[英]How to print all the instances in a class one by one?
如何一一打印一个类的所有实例?
这是代码:
class Person:
def __init__(self, fname, lname, age, gender):
self.fname = fname
self.lname = lname
self.age = age
self.gender = gender
class Children(Person):
def __init__(self, fname, lname, age, gender, friends):
super().__init__(fname, lname, age, gender)
self.friends = friends
a100 = Children("a1", "a10", 17, "male", "a2 , a3 , a4 , a5")
a200 = Children("a2", "a20", 17, "male", "a5, a1, a4, a3 ")
a300 = Children("a3", "a30", 17 , "male", "a2, a1")
a400 = Children("a4", "a40", 17, "female", "a1, a2")
a500 = Children("a5", "a50", 16, "male", "a2, a1")
x = ["a100", "a300", "a500", "a200", "a400"]
for n in x:
print(n.age)
错误是:
Traceback (most recent call last):
File "ex1.py", line 23, in <module>
print(n.age)
AttributeError: 'str' object has no attribute 'age'
正如您的错误消息所暗示的那样,您正在尝试访问字符串对象的age
属性。 这是因为n
是遍历列表x
的循环变量。
此列表包含您会混淆的字符串,因为它们代表您的变量的“名称”。
您想要做的只是更改您的列表以保存实际变量而不是它们的名称作为字符串。 像这样:
x = [a100, a300, a500, a200, a400]
您可以通过 globals() 获取它们 - 返回所有当前全局对象的映射,例如:
print([globals()[s].age for s in x])
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