How to do an 'inner join' with dictionaries

[Claudio Grondi]

cyborg4 at walla.co.il wrote:
> Let's say I have two dictionaries:
> dict1 is  1:23,  2:76,  4:56
> dict2 is  23:A, 76:B,  56:C
> 
> How do I get a dictionary that is
> 1:A, 2:B, 4:C
> 
Just copy/paste the following source code to a file and run it:
<code>
sourceCodeToExecute = """
dict1 = {  1:23,    2:76,   4:56 }
dict2 = { 23:'A',  76:'B', 56:'C' }
# How do I get a dictionary that is
dict3 = {  1:'A',   2:'B',  4:'C' }

dict4 = {}
for key in dict1.keys():
   dict4[key] = dict2[dict1[key]]
#:for

print 'dict3 == dict4 is', dict3 == dict4
"""

print
print '  execution of following source code: '
print
print '"""',
print sourceCodeToExecute
print '"""'
print
print '  results in output of: '
print
exec(sourceCodeToExecute)
</code>

The core idea of an inner join:
   dict2[dict1[key]]


Hope this helps inspite of the fact there is some more complicated code 
involved, which I provided to show the beauty of Python from the point 
of view of my own style of writing 'tutorial-like' code which explains 
itself by its output.

Claudio