[Python learning] - Python basic grammar (3)

1. Boolean type and comparison operators

Making logical judgments is a common behavior in life. Similarly, making logical judgments is also the most basic function in programs.

Review the six data types of Python

Defining comparison operators for Boolean types

# 定义变量存储布尔类型的数据
bool_1 = True
bool_2 = False
print(f"bool_1变量的内容是：{bool_1},类型是：{type(bool_1)}")
print(f"bool_2变量的内容是：{bool_2},类型是：{type(bool_2)}")

# 进行内容的相等比较
num1 = 10
num2 = 10
print(f"10 == 10的结果是：{num1 == num2}")

num1 = 15
num2 = 10
print(f"10 != 15的结果是：{num1 != num2}")

name1 = "caicai"
name2 = "caiyy"
print(f"caicai == caiyy的结果是:{name1 == name2}")

# 演示大于小于，大于等于，小于等于的比较
num1 = 10
num2 = 12
print(f"10 > 12的结果是：{num1 > num2}")
print(f"10 < 12的结果是：{num1 < num2}")

num1 = 10
num2 = 20
print(f"10 >= 20的结果是：{num1 >= num2}")
print(f"10 <= 20的结果是：{num1 <= num2}")

Second, the basic format of the if statement

age = 10
if age >= 18:
    print("我已经成年啦")
    print("即将步入大学生活")

print("时间过得真快啊")

# if 语句的基本格式

age = 30
if age >= 18:
    print("我已经成年啦")
    print("即将步入大学生活")

print("时间过得真快啊")

Summarize:

practice questions

# 获取键盘输入
age = int(input("请输入您的年龄："))
# 通过if判断是否成年
if age >= 18:
    print("我已经成年啦，游玩需要买票，10元")
print("祝您游玩愉快")

3. The if else statement

#  if else语句的使用
print("欢迎来到王者荣耀")

age=int(input("请输入您的年龄："))
if age >= 18:
    print("您已成年啦")
else:
    print("您未成年")
print("祝您游玩愉快")

#  if else语句的使用
print("欢迎来到动物园")

height = int(input("请输入您的身高："))
if height > 120:
    print("您的身高超出120cm,游玩需要10元")
else:
    print("您的身高未超出120cm,可以免费游玩")
print("祝您游玩愉快")

4、if alphabet else

Judge mutual exclusion

#  if elif else语句的使用
print("欢迎来到动物园")

height = int(input("请输入您的身高："))
vip_level = int(input("请输入您的VIP级别（1-5）："))
if height < 120:
    print("您的身高小于120cm,免费游玩")
elif vip_level > 3:
    print("vip级别大于3，可以免 费游玩")
else:
    print("不好意思，条件都不满足，需要买票10元")
print("祝您游玩愉快")

5. Nesting of judgment statements

6. Comprehensive case of judgment statement