28 python 序列的乘法（字符串乘法）检查某个值是否属于一个序列 求序列的长度、最大值和最小值

s = "a"
print(s * 12) # aaaaaaaaaaaa

numbers = [1,2,3,4,5]
print(numbers * 3) # [1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5]

# 打印正三角 * 号的功能
‘‘‘
[‘ ‘, ‘ ‘, ‘ ‘, ‘ ‘, ‘ ‘, ‘*‘, ‘ ‘, ‘ ‘, ‘ ‘, ‘ ‘, ‘ ‘]
[‘ ‘, ‘ ‘, ‘ ‘, ‘ ‘, ‘*‘, ‘*‘, ‘*‘, ‘ ‘, ‘ ‘, ‘ ‘, ‘ ‘]
[‘ ‘, ‘ ‘, ‘ ‘, ‘*‘, ‘*‘, ‘*‘, ‘*‘, ‘*‘, ‘ ‘, ‘ ‘, ‘ ‘]
[‘ ‘, ‘ ‘, ‘*‘, ‘*‘, ‘*‘, ‘*‘, ‘*‘, ‘*‘, ‘*‘, ‘ ‘, ‘ ‘]
[‘ ‘, ‘*‘, ‘*‘, ‘*‘, ‘*‘, ‘*‘, ‘*‘, ‘*‘, ‘*‘, ‘*‘, ‘ ‘]
[‘*‘, ‘*‘, ‘*‘, ‘*‘, ‘*‘, ‘*‘, ‘*‘, ‘*‘, ‘*‘, ‘*‘, ‘*‘]
‘‘‘

spaceNum = 5
i = 1
lineSpaceNum =spaceNum # 表示当前行的前后空格数
triangle = [] # 二维列表
# 开始生产三角形
while lineSpaceNum >= 0:
# 生成星号左侧空格列表
leftSpaceList = [‘ ‘] * lineSpaceNum
# 生成星号列表
starList = [‘*‘] * (2 * i - 1)
# 生成星号右侧空格列表
rightSpaceList = [‘ ‘] * lineSpaceNum
# 生成每一行的列表
lineList = leftSpaceList + starList + rightSpaceList
triangle.append(lineList)
lineSpaceNum -= 1
i += 1
for line in triangle:
print(line)

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第五课：检查某个值(字符串或者是字母 单词)是否属于一个序列
# 检查某个值是否属于一个序列

# in运算符：返回布尔类型值 True False

s = "I love python."
print("python" in s) # True
print("you" in s) # False
print("p" in s) # True

values = ["Bill", False, 20]
print("Bill" in values) # True
print(False in values) # True
print(True in values) # False
print(20 in values) # True

# 定一个 2维列表的
account = [
["geekori","123456"],
["bill", "54321"],
["superman", 456]
]
username = input("账号：")
password = input("密码：")
if [username, password] in account:
print("登录成功！")
else:
print("登录失败,请检查用户名和密码是否正确")

# 其实这一块 还可以做一个有意思的 事 就是 去判断 到底是用户名错了 还是 密码错了 这样可以定位到问题
//这一部分到代码 在研究中
用Python编写账号密码登录程序 https://blog.csdn.net/weixin_44784939/article/details/89364732

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第6课：求序列的长度、最大值和最小值
# 序列的长度、最大值和最小值

values = [int("3"),True,10,54,23,-56,64,12,86,10.4]
print(len(values)) # 此序列的长度为 10
print(max(values)) # 此序列的最大值为 86
print(min(values)) # 此序列的最小值 -56