In [2]:

    

# dicts are associations between keys and values notated {}
d = { 'joe': 46, 'tbones': 7 }
d


    

    
Out[2]:





{'joe': 46, 'tbones': 7}

In [3]:

    

d['joe'] = 27
d['joe']


    

    
Out[3]:





27

In [4]:

    

# each key has one value created and modified by assignment


    

In [5]:

    

# many kinds of objects can be used as keys, including strings and integers
## but not all! (e.g., lists)
d = { 1: 'one', 2: 'two' }
d[2]


    

    
Out[5]:





'two'

In [6]:

    

# dicts support "in" w/r/t keys
d['clam'] = 77
'airplane' in d


    

    
Out[6]:





False

In [9]:

    

a = ('joe', 'ctd')
b = ('stace', 'informatics')
d = dict([a,b])
d['joe'] = 'ifcb'
d


    

    
Out[9]:





{'joe': 'ifcb', 'stace': 'informatics'}

In [10]:

    

# strings are immutable and iterable
'python'[2:4]


    

    
Out[10]:





'th'