Cannot install using Python 3.9.0rc1

[tycarac]

lxml fails to install using Python 3.9.0rc1 on Windows 10, 64-bit.

Three parts below:
  1. command
  2. file command script
  3. file "install.log"

Steps:
  1. Unpack attached archive to empty directory
  2. Run script "install.cmd" as in "install.cmd > install.log 2>&1"

Error:
  fatal error C1083: Cannot open include file: 'libxml/xpath.h'

I suspect the lxml pipeline has yet to be updated for building with upcoming Python 3.9 and so the install tries to build from source (which fails).

[scoder (scoder)]

Thanks for the report. This is a general Windows build problem and has nothing to do with Py3.9.
I'll close this ticket as a user-side problem. I'll upload wheels for Py3.9 when I get to it.

[tycarac (tycarac)]

@scoder
Thanks for responding.

I saw in the environment matrix of appveyor config that Python 38 is listed twice.

I was able to use pip to download the 3.9 wheel down momentarily but then pip could not locate it. So park my 3.9 exploration for now.

How quickly the release cycle turns. Python 3.5 end-of-life is in three weeks.

[Anthony Peytoon (digitalcriminal)]

Finally, it's been added to 3.9.