syntax for creating a dictionary into another dictionary in python

Question

Possible Duplicate    syntax to insert one list into another list in python       How could be the syntax for creating a dictionary into another dictionary in python

User · Answer

You can declare a dictionary inside a dictionary by nesting the {} containers:

d = {'dict1': {'foo': 1, 'bar': 2}, 'dict2': {'baz': 3, 'quux': 4}}

And then you can access the elements using the [] syntax:

print d['dict1']           # {'foo': 1, 'bar': 2}
print d['dict1']['foo']    # 1
print d['dict2']['quux']   # 4

Given the above, if you want to add another dictionary to the dictionary, it can be done like so:

d['dict3'] = {'spam': 5, 'ham': 6}

or if you prefer to add items to the internal dictionary one by one:

d['dict4'] = {}
d['dict4']['king'] = 7
d['dict4']['queen'] = 8

User · Answer

Do you want to insert one dictionary into the other  as one of its elements  or do you want to reference the values of one dictionary from the keys of another   Previous answers have already covered the first case  where you are creating a dictionary within another dictionary   To re-reference the values of one dictionary into another  you can use dict update    gt  gt  gt  d1    1   1    gt  gt  gt  d2    2   2    gt  gt  gt  d1 update d2   gt  gt  gt  d1  1   1   2   2     A change to a value that s present in both dictionaries will be visible in both    gt  gt  gt  d1 2  append  appended    gt  gt  gt  d1  1   1   2   2   appended     gt  gt  gt  d2  2   2   appended      This is the same as copying the value over or making a new dictionary with it  i e    gt  gt  gt  d3    1  d1 1    gt  gt  gt  d3 1  append  appended from d3    gt  gt  gt  d1 1   1   appended from d3

User · Answer

dict1       dict1  dict2         print dict1   gt  gt  gt    dict2          this is commonly known as nesting iterators into other iterators I think

[python] syntax for creating a dictionary into another dictionary in python

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