python讀取Unicode和ANSI編碼的檔案

最近需要操作inf格式文檔，用原本的文本讀取方式不成功，於是搜尋了一下找到原因。需要讀取的目錄下的檔案有兩種編碼方式，一種是ANSI，另外一種是Unicode，但是Unicode的儲存方式有UTF-8，UTF-16等，UTF即為Unicode Translation Format，就是把Unicode轉做某種格式的意思。讀取Unicode編碼方式的文本時需要標明其儲存方式，否則會出錯。

如下代碼可以讀取指定目錄下面以"test"為首碼以".txt"為尾碼的文字檔(檔案可以存在子目錄下)，搜尋到其中是否含有"done"字串，若有則輸出其檔案夾路徑，其完整路徑還有含有該字串的行。搜尋完畢後將搜尋到的檔案完整路徑存在一個list中並再次輸出。

import os.pathimport codecsrootdir = "C:\\test\\code_python\\testfile"def lookupstring(lookup):    filelist = []    judge = False    for parent, dirnames, filenames in os.walk(rootdir):        for filename in filenames:            if filename.startswith("test") and filename.endswith(".txt"):                try:                    f = codecs.open(os.path.join(parent, filename), 'r', 'utf-16')                    ls = [ line.strip() for line in f]                    for line in ls:                        if not line.find(lookup) == -1:                            print "parent is:" + parent                            print "filename with full path :" + os.path.join(parent, filename)                            print line                            judge = True                    if judge == True:                        filelist.append(os.path.join(parent, filename))                    judge = False                    f.close()                except:                    f.close()                    f = open(os.path.join(parent, filename), 'r')                    ls = f.readlines()                    for line in ls:                        if not line.find(lookup) == -1:                            print "parent is:" + parent                            print "filename with full path :" + os.path.join(parent, filename)                            print line                            judge = True                    if judge == True:                        filelist.append(os.path.join(parent, filename))                    judge = False                    f.close()    return filelist                    def main():    test = lookupstring("done")    for element in test:        print elementif __name__ == '__main__':    main()