关于python类和实例的一些尝试

Python 3.6.0 (v3.6.0:41df79263a11, Dec 23 2016, 08:06:12) [MSC v.1900 64 bit (AMD64)] on win32 Type "copyright", "credits" or "license()" for more information. >>> a=5 >>> b=5 >>> de Traceback (most recent call last): File "<pyshell#2>", line 1, in <module> de NameError: name 'de' is not defined >>> def x(a,b): return a,b >>> x(a,b) (5, 5) >>> type(x(a,b)) <class 'tuple'> >>> def y(a,b): return [a,b] >>> y(a,b) [5, 5] >>> x(a,b)[0] 5 >>> class student(object): def sum(self): a=5 b=6 return a+b >>> student.sum <function student.sum at 0x0000025F1939A9D8> >>> class student(object): def __init__(self): self.a=5 self.b=6 def MySum(self): return self.a+self.b >>> c=student.MySum >>> c <function student.MySum at 0x0000025F1939AAE8> >>> class student(object): def MySum(self,a,b): return a+b >>> c=student.MySum(5,6) Traceback (most recent call last): File "<pyshell#31>", line 1, in <module> c=student.MySum(5,6) TypeError: MySum() missing 1 required positional argument: 'b' >>> class student(object): def __init__(self): self.mySum=0 def MySum(self,a,b): self.mySum=a+b return self.mySum >>> c=student.MySum(5,6) Traceback (most recent call last): File "<pyshell#35>", line 1, in <module> c=student.MySum(5,6) TypeError: MySum() missing 1 required positional argument: 'b' >>> c=student() >>> c.MySum(5,6) 11 >>> class student(object): def __init__(self,a,b): self.mySum=a+b return self.mySum >>> student(5,6) Traceback (most recent call last): File "<pyshell#41>", line 1, in <module> student(5,6) TypeError: __init__() should return None, not 'int' >>> class student(object): def __init__(self,a,b): self.mySum=a+b >>> student(5,6).mySum 11 >>>