06 python下

 # 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)