Python 判断语句和循环语句

result = 10 > 5
print(f"result的值是{result}，类型是{type(result)}")

print("欢迎来到黑马儿童游乐场，儿童免费，成人收费。")
age = int(input("请输入你的年龄："))#类型转换

if age >= 18:
    print("您已成年") #有4格缩进
    print("游玩需要补票10元")

print("祝您游玩愉快")

print("欢迎来到黑马儿童游乐场，儿童免费，成人收费。")
age = int(input("请输入你的年龄："))#类型转换

if age >= 18:
    print("您已成年，游玩需要补票10元。")
else:#同样有冒号，且其中的语句有4个格缩进
    print("您未成年,可以免费游玩")

print("欢迎来到黑马动物园")
if int(input("请输入你的身高（cm）:")) < 120:
    print("您的身高小于120cm，可以免费游玩")
elif int(input("请输入vip等级:")) > 3:
    print("您的vip等级大于3，可以免费游玩")
elif int(input("请告诉我今天几号:")) == 1:
    print("今天是1号免费日,可以免费游玩")
else:
    print("不好意思,您不满足免费游玩的条件,需购票")

print("欢迎来到黑马动物园")
if int(input("请输入你的身高（cm）:")) > 120:
    print("您的身高大于120cm，不能免费游玩")
    print("不过,若您的vip等级超过3,可以免费游玩")
    if int(input("请输入vip等级:")) > 3:
        print("您的vip等级大于3，可以免费游玩")
    else:
        print("不好意思,您不满足免费游玩的条件,需购票")
else:
    print("您的身高小于120cm,可以免费游玩")

import random
count = 0
num = random.randint(1,100)#生成1~100的随机整数，包括1和100

while True:
    guess = int(input("请输入猜测的数字："))
    count += 1	#python中没有count++这种累加操作
    if guess == num:
        print("猜中了")
        break
    else:
        if guess < num:
            print("小了")
        else:
            print("大了")

print("共猜了%d次" % count)

i = 1
while i <= 100:
    print(f"第{i}天表白")

    j = 1
    while j <= 10:
        print(f"第{i}天，送的第{j}朵玫瑰花")
        j += 1

    print("小美，我喜欢你")
    i += 1

i = 1
while i < 10:

    j = 1
    while j <= i:
        print(f"{j} * {i} = {j * i}\t", end = '')
        j += 1

    i += 1
    print()

info = "hello"
for ch in info:
    print(ch)

name = "itheima is a brand of itcast"
count = 0
for ch in name:
    if ch == 'a':
        count += 1
print(f"共有{count}个a")	# 共有4个a

for i in range(5):
    print(i)

count = 0
for i in range(1, 100):
    if i % 2 == 0:
        count += 1

print(f"共有{count}个偶数")	# 共有49个偶数

for i in range(5):
	print(i)
print(i)	# 能否访问到变量i？

i = 0
for i in range(5):
    print(i)
print(i)

for i in range(1, 101):
    print(f"今天是向小美表白的第{i}天")

    for j in range(1, 11):
        print(f"送小美第{j}朵玫瑰花")

    print("小美，我喜欢你")

for i in range(1, 10):
    for j in range(1, 10):
        if j <= i:
            print(f"{j} * {i} = {j * i}\t", end = '')
    print()

import random
money = 10000
for i in range(1, 21):
    if money < 1000:
        print("工资发完了，下个月领取吧")
        break
    score = random.randint(1, 10) #生成1~10的随机整数，包括1和10
    if score < 5:
        print(f"员工{i},绩效分{score},低于5,不发工资,下一位")
    else:
        money -= 1000;
        print(f"向员工{i}发放工资1000元，账户余额还剩余{money}元")

# 函数定义
def say_hello():
    print("hello world")
# 函数调用
say_hello()	#输出 hello world

# 函数定义
def add(x, y):
    print(f"{x} + {y} = {x + y}")
# 函数调用
add(3, 4)

# 函数定义
def add(x, y):
    return x + y
# 函数调用
res = add(3, 4)
print(res)	#输出7

def say_he11o():
    print("Hello...")

result = say_he11o()
print(result)
print(type(result))

def say_he11o():
    print("Hello...")
    return None

result = say_he11o()
print(result)
print(type(result))

def check_age(age):
    if age >= 18:
        return "success"
    else:
        return None

result = check_age(16)
if not result:
    print("未满18岁，不能进网吧")

#暂不赋予变量具体值
name = None

def func_b():
    print("---2---")

def func_a():
    print("---1---")
    func_b()
    print("---3---")

func_a()  # 调用函数func_a

def testA():
    num = 100
    print(num)
testA() # 100
print(num)#报错：name'num'is not defined

#定义全局变量num
num = 100
def testA():
    print(num)
def testB():
    print(num)
    
testA() #100
testB() #100

num = 200
def test_a():
    print(f"test_a: {num}")

def test_b():
    num = 500
    print(f"test_b:{num}")
    
test_a()
test_b()
print(num)

num = 200
def test_a():
    print(f"test_a: {num}")

def test_b():
    global num #增加了global
    num = 500
    print(f"test_b:{num}")

test_a()
test_b()
print(num)

money = 5000000
name = input("请输入姓名：") 
# 菜单
def menu(): 
    print(f"{name},您好，欢迎来到黑马银行ATM，请选择操作：")
    print("查询余额\t【输入1】")
    print("存款\t\t【输入2】")
    print("取款\t\t【输入3]")
    print("退出\t\t【输入4】")
    return input("请输入您的选择：")
# 查询余额
def query(show_header): 
    # 控制是否输出表头
    if show_header:
        print("-------------查询余额--------------")
    print(f"{name}，您好，您的余额剩余：{money}元")
# 取款
def save(deposit): 
    print("-------------存款--------------")
    global money
    money += deposit
    print(f"{name}，您好，您存款{deposit}元成功")
    query(False)
# 存款
def get(withdraw): 
    print("-------------取款--------------")
    global money
    money -= withdraw
    print(f"{name}，您好，您取款{withdraw}元成功")
    query(False)
 
while True:
    choice = menu() # 用户选择
    if choice == "1":
        query(True)
    elif choice == "2":
        save(int(input("请输入要存入的金额：")))
    elif choice == "3":
        get(int(input("请输入要去除的金额：")))
    else:
        break
print("程序退出...")