0413作业
# a = 3# b = 9
# print(a+b)=12
# print(a-b)=-6
# print(a*b)=27
# print(a/b)=0.3333333333333333
# print(a%b)=3
# print(a**b)=19683
# print(a//b)=0
# a=a+b
# print(a)=12
# a-=b
# print(a)=3
# a*=b
# print(a)=108
# a/=b
# print(a)=1.3333333333333333
# a//b
# print(a)=12
# a %b
# print(a)=12
# a = 3
# b = 9
# c = 3
# print(a>b)=False
# print(a==c)=ture
# print(a>=c)=ture
# print(a<=c)=ture
# print(a!=c)=False
# print(a<b and a<=c)=ture
# print(a<=c or a>b)=ture
# print(not a<c)=ture
# print(not a==c)=False
# list1=["liuzhuyu",438,"niuniangniang","dashuaige"]
# print("438" not in list1)=ture
# print(438 not in list1)=False
# print("liuzhuyu" not in list1)=False
# if "liuzhuyu" in list1:
# print("成功")
# else:
# print("失败")
# a=9#00001001
# b=7#00000111
# 128 64 32 16 8 4 2 1
# 0 0000 0 0 0
# print(a&b)=1
# print(a|b)=15
# print(a^b)=14
# print(~a)=-10
# print(a<<2)=36
# print(a>>2)=2
# str1="liuzhuyu"
# print(str1)=u
# print(str1)=u
# print(str1[-2])=y
# print(str1[-8])=l
# print(str1)=iuzhu
# print(str1[:7])=liuzhuy
# print(str1)=liuzhuyu
# print(str1)=lzy
# print(str1[-4:1:-1])=hzu
# print(str1[-6:-3])=uzh
# str1="liuzhuyu"
# print(str1.capitalize())=Liuzhuyu
# print(str1.title())=Liu Zhu Yu
# print(str1.count("u"))=3
# print('*'.join(str1))=l*i*u* *z*h*u* *y*u
# print(str1.split("u"))=['li', ' zh', ' y', '']
# print(str1.split(" "))=['liu', 'zhu', 'yu']
# print(str1.strip("liu"))=zhuy
# print(str1.strip("l"))=iuzhuyu
# print(str1.strip("u"))=liuzhuy
# print(str1.lstrip("li"))=uzhuyu
# print(str1.rstrip('yu'))=liuzh
# str1="liuzhuyu"
# print(str1.endswith("yu"))=true
# print(str1.endswith("y"))=False
# str2=input("请输入您上传的文件：")
# if str2.endswith(".doc"):
# print("您输入的文件有效")
# else:
# print("您输入的文件无效")
# str1="wangdajie"
# print(str1.find("g"))=3
# print(str1.find("a"))=1
# print(str1.rfind("e"))=8
# print(str1.rfind("a"))=5
# print(str1.replace("w","l"))=langdajie
# print(str1.replace("da","xiao"))=wangxiaojie
# print(str1.replace("a","b",2))=wbngdbjie
# str1="WIJojkousoKN"
# print(str1.lower())=wijojkousokn
# print(str1.upper())=WIJOJKOUSOKN
# str1="asd123"
# print(str1.isdigit())=False
# print(str1.isalpha())=False
# print(str1.isalnum())=True
str1="123kjhkjkl*&^%%"
# print(str1.isalnum())=False
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