我正在研究第6章中Mark Pilgrim的Dive Into
Python Book的模块,我对这行代码返回[fileList中的f]的getFileInfoClass(f)(f)的确如此. getFileInfo是一个嵌套函数,我想知道什么是重复(f),额外的括号是.我希望有人可以帮助我.这是完整的功能：
def listDirectory(directory,fileExtList):
"get list of file info objects for files of particular extensions"
fileList = [os.path.normcase(f) for f in os.listdir(directory)]
fileList = [os.path.join(directory,f) for f in fileList \
if os.path.splitext(f)[1] in fileExtList]
def getFileInfoClass(filename,module=sys.modules[FileInfo.__module__]):
"get file info class from filename extension"
subclass = "%sFileInfo" % os.path.splitext(filename)[1].upper()[1:]
return hasattr(module,subclass) and getattr(module,subclass) or FileInfo
return [getFileInfoClass(f)(f) for f in fileList]