def check_file(filename, content):
    with open(filename, encoding=‘utf-8‘) as f:
        for i in f:
            if content in i:
                yield i


g = check_file(‘file‘, ‘火‘)
for i in g:
    print(i.strip())

def generator():
    with open(‘file‘, encoding=‘utf-8‘) as f:
        for i in f:
            yield ‘***‘ + i


g = generator()
for i in g:
    print(i.strip())

li = [1, 2, 3, 4, 2, 5, 4, 8]
lis = []
for i in li:
    if i not in lis:
        lis.append(i)

li = lis
print(li)

num_1 = 1  # 第一个数
num_2 = 1  # 第二个数
count = 2
while num_1 + num_2 < 4000000:
    sum = num_1 + num_2  # 前两个数之和等于第三个数
    num_1 = num_2  # 把第二个数赋值给num_1
    num_2 = sum  # 把第三个数赋值给num_2
    count += 1

print(‘400万以内最大的斐波那契数是{},它是第{}个斐波那契数‘.format(sum, count))

price = int(input(‘please tell me goods price:‘))
if price >= 50 and price <= 100:
    print(‘您的商品打9折，你需要支付{}元‘ .format(price * 0.9))
elif price > 100:
    print(‘您的商品打8折，你需要支付{}元‘ .format(price * 0.8))
else:
    print(‘你需要支付{}元‘ .format(price))