李剛佑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('李剛佑輸入搜尋關鍵詞: ')
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('李剛佑輸入搜尋關鍵詞: ')
n=int();n=0
for line in lines:
    if line.find(x) != -1:
        n=n+1 
        print(n," ",line,end=" ")
print("總共",n,"題")
  

file = open('金融常識.txt','r',encoding='utf-8')
lines = file.readlines()
file.close()
x = input('李剛佑輸入搜尋關鍵詞: ')
n=0
for line in lines:
    if x in line:
        n=n+1 
        print(n," ",line,end=" ")
print("總共",n,"題")
  

file = open('金融常識.txt','r',encoding='utf-8')
reading = file.read()
file.seek(0) #回到檔案的開始
lines = file.readlines()
file.close()
print('read()方法讀共', len(reading), 'readlines()方法讀共', len(lines))
x = input('李剛佑輸入搜尋關鍵詞: ')
n = 0
for line in lines:
    if x in line:
        n=n+1
        print( n, ' ', line,end='')
print("總共",n,"題")