如果是Python中的else

发布于 2024-11-26 06:26:41 字数 890 浏览 1 评论 0原文

我有以下函数，当我调用它时，它会打印出混乱的结果，但是如果 if 条件为 false，那么它不会进入 else 分支，我做错了什么？

def lidarMessageHandler( self, mess ):
        print( mess );
        #Check if I received the right command
        if( COMMANDTABLE[commandList[self.clientname]['lastcommand']]['id'] == mess['commandName'] ):
            print( 'if' )
            #Check if it's a blocking command            
            commandList[self.clientname]['isready'] = True
            if( self.start ):
                self.waitingForSettingsHandler( mess )
                return                           
        else:
            error = "I waited the answer for the following command %s but I received % command from %s " % self.lastCommand, mess['commandName'], self.clientname
            self.reiseError( error )
            isRunning[self.clientname] = False
            print( 'else' );

原文

I have the following function, when I call it's printing out the mess but if the if condition is false than it's not going the else branch, what I'm doing wrong?

def lidarMessageHandler( self, mess ):
        print( mess );
        #Check if I received the right command
        if( COMMANDTABLE[commandList[self.clientname]['lastcommand']]['id'] == mess['commandName'] ):
            print( 'if' )
            #Check if it's a blocking command            
            commandList[self.clientname]['isready'] = True
            if( self.start ):
                self.waitingForSettingsHandler( mess )
                return                           
        else:
            error = "I waited the answer for the following command %s but I received % command from %s " % self.lastCommand, mess['commandName'], self.clientname
            self.reiseError( error )
            isRunning[self.clientname] = False
            print( 'else' );

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始终不够 2024-12-03 06:26:41

您可能会在这里遇到异常：

error = "I waited the answer for the following command %s but I received % command from %s " % self.lastCommand, mess['commandName'], self.clientname
                                                                         ^

您应该添加 s:

error = "I waited the answer for the following command %s but I received %s command from %s " % self.lastCommand, mess['commandName'], self.clientname
                                                                         ^

（我假设 mess['commandName'] 是一个字符串）

You probably get an exception here:

error = "I waited the answer for the following command %s but I received % command from %s " % self.lastCommand, mess['commandName'], self.clientname
                                                                         ^

You should add s:

error = "I waited the answer for the following command %s but I received %s command from %s " % self.lastCommand, mess['commandName'], self.clientname
                                                                         ^

(I assume mess['commandName'] is a string)

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爱，才寂寞 2024-12-03 06:26:41

当 if 语句中的条件计算结果为 False 时，else 块肯定会被执行。是什么让你有不同的想法？

我怀疑您的代码引发了一个异常，您似乎在外部 try-except 块中忽略或沉默该异常。例如，该行将

error = "I waited the answer for the following command %s but I received % command from %s " % self.lastCommand, mess['commandName'], self.clientname

引发 TypeError，因为您传递了 3 个参数，但只有 2 个占位符，因为您似乎忘记了“I receive % command”附近的“s”。

When the condition in your if statement evaluates to False, the else block is most certainly executed. What makes you think otherwise?

I suspect that your code raises an exception that you seem to ignore or silence in an outer try-except block. For example, the line

error = "I waited the answer for the following command %s but I received % command from %s " % self.lastCommand, mess['commandName'], self.clientname

will raise a TypeError, since you are passing 3 arguments but only have 2 placeholders, as you seem to have forgotten the "s" near "I received % command".

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