跟着AI学Python 第2课：条件判断

# === 条件判断 ===

# 1. 基本的 if / else
age = 18

if age >= 18:
    print("你已成年，可以考驾照了")
else:
    print("你还未成年，再等等哦")

print()

# 2. 多条件判断：if / elif / else
score = 85

if score >= 90:
    print("优秀！")
elif score >= 80:
    print("良好！")
elif score >= 60:
    print("及格")
else:
    print("不及格，需要补考")

print()

# 3. 比较运算符
a = 10
b = 20

print(f"a == b: {a == b}")   # 等于
print(f"a != b: {a != b}")   # 不等于
print(f"a > b:  {a > b}")    # 大于
print(f"a < b:  {a < b}")    # 小于
print(f"a >= b: {a >= b}")   # 大于等于
print(f"a <= b: {a <= b}")   # 小于等于

print()

# 4. 逻辑运算符：and / or / not
age = 25
has_license = True

if age >= 18 and has_license:
    print("可以开车上路")
else:
    print("还不能开车")

raining = False
has_umbrella = False

if raining and not has_umbrella:
    print("会被淋湿！")
elif not raining:
    print("没下雨，不用带伞")
else:
    print("有伞，不怕")

print()

# 5. 动手试试：猜年龄程序
answer = 30
guess = int(input("猜猜我几岁？（输入数字）："))

if guess == answer:
    print("猜对了！")
elif guess > answer:
    print("猜大了，再想想")
else:
    print("猜小了，再想想")

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