lesson_1 常用运算符

print('test1  \" test1')     # 对引号在需要保持不变进行输出的字符前面进行转义\
print("test2"
      "开始")
print('''test3
test4''')               # 单双三引号都可以，三引号换行时不会多加引号

# 简单的数据类型
a = "大家好，我是派更大星"
b = "     "
c = None     # 它是不存在，在python几乎不用
d = "null"
e = 123
data_folat = 123.123

print(type(c))
print(type(d))

# 运算符 --> 算数运算符 、比较运算符 、 赋值运算符 、 成员运算符 、身份运算符

# 比较运算符
data_1 = 5
data_2 = 10
data_3 = data_1 + data_2
print(data_3)

result = (data_1 ==data_2)
print(result)

result = (data_1 !=data_2)
print(result)

result = (data_1 < data_2)
print(result)

# 赋值运算符
count = 0
count += data_1
print("扫描第一件物品，总价格为",count)
count += data_2
print("扫描第二件物品，总价格为",count)
count += data_3
print("扫描第三件物品，总价格为",count)

print(data_3 / data_1)
print(data_3 // data_1)

basic_data = 10
mi_times = 3
print(basic_data ** mi_times)

# 逻辑运算符
height = 188
age = 30
print(height == 188 and age > 25)
print(height < 188 or age > 25)
print(not(height == 188))