Intro to types/classes/objects

In [10]:

    

s = 'i am a string'
type(s)


    

    
Out[10]:





str

In [11]:

    

type(4)


    

    
Out[11]:





int

In [12]:

    

type(2.5236)


    

    
Out[12]:





float

In [13]:

    

type([1,2,3,4,5])


    

    
Out[13]:





list

In [14]:

    

type({'a':4, 'b':5})


    

    
Out[14]:





dict

In [70]:

    

import copy

class MyObject(object):
    def __init__(self, x, y=None):
        
        self.x = x
        
        if y is not None:
            self.y = y
        
    def addme(self):
        return self.x + self.y
    
    def copy(self):
        return copy.copy(self)
    
class MyStringObject(MyObject):
    def __init__(self, x, y):
        if not (type(x)==str and type(y)==str):
            raise TypeError('you can only pass strings')
        self.x = x
        self.y = y


    

In [98]:

    

import numpy as np

class Point(object):
    def __init__(self, x, y):
        self.x = x
        self.y = y
        
    def distance_from_origin(self):
        return np.sqrt(self.x**2 + self.y**2)
    
    def __add__(self, other):
        newx = self.x + other.x
        newy = self.y + other.y
        return Point(newx, newy)

class FunInt(int):
    def __add__(self, other):
        print 'hahaha gotcha---sucker!'
        return self.real - other.real


    

In [101]:

    

x = FunInt(4)
y = FunInt(7)


    

In [102]:

    

x + y


    

    




hahaha gotcha---sucker!






    
Out[102]:





-3

In [89]:

    

p1 = Point(3,4)
p2 = Point(5,6)


    

In [90]:

    

p3 = p1 + p2


    

    




i am a pumpkin!

In [85]:

    

p3.x, p3.y


    

    
Out[85]:





(8, 10)

In [87]:

    

type(2 + 2)


    

    
Out[87]:





int

In [ ]:

    




    

In [ ]:

    




    

In [71]:

    

objs = MyStringObject('a','b')


    

In [72]:

    

objs.addme()


    

    
Out[72]:





'ab'

In [ ]:

    




    

In [64]:

    

obj = MyObject(6)
print obj.y


    

    




---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-64-70bd13ac7189> in <module>()
      1 obj = MyObject(6)
----> 2 print obj.y

AttributeError: 'MyObject' object has no attribute 'y'

In [59]:

    

obj = MyObject(5,6)
obj2 = MyObject(7,8)


    

In [60]:

    

copyobj = obj.copy()


    

In [61]:

    

copyobj.x = 1230


    

In [62]:

    

print copyobj.x
print obj.x


    

    




1230
5

In [45]:

    

import numpy as np

x = np.arange(10)
print x


    

    




[0 1 2 3 4 5 6 7 8 9]

In [46]:

    

y = x.copy()
y[4] = 1000
print x


    

    




[0 1 2 3 4 5 6 7 8 9]

In [30]:

    

obj.x, obj.y


    

    
Out[30]:





(5, 6)

In [31]:

    

obj.addme()


    

    
Out[31]:





11

In [21]:

    

obj2.x


    

    
Out[21]:





7

In [22]:

    

d = dict(r=4, x=7)


    

In [23]:

    

type(d)


    

    
Out[23]:





dict

In [24]:

    

'please split me'.split()


    

    
Out[24]:





['please', 'split', 'me']

In [ ]: