Python dictionary replace values

Question

I have a dictionary with 20 000 plus entries with at the moment simply the unique word and the number of times the word was used in the source text  Dante s Divine Comedy in Italian    I would like to work through all entries replacing the value with an actual definition as I find them  Is there a simple way to iterate through the keywords that have as a value a number in order to replace  as I research the meaning    The dictionary starts     corse   378   cielo    209   mute    16   torre    11   corsa   53   assessin   21   corso   417   Tolomea   21     etc    Sort of an application that will suggest a keyword to research and define

User · Answer

I think this may help you solve your issue.

Imagine you have a dictionary like this:

dic0 = {0:"CL1", 1:"CL2", 2:"CL3"}

And you want to change values by this one:

dic0to1 = {"CL1":"Unknown1", "CL2":"Unknown2", "CL3":"Unknown3"}

You can use code bellow to change values of dic0 properly respected to dic0t01 without worrying yourself about indexes in dictionary:

for x, y in dic0.items():
    dic0[x] = dic0to1[y]

Now you have:

>>> dic0
{0: 'Unknown1', 1: 'Unknown2', 2: 'Unknown3'}

User · Answer

If you iterate over a dictionary you get the keys  so assuming your dictionary is in a variable called data and you have some function find definition   which gets the definition  you can do something like the following   for word in data      data word    find definition word

User · Answer

via dict update   function  In case you need a declarative solution  you can use dict update   to change values in a dict   Either like this   my dict update   key1    value1    key2    value2      or like this   my dict update key1  value1   key2  value2     via dictionary unpacking  Since Python 3 5 you can also use dictionary unpacking for this   my dict       my dict   key1    value1    key2    value2     Note  This creates a new dictionary   via merge operator or update operator  Since Python 3 9 you can also use the merge operator on dictionaries   my dict   my dict     key1    value1    key2    value2     Note  This creates a new dictionary   Or you can use the update operator   my dict      key1    value1    key2    value2

User · Answer

You cannot select on specific values  or types of values   You d either make a reverse index  map numbers back to  lists of  keys  or you have to loop through all values every time   If you are processing numbers in arbitrary order anyway  you may as well loop through all items   for key  value in inputdict items          do something with value     inputdict key    newvalue   otherwise I d go with the reverse index   from collections import defaultdict  reverse   defaultdict list  for key  value in inputdict items        reverse value  append key    Now you can look up keys by value   for key in reverse value       inputdict key    newvalue

[python] Python dictionary replace values

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