s1 = 'hello ' * 3
print(s1) # hello hello hello 
s2 = 'world'
s1 += s2
print(s1) # hello hello hello world
print('ll' in s1) # True
print('good' in s1) # False
str2 = 'abc123456'
# 从字符串中取出指定位置的字符(下标运算)
print(str2[2]) # c
# 字符串切片(从指定的开始索引到指定的结束索引)
print(str2[2:5]) # c12
print(str2[2:]) # c123456
print(str2[2::2]) # c246
print(str2[::2]) # ac246
print(str2[::-1]) # 654321cba
print(str2[-3:-1]) # 45

#%%
str1 = 'hello, world!'
# 通过内置函数len计算字符串的长度
print(len(str1)) # 13
# 获得字符串首字母大写的拷贝
print(str1.capitalize()) # Hello, world!
# 获得字符串每个单词首字母大写的拷贝
print(str1.title()) # Hello, World!
# 获得字符串变大写后的拷贝
print(str1.upper()) # HELLO, WORLD!
# 从字符串中查找子串所在位置
print(str1.find('or')) # 8
print(str1.find('shit')) # -1
# 与find类似但找不到子串时会引发异常
# print(str1.index('or'))
# print(str1.index('shit'))
# 检查字符串是否以指定的字符串开头
print(str1.startswith('He')) # False
print(str1.startswith('hel')) # True
# 检查字符串是否以指定的字符串结尾
print(str1.endswith('!')) # True
# 将字符串以指定的宽度居中并在两侧填充指定的字符
print(str1.center(50, '*'))
# 将字符串以指定的宽度靠右放置左侧填充指定的字符
print(str1.rjust(50, ' '))
str2 = 'abc123456'
# 检查字符串是否由数字构成
print(str2.isdigit())  # False
# 检查字符串是否以字母构成
print(str2.isalpha())  # False
# 检查字符串是否以数字和字母构成
print(str2.isalnum())  # True
str3 = '  jackfrued@126.com '
print(str3)
# 获得字符串修剪左右两侧空格之后的拷贝
print(str3.strip())

# %%
def fib(n):
    a, b = 0, 1
    for _ in range(n):
        a, b = b, a + b
        yield a


def main():
    for val in fib(20):
        print(val)


if __name__ == '__main__':
    main()

# %%
t = ('骆昊', 38, True, '四川成都')
# 遍历元组中的值
for member in t:
    print(member)
# 重新给元组赋值
# t[0] = '王大锤'  # TypeError
# 变量t重新引用了新的元组原来的元组将被垃圾回收
t = ('王大锤', 20, True, '云南昆明')
print(t)
# 将元组转换成列表
person = list(t)
print(person)
# 列表是可以修改它的元素的
person[0] = '李小龙'
person[1] = 25
print(person)
# 将列表转换成元组
fruits_list = ['apple', 'banana', 'orange']
fruits_tuple = tuple(fruits_list)
print(fruits_tuple)
#%%
import sys

list2 = []
tuple2 = ()
str = 'Magical Line'
print(sys.getsizeof(list2))
print(str.center(20, '*'))
print(sys.getsizeof(tuple2))

# %%
set1 = {1, 2, 3, 3, 3, 2}
print(set1)
print('Length =', len(set1))
# 创建集合的构造器语法(面向对象部分会进行详细讲解)
set2 = set(range(1, 10))
set3 = set((1, 2, 3, 3, 2, 1))
print(set2, set3)
# 创建集合的推导式语法(推导式也可以用于推导集合)
set4 = {num for num in range(1, 100) if num % 3 == 0 or num % 5 == 0}
print(set4)

set2.update([10, 11])
set2.discard(5)
print(set2)
#
# %%
import os
import time


def main():
    content = '北京欢迎你为你开天辟地…………'
    while True:
        # 清理屏幕上的输出
        os.system('cls')  # os.system('clear')
        print(content)
        # 休眠200毫秒
        time.sleep(0.2)
        content = content[1:] + content[0]


if __name__ == '__main__':
    main()
# %%
def main():
    persons = [True] * 30
    counter, index, number = 0, 0, 0
    while counter < 15:
        if persons[index]:
            number += 1
            if number == 9:
                persons[index] = False
                counter += 1
                number = 0
        index += 1
        index %= 30
    for person in persons:
        print('基' if person else '非', end='')


if __name__ == '__main__':
    main()
# %%
import os


def print_board(board):
    print(board['TL'] + '|' + board['TM'] + '|' + board['TR'])
    print('-+-+-')
    print(board['ML'] + '|' + board['MM'] + '|' + board['MR'])
    print('-+-+-')
    print(board['BL'] + '|' + board['BM'] + '|' + board['BR'])


def main():
    init_board = {
        'TL': ' ', 'TM': ' ', 'TR': ' ',
        'ML': ' ', 'MM': ' ', 'MR': ' ',
        'BL': ' ', 'BM': ' ', 'BR': ' '
    }
    begin = True
    while begin:
        curr_board = init_board.copy()
        begin = False
        turn = 'x'
        counter = 0
        os.system('clear')
        print_board(curr_board)
        while counter < 9:
            move = input('轮到%s走棋, 请输入位置: ' % turn)
            if curr_board[move] == ' ':
                counter += 1
                curr_board[move] = turn
                if turn == 'x':
                    turn = 'o'
                else:
                    turn = 'x'
            os.system('clear')
            print_board(curr_board)
        choice = input('再玩一局?(yes|no)')
        begin = choice == 'yes'


if __name__ == '__main__':
    main()
# %%