初學Python常見的錯誤

1. TypeError: coercing to Unicode: need string or buffer, type found

Traceback (most recent call last):  File "unzip.py", line 20, in <module>    tar = tarfile.open(file)  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/tarfile.py", line 1658, in open    return func(name, "r", fileobj, **kwargs)  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/tarfile.py", line 1720, in gzopen    fileobj = bltn_open(name, mode + "b")TypeError: coercing to Unicode: need string or buffer, type found

代碼為：

#掃描當前目前下所有的gz檔案currDir = os.getcwd()files = os.listdir(currDir)dstDir = "201301_09"if not os.path.exists(dstDir):    os.mkdir(dstDir)for fileName in files:    if os.path.isfile(fileName) and tarfile.is_tarfile(fileName):        print fileName        try:            tar = tarfile.open(file)#這裡應該是fileName而不是file            names = tar.getnames()            for name in names:                tar.extract(name,path=dstDir)            tar.close()        except tarfile.ReadError:            print "not a tarFile"            pass