以下代码均采用Python 3.5.2编写。新建一个名为HelloWorld.py的文件，当然名字无所谓，输入以下代码：
#Class class Bird(object): feather= True reproduction="egg" def chirp(self, sound="some sound"): print(sound) def set_color(self,color): self.color=color return color #property class Chicken(Bird): fly=False def __init__(self, age): self.age=age def get_adult(self): if self.age>1.0: return True else: return False adult=property(get_adult) summer=Chicken(2) print(summer.adult) class num(object): def __init__(self, value): self.value=value def get_neg(self): return -self.value def set_neg(self, value): self.value=-value def del_neg(self): print("value is also deleted") del self.value neg=property(get_neg,set_neg,del_neg,"I'm negative") x=num(1.1) print(x.neg) x.neg=-22 print(x.value) print(num.neg.__doc__) del x.neg #__getattr__ class Goose(Bird): fly=True def __init__(self, age): self.age=age def __getattr__(self,name): if name=="adult": if self.age>1.0: return True else: return False else: raise AttributeError(name) summer = Goose(2) print(summer.adult) summer.age=0.5 print(summer.adult) #__getattr__ can only check the attributes not in __dict__, __getattribute__ can check all of the attributes #parameter trans def example_f(x): print(id(x)) x=100 print(id(x)) a=1 print(id(a)) example_f(a) print(a) def example_f2(x): x[0]=100 print(x) a=[1,2,3] example_f2(a) print(a) #func parameter def square_sum(a,b): return a**2+b**2 def cubic_sum(a,b): return a**3+b**3 def argument_demo(f,a,b): return f(a,b) print(argument_demo(square_sum,3,5)) print(argument_demo(cubic_sum,3,5)) #func return def line_conf(): def line(x): return 2*x+1 return line my_line=line_conf() print(my_line(5))将后面尚未读到的代码注释掉，一段一段查看执行效果，即可轻松入门Python。
