第二周练习 part2 --- 字符串的所有操作、字典的多级查找、eval

#字符串的所有操作

name = 'Lief \tis a {type} student.'
print(name.center(39,'-'))  # 将字符串放置在另一个重复字符串的中间
print(name.endswith("f"))  # 判断是否以某个指定字符串结尾
print(name.expandtabs(tabsize = 9))  # 在\t处加空格
print(name[name.find('student'):])  #
print(name[name.find('student')])
print(name.format(type='college'))  # 填入内容
print('+'.join(['q','w','e','r']))  # 在字符间加入单个字符
print(name.rjust(30,'L'))   # 在字符串左边加上若个单个字符
print(name.ljust(30,'f'))  # 在字符串右边加上若个单个字符
print(name.lower())  # 变成小写
print(name.upper())  # 变成大写
print('   \nLief'.lstrip())  # 去掉空格、换行
print('Lief\n'.rstrip())
print('\nLief\n'.strip())
# 造密码！！！！！
Transfer = str.maketrans('qwertyuiopasdfghjklzxcvbnm','12345678901234567890123456')
print('hzwwddl'.translate(Transfer))

print(name.replace('e', 'Q',))  # 替换字符串中的某个字符

print(name.rfind('s'))  # 找到最靠右的那个字符的下标

print(name.partition('st')) # 在出现指定字符的地方将整串字符拆分
print(name.split('st'))    # 在出现指定字符的地方将整串字符拆分，并删除指定字符,输出的是列表,如下

a = name.split('st')
print(a[1])

print('my name\nis lee'.splitlines())  # 按换行将字符串拆分成列表里的元素

print(name.swapcase())  # 转换大小写

 

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# 字典的多级查找

catalog = {
            'TJU': {'A': {'re'}, 'D': {'wr'}, 'R': {'we'}},
            'NKU': {'W': {'a': {'we'}, 's': {'re'}, 'd': {'wy'}}},
            'PKU': {'U': {'wddd'}, 'P': {'wgg'}},
            'TZU': {'I': {'wefse'}, 'X': {'fhusde'}}
}
exit_flag = False
while not exit_flag:
    for i in catalog:
        print(i)          # 打印第一层
    choice = input('Input your choice you want in，input q to quit: ')     # 输入选择
    if choice in catalog:
        while not exit_flag:
            for i2 in catalog[choice]:    # 在里面就打印第二层
                print('\t', i2)
            choice2 = input('Input your choice2 you want in，input q to quit: ')     # 输入选择
            if choice2 in catalog[choice]:
                while not exit_flag:
                    for i3 in catalog[choice][choice2]:    # 在里面就打印第三层
                        print('\t\t',i3)
                    choice3 = input('Input your choice3 you want in，input q to quit: ')     # 输入选择
                    if choice3 in catalog[choice][choice2]:
                        while not exit_flag:
                            for i4 in catalog[choice][choice2][choice3]:
                                print('\t\t\t', i4)
                                print('You have reached the bottom.')
                                exit_flag = True
                    elif choice3 == 'q':
                        exit_flag = True
                    elif choice3 == 'b':
                        break
                    else:
                        print('Does not exist or you have reached the bottom.')
            elif choice2 == 'q':
                exit_flag = True
            elif choice2 == 'b':
                break
            else:
                print('Does not exist or you have reached the bottom.')
    elif choice == 'q':
        exit_flag = True
    elif choice == 'b':
        break
    else:
        print('Does not exist or you have reached the bottom.')

 

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# eval 能将字符串转成字典

dic = eval(
"""{
    'TJU': {'A': [34, 21], 'D': [21,22], 'R': [39,321]},
    'NKU': {'W': {1: [29,12], 2: [34,22], 3: [23,66]}},
    'PKU': {'U': [67,32], 'P': [33,88]},
    'TZU': {'I': [88,54], 'X': [55,437]}
}""")

print(dic['TJU'])