# st='hello kitty {name} is {age}'

 #

 # print(st.count('l'))       #  统计元素个数

 # print(st.capitalize())     #  首字母大写

 # print(st.center(50,'#'))   #  居中

 # print(st.endswith('tty3')) #  判断是否以某个内容结尾

 # print(st.startswith('he')) #  判断是否以某个内容开头

 # print(st.expandtabs(tabsize=20))

 # print(st.find('t'))        #  查找到第一个元素，并将索引值返回

 # print(st.format(name='alex',age=37))  # 格式化输出的另一种方式   待定：?:{}

 # print(st.format_map({'name':'alex','age':22}))

 # print(st.index('t'))

 # print('asd'.isalnum())

 # print('12632178'.isdecimal())

 # print('1269999.uuuu'.isnumeric())

 # print('abc'.isidentifier())

 # print('Abc'.islower())

 # print('ABC'.isupper())

 # print('  e'.isspace())

 # print('My title'.istitle())

 # print('My tLtle'.lower())

 # print('My tLtle'.upper())

 # print('My tLtle'.swapcase())

 # print('My tLtle'.ljust(50,'*'))

 # print('My tLtle'.rjust(50,'*'))

 # print('\tMy tLtle\n'.strip())

 # print('\tMy tLtle\n'.lstrip())

 # print('\tMy tLtle\n'.rstrip())

 # print('ok')

 # print('My title title'.replace('itle','lesson',1))

 # print('My title title'.rfind('t'))

 # print('My title title'.split('i',1))

 # print('My title title'.title())

 #摘一些重要的字符串方法

 #1 print(st.count('l'))

 # print(st.center(50,'#'))   #  居中

 # print(st.startswith('he')) #  判断是否以某个内容开头

 # print(st.find('t'))

 # print(st.format(name='alex',age=37))  # 格式化输出的另一种方式   待定：?:{}

 # print('My tLtle'.lower())

 # print('My tLtle'.upper())

 # print('\tMy tLtle\n'.strip())

 # print('My title title'.replace('itle','lesson',1))

 # print('My title title'.split('i',1))

 # a=list()

 # print(a)

 # dic={'name':'alex'}

 # dic1={}

 # dic2=dict((('name','alex'),))

 # print(dic2)

 # dic3=dict([['name','alex'],])

 # print(dic3)

 # ret2=dic1.setdefault('hobby','girl')

 # print(dic1)

 # print(ret2)

 # dic3={'age': 18, 'name': 'alex', 'hobby': 'girl'}

 #

 # print(dic3['name'])

 #

 # print(list(dic3.keys()))

 # print(list(dic3.values()))

 # print(list(dic3.items()))

 # li=[1,2,34,4]

 # li[2]=5

 # dic3={'age': 18, 'name': 'alex', 'hobby': 'girl'}

 # dic3['age']=55

 # print(dic3)

 # dic4={'age': 18, 'name': 'alex', 'hobby': 'girl'}

 # # dic5={'1':'111','2':'222'}

 # dic5={'1':'111','name':'222'}

 #

 # dic4.update(dic5)

 # print(dic4)

 # print(dic5)

 # dic1={'name':'alex'}

 # dic1['age']=18

 # print(dic1)

 # dic5 = {'name': 'alex', 'age': 18, 'class': 1}

 # dic5.clear() # 清空字典

 # print(dic5)

 # del dic5['name'] #删除字典中指定键值对

 # print(dic5)

 # print(dic5.pop('age')) #删除字典中指定键值对，并返回该键值对的值

 # ret=dic5.pop('age')

 # print(ret)

 # print(dic5)

 # a = dic5.popitem() #随机删除某组键值对，并以元组方式返回值

 # print(a, dic5)

 # del dic5        #删除整个字典

 # print(dic5)