name = "Katherine"
message = "Hello "+name.title()+", would you like to leatn some Python today?"
print(message)

print(name.upper())
print(name.lower())


myname = " LiLy and Katherine "
myname = myname.lstrip()
print(myname)

a = 3+5
b = 12-4
c = 2*4
d = 20/2.5
print(a,b,c,d)

#使用str()将数字转化为字符串打印
favorite_num = 9
message = "My Favorite Number is "+str(favorite_num)
print(message)