:\Users\a225\.julia\p
ackages\Conda\3rPhK\src\Conda.jl:188
│ [8] add at C:\Users\a225\.julia\packages\Conda\3rPhK\src\Conda.jl:187
[inlined] (repeats 2 times)
│ [9] top-level scope at C:\Users\a225\.julia\packages\PyCall\zqDXB\deps
\build.jl:84
│ [10] include(::String) at .\client.jl:439
│ [11] top-level scope at none:5
│ in expression starting at C:\Users\a225\.julia\packages\PyCall\zqDXB\de
ps\build.jl:43
└ @ Pkg.Operations D:\buildbot\worker\package_win64\build\usr\share\julia
\stdlib\v1.4\Pkg\src\Operations.jl:892

```

---

<div class="post-metadata">

**Author:** ![stevengj](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/stevengj/32/71_2.png) [@stevengj](https://discourse.julialang.org/u/stevengj)\
**Post date:** [April 17, 2020, 2:01am UTC](https://discourse.julialang.org/t/why-cannot-julia-v1-4-find-the-installed-python/37726/3 "2020-04-17T02:01:29Z")

</div>

6 posts were merged into an existing topic: [V1.4 failed to precompile PyCall and PyPlot on windows 7 x64](https://discourse.julialang.org/t/v1-4-failed-to-precompile-pycall-and-pyplot-on-windows-7-x64/37718)

---

<div class="post-metadata">

**Author:** ![stevengj](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/stevengj/32/71_2.png) [@stevengj](https://discourse.julialang.org/u/stevengj)\
**Post date:** [April 17, 2020, 2:01am UTC](https://discourse.julialang.org/t/why-cannot-julia-v1-4-find-the-installed-python/37726/4 "2020-04-17T02:01:30Z")

</div>