##注意:最左边每个=表示一个空格
class Complex:
====def __init__(self,r,i):
========self.r=r
========self.i=i
====def add(self,c):
========self.r+=c.r
========self.i+=c.i
====def show(self):
========print('{}{}{}i'.format(self.r,'+' if self.i>0 else '',self.i))
c1=Complex(2,3)
c2=Complex(8,-1)
c1.add(c2)
c1.show()