# 26.函数和参数
# 注意：有参函数和无参函数的名字要不同

def user():  # 无参函数print("hello world!")def user1(my_id):  # 有参函数print(my_id)def user2(first_name, last_name):  # 有参函数print(f'My name is {first_name} {last_name}')print("start...")
user()  # 调用无参函数
user1("123456")
user2("John", "Smith")
print("end...")
'''
start...
hello world!
123456
My name is John Smith
end...
'''

# 27.关键字参数
# 更适合使用数值计算的函数，可使用关键字参数来提高可读性。

user2(last_name="liming", first_name="qiuxie")
'''
My name is qiuxie liming
'''def cal(one, two, three):print(one * (two + three))cal(one=12, two=10, three=30)  # 480

# 28.返回函数
# 指明函数返回的值,需要print输出返回值。

def power(number):  # 一种计算方式number^numberreturn number ** numberprint(power(4))  # 4^4 = 256

# 29.创建可重用函数
# 构建一些常用函数，在需要引用时直接调用，避免重复代码。

def emoji_converter(message):words = message.split()emoji = {"happy": '=^_^=',"sad": '＞﹏＜',"like": '(❤ ω ❤)'}output = ""for word in words:output += emoji.get(word, word) + " "return outputmessage = input("> ")
print(emoji_converter(message))'''
> I am happy ,but my dag is sad ,because it lose that it like foods.
I am =^_^= ,but my dag is ＞﹏＜ ,because it lose that it (❤ ω ❤) foods. 
'''

# 30.例外(一种错误处理方式)
# 可用于提示用户输入错误的原因

# 需要测试的代码
try:age = int(input("> "))income = 10000EXP = age - 18risk = (income * age) / EXPprint(age)# 可能的错误类型，及对应错误类型的处理方式。
except ZeroDivisionError:print("EXP cannot be 0")
except ValueError:print("Invalid value")'''
> 0
0
> w
Invalid value
'''