笨办法学Python3 习题18和19

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本文通过习题形式，深入解析了Python中函数定义与调用的多种方式，包括使用不同数量和类型的参数，以及如何在函数中进行数学运算和变量组合。通过具体的代码示例，读者可以更好地理解Python函数的工作原理。

基于Python3.6

习题18

def print_two(*args):
    arg1, arg2 = args
    print("arg1: %r, arg2: %r" %(arg1, arg2))


def print_two_again(arg1, arg2):
    print("arg1: %r, arg2: %r" % (arg1, arg2))


def print_one(arg1):
    print("arg1: %r"% arg1)


def print_none():
    print("I got nothin'.")


print_two("Zed", "Shaw")
print_two_again("Zed", "Shaw")
print_one("First!")
print_none()

习题19

def cheese_and_crackers(cheese_count, boxes_of_crackers):
    print("You have %d cheeses!" % cheese_count)
    print("You have %d boxes of crackers!" % boxes_of_crackers)
    print("Man that's enough for a party!")
    print("Get a blanket.\n")


print("We can just give the function numbers directly:")
cheese_and_crackers(20, 30)


print("Or, we can use variables from our scripts:")
amount_of_cheese = 10
amount_of_crackers = 50

cheese_and_crackers(amount_of_cheese, amount_of_crackers)


print("We can even do math inside too:")
cheese_and_crackers(10 + 20, 5 + 6)


print("And we can combine the two, variables and math:")
cheese_and_crackers(amount_of_cheese + 100, amount_of_crackers + 1000)