virtualenv forces the use of Python 3

[oSoMoN]

I'm using snapcraft-pr to test the work on the gnome extension, and when rebuilding the chromium snap, I'm getting errors when the build system runs python 2 scripts, such as:

+ out/Release/gn gen out/Release
ERROR at //build/util/branding.gni:27:11: Script returned non-zero exit code.
_result = exec_script("version.py",
          ^----------
Current dir: /mnt/chromium/snap-from-source/parts/chromium/build/out/Release/
Command: python /mnt/chromium/snap-from-source/parts/chromium/build/build/util/version.py -f ../../chrome/app/theme/chromium/BRANDING -t full_name = "@PRODUCT_FULLNAME@" short_name = "@PRODUCT_SHORTNAME@" bundle_id = "@MAC_BUNDLE_ID@" creator_code = "@MAC_CREATOR_CODE@" installer_full_name = "@PRODUCT_INSTALLER_FULLNAME@" installer_short_name = "@PRODUCT_INSTALLER_SHORTNAME@" team_id = "@MAC_TEAM_ID@" 
Returned 1.
stderr:

  File "/mnt/chromium/snap-from-source/parts/chromium/build/build/util/version.py", line 71
    print repr(key), repr(val)
             ^
SyntaxError: invalid syntax

I'm guessing the virtualenv in which snapcraft-pr runs only exposes python3. Not sure whether that can be "fixed", input welcome.

[kyrofa]

Yeah, I've run into this before, it seems impossible to create a venv for both python2 and 3 :( .