>>> class Person(object):
...     #this is method
...     def personMethod(self):
...         pass
... 

以上，#this is method就是局部注释。

在函数、类或者文件开头的部分写文档字符串说明，一般采用三重引号。这样写的最大好处是能够用 help() 函数看。

"""This is python lesson"""

def start_func(arg):
    """This is a function."""
    pass

class MyClass:
    """Thi is my class."""
    def my_method(self,arg):
        """This is my method."""
        pass