[英]How am I able to fix an attribute error when using classes
編寫一個名為“Person”的 class,其中包含人名、地址和電話號碼的數據屬性。
class Person:
def __init__(self, n, a, p):
self.name = n
self.address = a
self.phone = p
def set_name(self, n):
self.name = n
def set_address(self, a):
self.address = a
def set_phone(self, p):
self.phone = p
def get_name(self):
return 'Customer Name:'
def get_address(self):
return 'Customer Address:'
def get_phone(self):
return 'Customer Phone Number:'
def main():
n = input('Enter Customer Name: ')
a = input('Enter the Customer Address: ')
p = input('Enter the Customer Phone Number: ')
print(n.get_person())
print(a.get_address())
print(p.get_phone())
main()
如何修復我的屬性錯誤?
首先,您的錯誤確實應該是TypeError
,因為您正在從 class 調用實例方法:
>>> class Foo:
... def __init__(self):
... self.bar = 1
... def thing(self):
... return self.bar
...
>>>
>>>
>>> Foo.thing()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: thing() missing 1 required positional argument: 'self'
但是,無論如何修復都是相同的。
您需要創建一個 class 的實例來訪問其屬性:
class Foo:
def __init__(self):
self.bar = 1
# Foo is a class, but it doesn't have a
# bar attribute. An *instance* of the class
# does
# this raises an attributeError
Foo.bar
AttributeError
# this doesn't, because we created an instance
foo = Foo()
foo.bar
1
您需要創建一個 person 實例,然后您可以獲取它的屬性:
class Person:
def __init__(self, name, address, phone):
self.name = name
self.address = address
self.phone = phone
Person.phone
# AttributeError
# Create an instance of Person here
tim = Person(name='Tim', address='1234 Main St', phone='555-5555')
# Then you can get Tim's information
tim.phone
'555-5555'
您需要使用person = Person(n, a, p)
之類的東西創建 Person class 的實例。 在main()
function 的輸入語句之后執行此操作。
其次,在打印出屬性時,您需要引用您創建的 Person class 的實例(即 person.get_person()、person.get_address() 等)。
最后,在調用 get function 時,請確保這些函數返回您要查找的值。 function get_address()
應該返回 self.address。
這是我的建議:
class Person:
def __init__(self, n, a, p):
self.name = n
self.address = a
self.phone = p
def set_name(self, n):
self.name = n
def set_address(self, a):
self.address = a
def set_phone(self, p):
self.phone = p
def get_name(self):
return self.name
def get_address(self):
return self.address
def get_phone(self):
return self.phone
def main():
n = input('Enter Customer Name: ')
a = input('Enter the Customer Address: ')
p = input('Enter the Customer Phone Number: ')
person = Person(n, a, p) # create the instance
# get attributes of instantiated object
print(person.get_person())
print(person.get_address())
print(person.get_phone())
main()
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