Python實現把回車符rn轉換成n

import os

def replace(filePath, w2u):
 try:
 oldfile = open(filePath, "rb+") #這里必須用b打開
 path, name = os.path.split(filePath)
 newfile = open(path + '$' + name, "ba+")
 
 old = b''
 new = b''
 if w2u == True:
 old = b'
'
 new = b''
 else:
 old = b'
'
 new = b'
'

 data = b''
 while (True):
 data = oldfile.read(200)
 newData = data.replace(old, new)
 newfile.write(newData)
 if len(data) < 200:
 break
 newfile.close()
 oldfile.close()
 
 os.remove(filePath)
 os.rename(path + '$' + name, filePath)
 except IOError as e:
 print(e)
 
if __name__ == "__main__":
 print("請輸入文件路徑：")
 filePath = input()
 replace(filePath, False) #這個改為True就可以實現
變成