Weird behaviour with CPython

Runtime
1

Weird behaviour

Hello guys, I am facing weird bug while using CPython. When I use the below code, I am getting IronPython output.

#
#! python3

print("Hello from CPython")
import sys
print(sys.version)

Output -

Hello from CPython
2.7.12 (2.7.12.1000) 
[.NETStandard,Version=v2.0 on .NET 8.0.27 (64-bit)]

But when I use the below code, I am getting error.

#! python3

print("Hello from CPython")
import sys
print(sys.version)

image
image552×374 61 KB

image
image973×169 31.8 KB

Can someone share the explaination :sweat_smile: ?

2

Can you check the output of ‘pyrevit env’ command line?

3

@Jean-Marc Output from pyrevit env -

==> Registered Clones (full git repos)
==> Registered Clones (deployed from archive/image)
master | Branch: "master" | Version: "6.4.0.26100+0515" | Path: "C:\Users\ACER\AppData\Roaming\pyRevit-Master"
==> Attachments
master | Product: "2027" | Engine: DEFAULT (2712) | Path: "C:\Users\ACER\AppData\Roaming\pyRevit-Master"
master | Product: "2026 First Customer Ship" | Engine: DEFAULT (2712) | Path: "C:\Users\ACER\AppData\Roaming\pyRevit-Master"
master | Product: "2025 First Customer Ship" | Engine: DEFAULT (2712) | Path: "C:\Users\ACER\AppData\Roaming\pyRevit-Master"
master | Product: "2024.3.4" | Engine: DEFAULT (2712) | Path: "C:\Users\ACER\AppData\Roaming\pyRevit-Master"
==> Installed Extensions
guRoo | Type: Unknown | Repo: "https://github.com/aussieBIMguru/guRoo.git" | Installed: "D:\Software files\Revit\pyRevit plugins\guRoo.extension"
pyChai_dev | Type: UIExtension | Repo: "" | Installed: "D:\Code Development\Projects\BIM\Revit\pyChai\extensions\pyChai_dev.extension"
==> Default Extension Search Path
C:\Users\ACER\AppData\Roaming\pyRevit\Extensions
==> Extension Search Paths
D:\Code Development\Projects\BIM\Revit\pyChai\extensions
D:\Software files\Revit\pyRevit plugins
==> Extension Sources - Default
https://github.com/pyrevitlabs/pyRevit/raw/master/extensions/extensions.json
==> Extension Sources - Additional
==> Installed Revits
2027 | Version: 27.0.4.412 | Build: 20260228_1515(x64) | Language: 1033 | Path: "C:\Program Files\Autodesk\Revit 2027\"
2026 First Customer Ship | Version: 26.0.4.409 | Build: 20250227_1515(x64) | Language: 1033 | Path: "C:\Program Files\Autodesk\Revit 2026\"
2025 First Customer Ship | Version: 25.0.2.419 | Build: 20240307_1300(x64) | Language: 1033 | Path: "C:\Software installed\Autodesk\Revit 2025\"
2024.3.4 | Version: 24.3.40.26 | Build: 20250918_1515(x64) | Language: 1033 | Path: "C:\Software installed\Autodesk\Revit 2024\"
==> Running Revit Instances
Error: Object reference not set to an instance of an object.
Run with "--debug" option to see debug messages
4

For now, I have to use python subprocess as a workaround.

5

it seems the #! is ignored
please create an issue in the repo

1 Like
6

A little late to this but have you tried the WIP build from this issue?

1 Like
7

I guess this might be the issue.
One question though, do I have to uninstall existing stable version and install this WIP build? Or can I install alongside the stable version?

8

easiest would be to use the clone feature, if you’re comfortable with CLI

pyrevit clone dev --dest=“C:\pyRevit\dev” --branch=develop

and then attach the new clone via

pyrevit attach dev DEFAULT --installed

if a new WIP drops, you can then just

pyrevit clones update dev

1 Like
9

Oh nice! Will try this by upcoming weekend.

10

Sorry for delay in reply :sweat_smile:

  • In pyRevit 6.4.0, the problem was with #! python3 shebang.
  • In pyRevit 6.5.0, there was an issue where the changes made in the settings panel of pyRevit was not applying, causing the issue in loading of custom extensions. So, I reverted back to 6.4.0
  • In pyRevit 6.5.3, the issue partially resolved.

Now, I am facing the issue mentioned on Github . If there are multiple print statements in a script, only the 1st one gets executed. The code lines after the 1st print statement get ignored.

@Jean-Marc Thanks for replying on Github issue thread. Waiting for bug-fix :face_with_tongue: .