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os.getcwd()£º»ñµÃµ±Ç°¹¤×÷Ŀ¼
os.curdir:·µ»Øµ±Ç°Ä¿Â¼£¨'.')
os.chdir(dirname):¸Ä±ä¹¤×÷Ŀ¼µ½dirname
os.path.isdir(name):ÅжÏnameÊDz»ÊÇÒ»¸öĿ¼£¬name²»ÊÇĿ¼¾Í·µ»Øfalse
os.path.isfile(name):ÅжÏnameÊDz»ÊÇÒ»¸öÎļþ£¬²»´æÔÚnameÒ²·µ»Øfalse
os.path.exists(name):ÅжÏÊÇ·ñ´æÔÚÎļþ»òĿ¼name
os.path.getsize(name):»ñµÃÎļþ´óС£¬Èç¹ûnameÊÇĿ¼·µ»Ø0
os.path.abspath(name):»ñµÃ¾ø¶Ô·¾¶
os.path.normpath(path):¹æ·¶path×Ö·û´®ÐÎʽ
os.path.split(name):·Ö¸îÎļþÃûÓëĿ¼£¨ÊÂʵÉÏ£¬Èç¹ûÄãÍêȫʹÓÃĿ¼£¬ËüÒ²»á½«×îºóÒ»¸öĿ¼×÷ΪÎļþÃû¶ø·ÖÀ룬ͬʱËü²»»áÅжÏÎļþ»òĿ¼ÊÇ·ñ´æÔÚ£©
os.path.splitext():·ÖÀëÎļþÃûÓëÀ©Õ¹Ãû
os.path.join(path,name):Á¬½ÓĿ¼ÓëÎļþÃû»òĿ¼
os.path.basename(path):·µ»ØÎļþÃû
os.path.dirname(path):·µ»ØÎļþ·¾¶ 
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import os,sys
def listdir(dir,file):
    file.write(dir + '\n')
    fielnum = 0
    list = os.listdir(dir)  #ÁгöĿ¼ÏµÄËùÓÐÎļþºÍĿ¼
    for line in list:
        filepath = os.path.join(dir,line)
        if os.path.isdir(filepath):  #Èç¹ûfilepathÊÇĿ¼£¬ÔòÔÙÁгö¸ÃĿ¼ÏµÄËùÓÐÎļþ
            myfile.write('   ' + line + '\\'+'\n')
            for li in os.listdir(filepath):
                myfile.write('     '+li + '\n')
                fielnum = fielnum + 1
        elif os.path:   #Èç¹ûfilepathÊÇÎļþ


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