1、数字之运算
（1）整数int
# 数字类型：整数int
a=1
b=2
print(a + b)
print(a - b)
print(a * b)
print(a / b)
（2）小数float
# 数字类型：小数float
a = 1.0
b = 0.1
print(a + b)
print(a - b)
print(a * b)
print(a / b)
2、字符串
# 数据类型：字符串str
a = 'Hello!'
b = "My"
c = """name is
LiLy."""
d = '''Who are you?'''
x = ' ' #空格
print(a + b + x + c) #加法+表示字符串拼接
print("Hello world!")
print(d * 3) #乘法*表示重复次数
3、布尔
# 布尔类型：true/false
a = 10
b = 20
c = a + b
print(c)
print(a > b)
print(a < b)
print(a < c)
