Python will default to ASCII as standard encoding if no other encoding hints are given.

To define a source code encoding, a magic comment must
be placed into the source files either as first or second
line in the file, such as:

      # coding=<encoding name>

or (using formats recognized by popular editors)

      #!/usr/bin/python
      # -*- coding: <encoding name> -*-

or

      #!/usr/bin/python
      # vim: set fileencoding=<encoding name> :

More precisely, the first or second line must match the regular
expression "coding[:=]\s*([-\w.]+)". The first group of this
expression is then interpreted as encoding name. If the encoding
is unknown to Python, an error is raised during compilation. There
must not be any Python statement on the line that contains the
encoding declaration.

To aid with platforms such as Windows, which add Unicode BOM marks
to the beginning of Unicode files, the UTF-8 signature
'\xef\xbb\xbf' will be interpreted as 'utf-8' encoding as well
(even if no magic encoding comment is given).

If a source file uses both the UTF-8 BOM mark signature and a
magic encoding comment, the only allowed encoding for the comment
is 'utf-8'.  Any other encoding will cause an error.

class Player:  
    def __init__(self,name,x,y):  
        self.name=name  
        self.x=x  
        self.y=y  
    def zero(self):  
        self.x=0  
        self.y=0  
        return self # 返回自身，使用链式调用  
    def moveX(self,offset):  
        self.x+=offset  
        return self # 返回自身，使用链式调用  
        # return type(self)(self.name,self.x+offset,self.x) # 不改变自身返回新对象的链式调用  
    def moveY(self,offset):  
        self.y+=offset  
        return self # 返回自身，使用链式调用  
    def __str__(self):  
        return "%s:(%s,%s)"%(self.name,self.x,self.y)  
  
p=Player("player1",5,5)  
(  
   p.zero()  # 也可以用\
    .moveX(3)  
    .moveY(1)  
)  
# 等价于 p.zero().moveX(3).moveY(1)
print(p)

运行结果