Analyze the reason for the error No Such File or DIr when using python's open function

我写的代码如下：

def createFileWithFileName(localPathParam,fileName): 
    totalPath=local_url+'\\'+fileName 
    if not os.path.exists(totalPath):
        print totalPath 
        file=open(totalPath,'w+') 
        file.close() 
        return totalPath

起初时local_url使用的是绝对路径：F：程序名/imgs

但是了程序一直报No such file or dir的错，后来发现只要换为相对路径即可，

../imgs，程序运行成功

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