I want to define a class and create an object instance. But always get error. The code goes like this:
class complex:
def _init_(self,realpart,imagpart):
self.r=realpart
self.i=imagpart
x=complex(3,4)
the error message is:
Traceback (most recent call last):<br>
File "pyshell#5", line 1, in "module" <br>
x=complex(3,4) <br>
TypeError: object.__new__() takes no parameters
so what is the problem?
thanks for your reading!
_init_ should have two underscores on each side:
>>> class complex:
... def __init__(self,realpart,imagpart):
... self.r=realpart
... self.i=imagpart
...
>>> x=complex(3,4)
Also, just so you know, Python already has a complex type:
>>> 2+3j
(2+3j)
>>> complex(2, 3)
(2+3j)
__init__ supposed to have 2 underscores surrounding it rather than 1
So
def _init_(self,realpart,imagpart):
should be
def __init__(self,realpart,imagpart):
One more suggesting, instead of multiple assignments, tuple unpacking would be more readable and marginally efficient
Prefer new Type Class construct, which derives from object
PEP8 suggests to use CamelCase for Class Names
Always use the batteries if available instead of rolling your own. Python already supports complex types by default
SO here it goes
class complex(object):
def __init__(self,realpart,imagpart):
self.r, self.i=realpart, imagpart
__init__not_init_3+4jfor example