陳思听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.close()
x = input('陳思听輸入搜尋關鍵詞: ')
n=0
for line in lines:
 if line.find(x) != -1: print(line,end="")

file = open('金融常識.txt','r',encoding='utf-8')
lines = file.readlines()
file.close()
x = input('陳思听輸入搜尋關鍵詞: ')
n=0
for line in lines:
 if line.find(x) != -1:
    n=n+1
    print(line,end='')
print(f'總共{n}題')

file = open('金融常識.txt','r',encoding='utf-8')
reading=file.read()
lines = file.readlines()
file.close()
x = input('陳思听輸入搜尋關鍵詞: ')
n=0
for line in lines:
 if x in line:
    n=n+1
    print( n , ' ', line,end='')
print(f'總共{n}題')