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

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:

>>> d1 = {1: [1]}
>>> d2 = {2: [2]}
>>> d1.update(d2)
>>> d1
{1: [1], 2: [2]}

A change to a value that's present in both dictionaries will be visible in both:

>>> d1[2].append('appended')
>>> d1
{1: [1], 2: [2, 'appended']}
>>> d2
{2: [2, 'appended']}

This is the same as copying the value over or making a new dictionary with it, i.e.

>>> d3 = {1: d1[1]}
>>> d3[1].append('appended from d3')
>>> 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

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

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

Examples related to python