#numbers 整数，小数
#string
a = 5
b = 10
print(10 + 5)
print(a + b)

name = "wrf"
print(name)
#与数组类似
print(name[0])
#len求字符串的长度
print(len(name))
print(name[len(name) - 1])
#打印中间的几个字符串
print(name[0:2])
#打印几次
print(name * 2)