python
# str1="xiaozhzhang"# print(str1.startswith("x")) True
# print(str1.startswith("xiao")) True
# print(str1.startswith("g")) False
# print(str1.startswith("ix")) False
# str1="xiaozhang"
# print(str1.endswith("g")) True
# print(str1.endswith("gna"))False
# print(str1.endswith("ang")) true
# file_name=input("请输入你的文件名称及后缀:")
# if file_name.endswith(".txt"):
# print("请输入的文件有效")
# else:
# print("你输入的文件无效")
# str1="duoceshi"
# print(str1.find("c"))3
# print(str1.find("i"))7
# str1 = "xiaozhang"
# print(str1.find("a")) # 2
# print(str1.find("a",3,8))#6
# print(str1.rfind("a")) # 6
# str1="duoceshi"
# print(str1.replace("o","x"))#duxceshi
# str1="duocesohi"
# print(str1.replace("o","x"))#duxcesxhi
# print(str1.replace("o","x",1))#duxcesohi
# str1="XiAOzHANG"
# print(str1.lower()) #xiaozhang
# print(str1.upper())#XIAOZHANG
# str1="1234567"
# print(str1.isdigit())#True
# str1="abcdef"
# print(str1.isalpha()) # True
# str1="abcdeg123456"
# print(str1.isalnum()) # True
# str1="Xiaozhang"
# print(str1.istitle()) #True
# str1="xiaozhang"
# print(str1.isupper()) #False
# print(str1.islower()) #True
# list1 = ["duoceshi","xian",10086,["10010","xiaozhang"]]
# print(list1)["duoceshi","xian",10086,["10010","xiaozhang"]
# print(type(list1))<class 'list'>
# str1="xian03"
# list1=list(str1)
# print(list1) ['x', 'i', 'a', 'n', '0', '3']
# print(type(list1)) <class 'list'>
# list1 = ["duoceshi","xian",10086,["10010","xiaozhang"]]
# list1="xiaoshuai"
# print(list1) ['xiaoshuai', 'xian', 10086, ['10010', 'xiaozhang']]
# list1 = ["duoceshi","xian",10086,["10010","xiaozhang"]]
# list1 ="hello"
# print(list1) ['duoceshi', 'h', 'e', 'l', 'l', 'o', ['10010', 'xiaozhang']]
# list1 = ["xiaozhang","dcs","xian03",10010]
# list1.append("10086")
# print(list1)['xiaozhang', 'dcs', 'xian03', 10010, '10086']
# list1.append(6000)
# print(list1) ['xiaozhang', 'dcs', 'xian03', 10010, 6000]
# list1.append(["中国"])
# print(list1) ['xiaozhang', 'dcs', 'xian03', 10010, ['中国']]
# list1=["xiaozhang","dce","xian03",10010]
# list1.insert(2,"xiaoshuai")
# print(list1) ['xiaozhang', 'dce', 'xiaoshuai', 'xian03', 10010]
# list1.insert(2,6000)
# print(list1) ['xiaozhang', 'dce', 6000, 'xian03', 10010]
# list1.insert(2,["china"])
# print(list1) ['xiaozhang', 'dce', ['china'], 'xian03', 10010]
# list1=["name","age","xiaozhang"]
# list2=["hello","dcs","18"]
# list1.extend(list2)
# print(list1)#['name', 'age', 'xiaozhang', 'hello', 'dcs', '18']
# list1=["name","age","xiaozhang"]
# str1="dcs"
# list1.extend(str1)
# print(list1)#['name', 'age', 'xiaozhang', 'd', 'c', 's']
# list1=["name","age","xiaozhang"]
# int1=123456
# list1.extend(int1)
# print(list1)TypeError: 'int' object is not iterable
# list1=["xiaozhang","dcs","xian03","10010"]
# print(list1.index("xiaozhang")) #0
# print(list1.index("xian03"))2
# list1=["xiaozhang","dcs","xian03",10010]
# list1.remove("dcs")
# print(list1)['xiaozhang', 'xian03', 10010]
# list1=["xiaozhang","dcs","xian03",10010,10010]
# list1.remove(10010)
# list1.remove(10010)
# print(list1) ['xiaozhang', 'dcs', 'xian03']
# list1=["xiaozhang","dcs","xian03",10010,10010]
# del list1
# print(list1)['xiaozhang', 'dcs', 'xian03', 10010]
# list1=["xiaozhang","dcs","xian03",10010,]
# print(list1.pop())10010
# print(list1['xiaozhang', 'dcs', 'xian03']
# print(list1.pop(2))xian03
# print(list1)['xiaozhang', 'dcs', 10010]
# list1=["xiaozhang","dcs","xian03",10010]
# print(list1[::-1])
# list1.reverse()
# print(list1)
# list1 = ["xiaozhang","dcs","xian03","10010"]
# list1.sort()
# print(list1) #['10010', 'dcs', 'xian03', 'xiaozhang']
# list1 = ["xiaozhang","dcs","Xian03","10010"]
# list1.sort()
# print(list1) #['10010', 'Xian03', 'dcs', 'xiaozhang']
# list1.sort(reverse=True)
# print(list1)#['xiaozhang', 'dcs', 'Xian03', '10010']
# list1=
# list2=sorted(list1)
# print(list2)#
# print(list1)#
# list3=sorted(list1,reverse=True)
# print(list3)#
# tuple1=("dcs","xiaozhang",12,["hello","china"])
# print(tuple1) ('dcs', 'xiaozhang', 12, ['hello', 'china'])
# list1=["dcs","xiaozhang",12,["hello","china"]]
# tuple1=tuple(list1)
# print(tuple1) ('dcs', 'xiaozhang', 12, ['hello', 'china'])
# tuple1=("xiaozhang",)
# print(tuple1) ('xiaozhang',)
# print(type(tuple1)) <class 'tuple'>
# tuple1=("dcs","xiaozhang",12,["hello","china"])
# print(tuple1)xiaozhang
# tuple="xian03"
# tuple1.insert(0,"xian03")
# del tuple1
# print(tuple1)
# tuple1=("dcs","xiaozhang",12,["hello","china"])
# list1=list(tuple1)
# print(list1)#['dcs', 'xiaozhang', 12, ['hello', 'china']]
# list1="xian03"
# print(list1) #['xian03', 'xiaozhang', 12, ['hello', 'china']]
# tuple2=tuple(list1)
# print(tuple2) #('xian03', 'xiaozhang', 12, ['hello', 'china'])
# tuple1=("dcs","xiaozhang",12,["hello","china"])
# tuple1="chinese"
# print(tuple1)#('dcs', 'xiaozhang', 12, ['hello', 'chinese'])
# tuple1=("dcs","xiaozhang",12,["hello","china"])
# for i in tuple1:
# print(i) # dcs xiaozhang 12 ['hello', 'china']
# dict1={"name":"xiaozhang","age":"18"}
# print(dict1) {'name': 'xiaozhang', 'age': '18'}
# print(type(dict1))
# list1=[["name","xiaozhang"],["age","18"]]
# dict1=dict(list1)
# print(dict1)
# print(type(dict1))<class 'dict'>
# dict1={"name":"xiaozhang","age":"18"}
# dict1["sex"]="man"
# print(dict1) {'name': 'xiaozhang', 'age': '18', 'sex': 'man'}
# dict1={"name":"xiaozhang","age":"18"}
# for i in dict1.keys():
# print(i)nameage
# for i in dict1:
# print(i)nameage
# dict1={"name":"xiaozhang","age":"18"}
# for i in dict1.values():
# print(i) #xiaozhang18
# dict1={"name":"xiaozhang","age":"18"}
# print(dict1["name"]) #xiaozhang
# print(dict1["age"]) 18
# dict1={"name":"xiaozhang","age":"18"}
# dict1.setdefault("sex","men")
# print(dict1)#{'name': 'xiaozhang', 'age': '18', 'sex': 'men'}
# dict1.setdefault("age","19")
# print(dict1)#{'name': 'xiaozhang', 'age': '18'}
# dict1.setdefault("class")
# print(dict1)#{'name': 'xiaozhang', 'age': '18', 'class': None}
# dict1={"name":"xiaozhang","age":"18"}
# del dict1
# print(dict1) #NameError: name 'dict1' is not defined
# dict1={"name":"xiaozhang","age":"18"}
# del dict1["name"]
# print(dict1)#{'age': '18'}
# dict1={"name":"xiaozhang","age":"18"}
# for i in dict1:
# print(i,dict1) #name xiaozhangage 18
# for k,v in dict1.items():
# print(k,v) #name xiaozhang age 18
# dict1={"name":"xiaozhang","age":"18"}
# print(dict1.pop("name"))#xiaozhang
# print(dict1)#{'age': '18'}
# dict1={"name":"xiaozhang","age":"18"}
# dict1.clear()
# print(dict1){}
# dict1={"name":"xiaozhang","age":"18"}
# value=dict1.get("name")
# print(value)#xiaozhang
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