[usdview] Support for pasting & executing multi-line text in python interpreter.

[moddyz]

Description of Issue

usdview is an excellent tool for presentations and developer iteration.

One feature which would be really nice to have is the ability to paste & execute multi-line python code into the interpreter.

Currently, the multi-line pastes are not executed.

Steps to Reproduce

1. cd to the root of the USD repository.
2. usdview ./pxr/usd/usdGeom/testenv/testUsdGeomSubset/Sphere.usda
3. Select the green, blue, and red GeomSubsets in the outliner.
4. Open python interpreter.
5. Copy the following multi-line text, paste into the interpreter, and hit return:

for prim in usdviewApi.selectedPrims:
    prim.GetAttribute('indices').Set([1,2,3])

6. The code will not be executed.

Workarounds

1. You can combine the code into 1 line.
2. For multiple lines: you can copy, paste, and execute one line at a time.

System Information (OS, Hardware)

Ubuntu-18.04

Package Versions

19.11

Build Flags

Dynamic build.

[jilliene]

Filed as internal issue #USD-5865