郭哲豪python輸入input尋找find沒找到-1

file = open('金融常識.txt','r',encoding='utf-8')
lines = file.readlines()
file.seek(0) 
reading = file.read() 
file.close()
print(len(lines), len(reading))
x = input('金一乙輸入搜尋關鍵詞，列出所有題目: ')
n = 0
for line in lines:
  if x in line: 
      n += 1 
      print(n, ' ',line,end="")
print(f'\n總共{n}題目')