class MobilePhone:
    def dial(self, phone):
        print("mobile phone dialed", phone)
        
class Fax:
    def dial(self, phone):
        print("fax dialed", phone)
        
class NotAPhone:
    pass

for obj in [MobilePhone(), Fax(), NotAPhone()]:
    obj.dial("053-55555")

mobile phone dialed 053-55555
fax dialed 053-55555

    ---------------------------------------------------------------------------

    AttributeError                            Traceback (most recent call last)

    <ipython-input-6-12fa7657042c> in <module>
          1 for obj in [MobilePhone(), Fax(), NotAPhone()]:
    ----> 2     obj.dial("053-55555")
    

    AttributeError: 'NotAPhone' object has no attribute 'dial'

numpy.dot

    ---------------------------------------------------------------------------

    NameError                                 Traceback (most recent call last)

    <ipython-input-7-4b1a855c9c7d> in <module>
    ----> 1 numpy.dot
    
    NameError: name 'numpy' is not defined

import math

math.sqrt(-100)

    ---------------------------------------------------------------------------

    ValueError                                Traceback (most recent call last)

    <ipython-input-9-b5dc45673dc3> in <module>
    ----> 1 math.sqrt(-100)
    
    ValueError: math domain error