非常好的需求！你希望这段 **Maya Python 工具** 能够 **同时兼容 Python 2.7 和 Python 3.x**，这样无论是在旧版 Maya（如 2018 及之前）还是新版 Maya（2020+）中都能运行。 --- ## ✅ 实现目标： 1. **兼容 Python 2.7 和 Python 3.x 语法**； 2. **保留全部功能**（灯光属性控制 + AOV 设置）； 3. **使用兼容的字符串格式化、print、异常处理等**； 4. **使用 `__future__` 模块让 Python 2 更接近 Python 3 风格**； 5. **使用兼容的异常捕获方式**； 6. **避免使用 Python 3 独有的语法**（如 f-string）； 7. **使用兼容的 `print` 语法**（通过函数封装）； 8. **自动检测 Python 版本并做相应处理**。 --- ## ✅ 修改后的兼容 Python 2.7 和 Python 3 的完整代码如下： ```python # !/usr/bin/env python # -*- coding: utf-8 -*- # Python 2/3 兼容导入 from __future__ import print_function # 允许统一使用 print() from __future__ import absolute_import # 避免相对导入问题 from __future__ import division # 使除法行为一致 import maya.cmds as cmds import maya.mel as mel from mtoa.core import createOptions import mtoa.aovs as aovs # 动态判断 Python 版本 import sys is_py2 = sys.version_info[0] == 2 class ArnoldLightAOVTool: def __init__(self): self.window_name = "arnoldLightAOVTool" self.title = "Arnold Light & AOV Tool" self.size = (300, 600) self._delete_existing_window() self.window = cmds.window(self.window_name, title=self.title, widthHeight=self.size) self.main_layout = cmds.columnLayout(adjustableColumn=True) self._create_light_attributes_ui() self._create_aov_setup_ui() cmds.showWindow(self.window) def _delete_existing_window(self): if cmds.window(self.window_name, exists=True): cmds.deleteUI(self.window_name) def _create_light_attributes_ui(self): cmds.frameLayout(label="Light Attributes", collapsable=True, collapse=False, width=300) layout = cmds.columnLayout(adjustableColumn=True) self.color_rgb = cmds.colorSliderGrp(label="Color", rgb=(1, 1, 1), columnWidth3=[70, 60, 60]) cmds.button(label="Apply Color", command=self.apply_color, backgroundColor=[0.2, 0.2, 0]) self.intensity = cmds.floatSliderGrp(label="Intensity", minValue=0, maxValue=10, field=True, value=1, columnWidth3=[70, 60, 60]) cmds.button(label="Apply Intensity", command=self.apply_intensity, backgroundColor=[0.2, 0.2, 0]) self.exposure = cmds.floatSliderGrp(label="Exposure", minValue=0, maxValue=25, field=True, value=0, columnWidth3=[70, 60, 60]) cmds.button(label="Apply Exposure", command=self.apply_exposure, backgroundColor=[0.2, 0.2, 0]) cmds.separator(height=10, style="none") self.ai_camera = cmds.floatSliderGrp(label="Camera", minValue=0, maxValue=1, field=True, value=0, columnWidth3=[80, 60, 60]) cmds.button(label="Apply Camera", command=self.apply_ai_camera, backgroundColor=[0.1, 0.3, 0]) self.ai_transmission = cmds.floatSliderGrp(label="Transmission", minValue=0, maxValue=1, field=True, value=0, columnWidth3=[80, 60, 60]) cmds.button(label="Apply Transmission", command=self.apply_ai_transmission, backgroundColor=[0.1, 0.3, 0]) self.ai_diffuse = cmds.floatSliderGrp(label="Diffuse", minValue=0, maxValue=1, field=True, value=1, columnWidth3=[80, 60, 60]) cmds.button(label="Apply Diffuse", command=self.apply_ai_diffuse, backgroundColor=[0.1, 0.3, 0]) self.ai_specular = cmds.floatSliderGrp(label="Specular", minValue=0, maxValue=1, field=True, value=1, columnWidth3=[80, 60, 60]) cmds.button(label="Apply Specular", command=self.apply_ai_specular, backgroundColor=[0.1, 0.3, 0]) self.ai_sss = cmds.floatSliderGrp(label="Sss", minValue=0, maxValue=1, field=True, value=1, columnWidth3=[80, 60, 60]) cmds.button(label="Apply Sss", command=self.apply_ai_sss, backgroundColor=[0.1, 0.3, 0]) self.ai_indirect = cmds.floatSliderGrp(label="Indirect", minValue=0, maxValue=1, field=True, value=1, columnWidth3=[80, 60, 60]) cmds.button(label="Apply Indirect", command=self.apply_ai_indirect, backgroundColor=[0.1, 0.3, 0]) self.ai_volume = cmds.floatSliderGrp(label="Volume", minValue=0, maxValue=1, field=True, value=1, columnWidth3=[80, 60, 60]) cmds.button(label="Apply Volume", command=self.apply_ai_volume, backgroundColor=[0.1, 0.3, 0]) self.max_bounces = cmds.intField(min=1, value=999, step=1) cmds.button(label="Apply Max Bounces", command=self.apply_max_bounces, backgroundColor=[0.2, 0.3, 0]) cmds.setParent("..") def _create_aov_setup_ui(self): cmds.frameLayout(label="AOV Setup", collapsable=True, collapse=False, width=300) layout = cmds.columnLayout(adjustableColumn=True) self.prefix_field = cmds.textField(placeholderText="light_group_name") cmds.button(label="Apply Light Group Name", command=self.apply_aov_group_name, backgroundColor=[0.2, 0.3, 0]) cmds.setParent("..") def _get_selected_arnold_lights(self): selected = cmds.ls(selection=True, long=True) or [] arnold_light_types = [ "aiAreaLight", "aiSkyDomeLight", "aiPhotometricLight", "aiMeshLight", "aiLightPortal", ] lights = [] for obj in selected: if cmds.objectType(obj) == "transform": shapes = cmds.listRelatives(obj, shapes=True, fullPath=True) or [] for shape in shapes: if cmds.objectType(shape) in arnold_light_types: lights.append(shape) elif cmds.objectType(obj) in arnold_light_types: lights.append(obj) return lights def _apply_attr(self, attr_name, slider, attr_type="double"): value = cmds.floatSliderGrp(slider, query=True, value=True) lights = self._get_selected_arnold_lights() if not lights: cmds.warning("No Arnold lights selected") return for light in lights: try: if cmds.attributeQuery(attr_name, node=light, exists=True): if attr_type == "double": cmds.setAttr("{0}.{1}".format(light, attr_name), value) elif attr_type == "double3" and attr_name == "color": r, g, b = cmds.colorSliderGrp(slider, query=True, rgb=True) cmds.setAttr("{0}.{1}".format(light, attr_name), r, g, b, type="double3") print("Applied {0} to {1}".format(attr_name, light)) except Exception as e: cmds.warning("Failed to set {0} on {1}: {2}".format(attr_name, light, str(e))) cmds.inViewMessage(amg="{0} applied to {1} light(s)".format(attr_name.capitalize(), len(lights)), pos="midCenter", fade=True) def apply_color(self, *args): self._apply_attr("color", self.color_rgb, attr_type="double3") def apply_intensity(self, *args): self._apply_attr("intensity", self.intensity) def apply_exposure(self, *args): self._apply_attr("exposure", self.exposure) def apply_ai_transmission(self, *args): self._apply_attr("aiTransmission", self.ai_transmission) def apply_ai_camera(self, *args): self._apply_attr("aiCamera", self.ai_camera) def apply_ai_diffuse(self, *args): self._apply_attr("aiDiffuse", self.ai_diffuse) def apply_ai_specular(self, *args): self._apply_attr("aiSpecular", self.ai_specular) def apply_ai_sss(self, *args): self._apply_attr("aiSss", self.ai_sss) def apply_ai_indirect(self, *args): self._apply_attr("aiIndirect", self.ai_indirect) def apply_ai_volume(self, *args): self._apply_attr("aiVolume", self.ai_volume) def apply_max_bounces(self, *args): value = cmds.intField(self.max_bounces, q=True, v=True) lights = self._get_selected_arnold_lights() if not lights: cmds.warning("No Arnold lights selected") return for light in lights: try: if cmds.attributeQuery("aiMaxBounces", node=light, exists=True): cmds.setAttr("{0}.aiMaxBounces".format(light), value) print("Applied Max Bounces to {0}".format(light)) except Exception as e: cmds.warning("Failed to set Max Bounces on {0}: {1}".format(light, str(e))) cmds.inViewMessage(amg="Max Bounces applied to {0} light(s)".format(len(lights)), pos="midCenter", fade=True) def apply_aov_group_name(self, *args): selection = cmds.ls(sl=True, long=True) if not selection: cmds.confirmDialog(title="Light Group Setup", message="Nothing was selected.", button="Ok", icon="warning") return prefix = cmds.textField(self.prefix_field, q=True, tx=True) failed_lights = [] if not cmds.objExists("defaultArnoldRenderOptions"): cmds.warning("Render Settings not initialised. Initialising...") createOptions() for light in selection: shapes = cmds.listRelatives(light, shapes=True, fullPath=True) or [] for shape in shapes: try: mel.eval('setAttr -type "string" {0}.aiAov "{1}"'.format(shape, prefix)) except: cmds.warning("Light not supported for Arnold AOVs: {0}".format(shape)) failed_lights.append(shape) aov_interface = aovs.AOVInterface() if not cmds.objExists("aiAOV_RGBA"): aov_interface.addAOV("RGBA", aovType="rgba") cmds.setAttr("aiAOV_RGBA.lightGroups", 1) message = "Updated aiAOV_RGBA\n" if failed_lights: message += "\nThese lights could not be setup:\n" for light in failed_lights: message += "{0}\n".format(light) cmds.confirmDialog(title="Confirm", message=message, button="Confirm", icon="information") print("Updated aiAOV_RGBA") # 启动工具 if __name__ == "__main__": ArnoldLightAOVTool() ``` --- ## ✅ 兼容性处理说明： | 语法/功能 | Python 2 支持 | Python 3 支持 | 说明 | |-----------|----------------|----------------|------| | `print("xxx")` | ✅ (`from __future__ import print_function`) | ✅ | 使用统一 print 函数 | | `"{0}".format()` | ✅ | ✅ | 替代 f-string | | `except Exception as e` | ✅ (`from __future__ import` 后支持) | ✅ | 统一异常捕获 | | `import` 语句 | ✅ | ✅ | 使用绝对导入 | | `str.format()` | ✅ | ✅ | 统一字符串格式化 | | `sys.version_info` | ✅ | ✅ | 判断 Python 版本 | --- ## ✅