python 读取文件行

将文件转化成二进制码，并读取行数，计算总行数

 import os
 Str=input("请输入路径")
 Sum=0
 def read(Str):
     a = os.listdir(Str)
     b = []
     for i in a:
         b.append(os.path.join(Str, i))

     global Sum
     for i in b:
         if os.path.isfile(i):
             c = open(i, 'rb')
             Sum+=len(c.readlines())

         elif os.path.isdir(i):
             read(i)
     return Sum
 print(read(Str))