如何在Maya 2015中让python重新加载此模块？构造函数仅在第一次运行时

Question

我遇到麻烦（我相信）在OSX 10.10上第一次在Maya 2015上运行后重新加载模块。它在重新启动应用程序后工作，但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，当前只有一个print语句，它只在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不起作用？第一次输出是：

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

从每一次执行的那一点开始，只需提供以下内容，直到我退出Maya并重新启动：

/Users/eric/Documents/Projects/RiggingTool

我尝试过使用：

import sys
sys.dont_write_bytecode = True

看它是否使用.pyc文件，但这没有任何区别。感谢。

Answer 1

在您的代码首次执行时，您的变量path尚未在sys.path中，因此，sys.path获得了path，您的模块将被导入并重新加载您的UI已执行。

在您的程序第二次执行时，path已经在sys.path您的if条件为False且内部代码未执行（无重新加载，无法调用您的UI）。

以下是您问题的可能解决方案：

注意： 以#1:开头的评论用于首次执行您的程序，而以#2:开头的评论则用于后续执行。

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()