In [14]:

    

# values are used in expressions (e.g., 1 + 1)
'fish'


    

    
Out[14]:





'fish'

In [15]:

    

# the result of an expression is typically another value
(1 + (1)) + 1


    

    
Out[15]:





3

In [16]:

    

# values are of various types (e.g., int, double, string, list, boolean, function)
False


    

    
Out[16]:





False

In [17]:

    

# values can be tested for equality (e.g., 3 == 3.0)
3 > 4


    

    
Out[17]:





False

In [18]:

    

# variables are names for values
d = 5
d


    

    
Out[18]:





5

In [19]:

    

d = 'fish'
d


    

    
Out[19]:





'fish'

In [20]:

    

# variables are created by assignment and do not need to be declared


    

In [21]:

    

# variables do not have types


    

In [22]:

    

# a special value is "None" which usually indicates information that is not present

a = None
a is None


    

    
Out[22]:





True

In [23]:

    

3 == 2.9999999999999999999999999


    

    
Out[23]:





True

In [24]:

    

3 is 2.999999999999999999999999999999


    

    
Out[24]:





False