Add Houdini py7 support

Author: LucaScheller

CMakeLists.txt

@@ -114,6 +114,9 @@ if("$ENV{AR_DCC_NAME}" STREQUAL "HOUDINI")
         elseif(EXISTS "${AR_HOUDINI_ROOT}/python/bin/python3.9")
             set(AR_PYTHON_LIB python3.9)
             set(AR_PYTHON_LIB_NUMBER python39)
+        elseif(EXISTS "${AR_HOUDINI_ROOT}/python/bin/python3.7m")
+            set(AR_PYTHON_LIB python3.7m)
+            set(AR_PYTHON_LIB_NUMBER python37)
         else()
             set(AR_PYTHON_LIB python3.7)
             set(AR_PYTHON_LIB_NUMBER python37)

docs/src/resolvers/CachedResolver/example.md

@@ -185,7 +185,7 @@ class ResolverContext:
             re-applies the correct mapping. If the identifier is encountered again it will use the C++ cache, which means everything is kept fast.
             """
             #######
-            base_identifier = assetPath.removeprefix(RELATIVE_PATH_IDENTIFIER_PREFIX)
+            base_identifier = assetPath[len(RELATIVE_PATH_IDENTIFIER_PREFIX):]
             anchor_path, entity_element = base_identifier.split("?")
             entity_type, entity_identifier = anchor_path.split("/")
             entity_element, entity_version = entity_element.split("-")

files/implementations/CachedResolver/code/PythonExpose.py

@@ -119,7 +119,7 @@ def ResolveAndCache(context, assetPath):
         )
         resolved_asset_path = ""
         if assetPath.startswith(RELATIVE_PATH_IDENTIFIER_PREFIX):
-            base_identifier = assetPath.removeprefix(RELATIVE_PATH_IDENTIFIER_PREFIX)
+            base_identifier = assetPath[len(RELATIVE_PATH_IDENTIFIER_PREFIX):]
             anchor_path, entity_element = base_identifier.split("?")
             entity_type, entity_identifier = anchor_path.split("/")
             entity_element, entity_version = entity_element.split("-")

src/CachedResolver/PythonExpose.py

@@ -126,8 +126,11 @@ def ResolveAndCache(context, assetPath):
             asset_b_file_path = os.path.join(current_dir_path, "assetB.usd")
             context.AddCachingPair("assetA.usd", asset_a_file_path)
             context.AddCachingPair("assetB.usd", asset_b_file_path)
-        if assetPath.startswith("relativePath|"):
-            relative_path, anchor_path = assetPath.removeprefix("relativePath|").split("?")
+        relative_path_prefix = "relativePath|"
+        if assetPath.startswith(relative_path_prefix):
+            relative_path, anchor_path = assetPath[len(relative_path_prefix) :].split(
+                "?"
+            )
             anchor_path = anchor_path[:-1] if anchor_path[-1] == "/" else anchor_path[:anchor_path.rfind("/")]
             resolved_asset_path = os.path.normpath(os.path.join(anchor_path, relative_path))
             context.AddCachingPair(assetPath, resolved_asset_path)