Python NameError: name '__main__' 未定义
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NameError: name '__main__' is not defined
提问by arvidurs
I have been reading here, but I couldnt find any solution online to solve my problem..I think I have the indentation right, but I still get the Name Error..Can someone help me out please. This script should run a new panel in maya, which works kind of, but the error is really annoying.
我一直在这里阅读，但我无法在网上找到任何解决方案来解决我的问题。这个脚本应该在 Maya 中运行一个新面板，它可以工作，但错误真的很烦人。
class PanelWindow( object ):
def __init__( self, name, title, namespace=__name__ ):
self.__name__ = name
self._title = title
self.instance = str(namespace) + '.' + self.__name__
if not pm.scriptedPanelType(self.__name__, q = True, ex = True):
pm.scriptedPanelType(self.__name__, u = True)
jobCmd = 'python(\\"%s._setup()\\")' % self.instance
job = "scriptJob -replacePrevious -parent \"%s\" -event \"SceneOpened\" \"%s\";" % ( self.__name__, jobCmd )
mel.eval(job)
pm.scriptedPanelType( self.__name__, e = True,
unique=True,
createCallback = 'python("%s._createCallback()")' % self.instance,
initCallback = 'python("%s._initCallback()" )' % self.instance,
addCallback = 'python("%s._addCallback()" )' % self.instance,
removeCallback = 'python("%s._removeCallback()")' % self.instance,
deleteCallback = 'python("%s._deleteCallback()")' % self.instance,
saveStateCallback = 'python("%s._deleteCallback()")' % self.instance
)
def _setup(self):
"""Command to be call for new scene"""
panelName = pm.sceneUIReplacement( getNextScriptedPanel=(self.__name__, self._title) )
if panelName == '':
try:
panelName = pm.scriptedPanel( mbv=1, unParent=True, type=self.__name__, label=self._title )
except:
pass
else:
try:
label = panel( self.__name__, query=True, label=True )
pm.scriptedPanel( self.__name__, edit=True, label=self._title )
except:
pass
def _addCallback(self):
"""Create UI and parent any editors."""
print 'ADD CALLBACK'
def show( self ):
mel.eval('tearOffPanel "%s" %s true;' % (self._title, self.__name__) )
global test
test = PanelWindow('myName', 'Light')
test.show()
# NameError: name '__main__' is not defined #
# Error: line 1: name '__main__' is not defined
# Traceback (most recent call last):
# File "<maya console>", line 1, in <module>
# NameError: name '__main__' is not defined #
采纳答案by Shannon Hochkins
Your problem was a few things, I've only included a few basic sections of the code as the rest wasn't needed.
您的问题是几件事，我只包含了代码的几个基本部分，因为其余部分不需要。
Problem one was __name__, if this were quoted, we wouldn't have a problem, seeing as it's just a name and not anything special, I'm just going to rename this to name.
问题一是__name__，如果引用它，我们就不会有问题，因为它只是一个名称而不是任何特殊的东西，我只是将它重命名为name.
Problem two was duplicate names on panels/panelTypes. IE:
问题二是面板/面板类型上的重复名称。IE：
pm.scriptedPanelType(self.__name__, u = True)
pm.scriptedPanel( self.__name__, edit=True, label=self._title )
Maya didn't like that both the panelType and the panel had the same names.
Maya 不喜欢 panelType 和面板具有相同的名称。
So:
所以：
import maya.cmds as cmds
import pymel.core as pm
import maya.mel as mel
class PanelWindow( object ):
def __init__(self, name, title):
self._name = name
self._title = title
self.panelTypeName = self._name + "Type"
if not pm.scriptedPanelType(self.panelTypeName, query=True, exists=True):
pm.scriptedPanelType(self.panelTypeName, unique=True)
if not pm.scriptedPanel(self._title, query=True, exists=True):
## Only allows one instance
pm.scriptedPanel(self._title, menuBarVisible=1, unParent=True, type=self.panelTypeName, label=self._title )
def _addCallback(self):
"""Create UI and parent any editors."""
print 'ADD CALLBACK'
def show( self ):
mel.eval('tearOffPanel "%s" "%s" true;' % (self._title, self._name) )
PanelWindow('lightControlType1', 'lightControl').show()
回答by Peter Gibson
When executing Python scripts, the Python interpreter sets a variable called __name__to be the string value "__main__"for the module being executed (normally this variable contains the module name).
在执行 Python 脚本时，Python 解释器会设置一个变量，称为正在执行的模块__name__的字符串值"__main__"（通常这个变量包含模块名称）。
It is common to check the value of this variable to see if your module is being imported for use as a library, or if it is being executed directly. So you often see this block of code at the end of modules:
检查这个变量的值是很常见的，看看你的模块是否被导入用作库，或者它是否被直接执行。所以你经常会在模块的末尾看到这段代码：
if __name__ == '__main__':
# do stuff
I suspect you have left the string quotes off of '__main__'which gives the NameError you're seeing
我怀疑你已经离开了字符串引号，'__main__'它给出了你看到的 NameError
>>> if __name__ == __main__:
... pass
...
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name '__main__' is not defined
