用正则方法实现统计e:\\python文件中指定字符如"python"的个数?（文件中的python字符）

import re

op = open(r'D:\test\test.txt','r')
read = op.readlines()  #列表显示所有内容
num = 0
for i in read:
    cc = i.strip('\n')  #去掉换行
    # print(cc)
    all = re.findall('python',cc)  #用正则表达式找字符'python'
    for i in all:
        num = num+1
print(num)