如何解决为什么什么都没打印出来?
我是python的新手,所以我认为这可能是个简单的问题,但这使我感到困惑。这是我的代码:
# Mike Fitzgibbon CS4250 Project4 implement class diagram
# define the class
class Product:
# name is the name of the product
name = None
# price is how much the product costs
price = None
# discount percent is how much the discount is in percentages
discountPercent = None
# define the constructor
def __init__(self,n,p,d):
# initialize variables
self.name = n
self.price = p
self.discountPercent = d
# define get discount by returning the discount
def getdiscountAmount(self):
return self.discountPercent
# define discount price by returning the discount percent times the price
def getdiscountPrice(self):
return self.discountPercent*self.price
# define get description by creating description using field variables
def getDescription(self):
print("Name: "+self.name)
print("Price: "+self.price)
print("discount: "+self.discountPercent+"%")
print("discount price: "+self.getdiscountPrice())
def __main__():
p=Product("A",100,90.0)
print(p.getDescription())
当我运行此代码时,什么都不会打印出来。为什么?我该如何解决?
解决方法
您需要添加;
if name == '__main__':
main()
这样做的原因是您定义了main函数,但没有告诉计算机运行它。
,要运行__main__()
函数,可以将其添加到程序的末尾:
if __name__ == "__main__":
__main__()
要打印值,请将print(p.getDescription())
更改为p.getDescription()
,因为在类中调用该函数将输出这些值。顺便说一句,您不能将int / float与str并置,因此您应该将int / float转换为字符串,例如print("Price: "+str(self.price))
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