python学习-caculator

# 运算符操作
# 算术运算符
num_a = 100
num_b = 5000

# 加法
print(num_a + num_b)
# 减法
print(num_a - num_b)
# 乘法 *
print(num_a * num_b)
# 除法 /
print(num_a / num_b)
# 取余数 %
print(num_a % num_b)

# 比较运算 结果：布尔值。True,False
# 比较相等 ==
print(num_a == num_b)
# 不相等
print(num_a != num_b)
# 大于等于
print(num_a > num_b) # False
print(num_a >= num_b)
# 小于等于
print(num_a < num_b)
print(num_a <= num_b) # True

# 赋值运算符。=
# += -= 在变量原来的基础，累加或者累减。
meat = 53
xia = 40
water = 2

count = 0 #总价是0
#count = count + meat #牛肉 #0 + 53
count += meat

#count = count + xia #虾 53 + 40
count += xia

#count = count + water #水 53+40+2
count += water
print(count)

count -= xia
print(count)

# 逻辑运算符 and与 or或 not 非
# 条件(True/False) and 条件(True/False) 条件(True/False) or 条件(True/False) not 条件(True/False)
# input函数 输入函数。
city = input("请输入你所在的城市：") #字符串
sex = input("请输入你的性别：") #字符串

# print(city == "上海" and sex == "女") #同时都为真，才会真。
# print(city == "上海" or sex == "女") #同时都为假，才会假。
print(not sex == "女") # not 真 =假 not 假 =真