如何在Maya 2015中获取Python重新加载此模块？ 构造函数仅在第一次运行

Question

我在模块首次在OS X 10.10的Maya 2015中运行后无法重装模块（我相信）。 重新启动应用程序后它可以工作，但是每次执行脚本时我都需要刷新它。 这是代码：

import os

try:
    riggingToolRoot = os.environ["RIGGING_TOOL_ROOT"]
except:
    print "RIGGING_TOOL_ROOT environment variable not correctly configured"
else:
    import sys 
    print riggingToolRoot
    path = riggingToolRoot + "/Modules"

    if not path in sys.path:
        sys.path.append(path)

        import System.blueprint_UI as blueprint_UI
        reload(blueprint_UI)

        UI = blueprint_UI.Blueprint_UI()

在Blueprint_UI的构造函数中，当前只有一条print语句，并且该语句仅在Maya重新启动后第一次运行脚本时运行。 似乎重新加载由于某种原因无法正常工作？ 第一次输出是：

/Users/eric/Documents/Projects/RiggingTool
We are in the constructor

从这一点开始，每次执行仅给出以下内容，直到我退出Maya并重新启动：

/Users/eric/Documents/Projects/RiggingTool

我试过使用：

import sys
sys.dont_write_bytecode = True

看看是否使用的是.pyc文件，但这没有任何区别。 谢谢。

Answer 1

在你的代码的第一次执行，你的变量path尚未在sys.path如此， sys.path获取与apprended path ，你的模块导入和重载和您的用户界面执行。

在程序的第二次执行中， if条件为False且path不在sys.path并且内部代码未执行（不重新加载，不调用UI）。

这是您的问题的可能解决方案：

注意：以#1:开头的注释用于程序的第一次执行，而以#2:开头的注释用于后续的执行。

import os

try:
    riggingToolRoot = os.environ["RIGGING_TOOL_ROOT"] #I guess this is the beginning of your path where blueprint is located
except:
    print "RIGGING_TOOL_ROOT environment variable not correctly configured"
else:
    import sys 

    print riggingToolRoot  #This will be printed in both cases
    path = riggingToolRoot + "/Modules"

    #1: path is not yet in sys.path, condition True
    #2: we previously addded path to sys.path and it will stay like this until we restart Maya, condition False. path will not be appended to sys.path a second time, this is useless
    if not path in sys.path:
        sys.path.append(path)


    if not "System.blueprint_UI" in sys.modules:
        #1: We never imported System.blueprint_UI 
        #1: Let's do it
        #1: Note that blueprint_UI is just a local variable, it is not stored anywhere in sys.modules 
        import System.blueprint_UI as blueprint_UI
    else:
        #2: When you import a module, it is located in sys.modules
        #2: Try printing it, your can see all the modules already imported (Maya has quite a lot) 
        #2: Anyway, the condition is False as the module has been imported previously
        reload(blueprint_UI)

    #In both case, the module is imported and updated, we can now run the UI function and print "We are in the constructor"
    UI = blueprint_UI.Blueprint_UI()