如何在Python中创建打印方法 我对Python相当陌生，并且有一些C++背景。我刚刚开始考虑面向对象编程，但在我创建的这个类中定义print方法时遇到了一个问题。我已经阅读了repr（）和str（）函数，但它们似乎都不起作用 class chicken(): def __init__(self, name, eatable, species): self.name=name if eatable!="yes" and eatable!="no": self.eatable="no" else: self.eatable=eatable self.species=species #Print the species when called #Doesnt work for some reason def print_species(self): print "%s" %str(self.species) #Print whether or not the bird is eatable #This method also doesnt work def print_eatable(self): print "%s" %str(self.eatable) def change_species(self, new_name): self.species=new_name def change_eatable(self, new_status): self.eatable=new_status if new_status!="yes" and new_status!="no": self.eatable="no" else: self.eatable=new_status peep=chicken("Peep", "yes", "Gallus Domesticus") peep.change_eatable("meatballs") peep.print_eatable peep.print_species #This does work print peep.eatable

有谁能解释一下我如何创建一个方法，这样我就可以简单地打印有关对象的信息（即peep.print_species=“Gallus Domesticus”）

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谢谢

函数调用末尾缺少括号

peep.print_eatable()
peep.print_species()

当您在没有括号的情况下编写peep.print_species时，Python不会报告语法错误，因为它是一个完全合法的语句，返回方法对象

print_species

，您需要调用方法，而不仅仅是获取它们。将

（）

放在语句后面：

peep=chicken("Peep", "yes", "Gallus Domesticus")
peep.change_eatable("meatballs")
peep.print_eatable()

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您需要在函数调用的末尾添加括号：

peep.print_eatable()
peep.print_species()

所以代码应该是：

class chicken():
    def __init__(self, name, eatable, species):
        self.name=name
        if eatable!="yes" and eatable!="no":
            self.eatable="no"
        else:
            self.eatable=eatable
        self.species=species
    #Print the species when called
    #Doesnt work for some reason
    def print_species(self):
        print"%s" %str(self.species)
    #Print whether or not the bird is eatable
    #This method also doesnt work
    def print_eatable(self):
        print "%s" %str(self.eatable)
    def change_species(self, new_name):
        self.species=new_name
    def change_eatable(self, new_status):
        self.eatable=new_status
        if new_status!="yes" and new_status!="no":
            self.eatable="no"
        else:
            self.eatable=new_status
peep=chicken("Peep", "yes", "Gallus Domesticus")
peep.change_eatable("meatballs")
peep.print_eatable()
peep.print_species()
#This does work
print peep.eatable

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函数调用后需要括号，一点也不需要。我们都去过那里！