python扫描TXT文件，提取关键字，追加到新列表

f = open('SelfCheck.Log', 'r')
txt_content = f.read()
changeline_num = txt_content.count('\n')
f.close()
f = open('SelfCheck.Log', 'r')
txt_content = f.readlines()
# print(txt_content)
# print(changeline_num)
# print(type(txt_content))
i = 0
list = []
while i < (changeline_num):
    str = txt_content[i]
    # print(str)
    if 'Status: 100' in str:
        list.append(str)

    i += 1

print(len(list))

f.close()