为什么这个执行不出来呢
def cheese_and_crackers(cheese_count,boxes_of_crackers):print("You have %r cheeses!")%cheese_count
print("You have %r 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)
代码执行错误是因为你的字符串格式化操作（%操作符）在打印语句外部进行。你应该将%操作符以及后续的变量放在括号内，这样就可以将字符串中的%r替换为变量的值。正确的代码应该如下：
def cheese_and_crackers(cheese_count, boxes_of_crackers):
print("You have %r cheeses!" % cheese_count)
print("You have %r 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)
另外，注意到在你的代码中，"We can just give the function numbers directly:"这句话应该在函数调用前打印，而不是在函数内部打印。如下所示：
def cheese_and_crackers(cheese_count, boxes_of_crackers):
print("You have %r cheeses!" % cheese_count)
print("You have %r 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)
以上修改过后的代码应该可以正常运行了。
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