Jul 21, 2010 · If you want to loop over a dictionary and modify it in iteration (perhaps add/delete a key), in Python 2, it was possible by looping over my_dict.keys(). In Python 3, the iteration has to be over an explicit copy of the keys (otherwise it throws a RuntimeError) because my_dict.keys() returns a view of the dictionary keys, so any change to my ...

Feb 23, 2010 · In a more general case, e.g. if you were adding or removing keys, it might not be safe to change the structure of the container you're looping on -- so using items to loop on an independent list copy thereof might be prudent -- but assigning a different value at a given existing index does not incur any problem, so, in Python 2.any, it's better ...

Nested dictionaries looping using isinstance () and yield function. **isinstance is afunction that returns the given input and reference is true or false as in below case dict is true so it go for iteration.

I would like to iterate over dictionary values that are stored in a tuple. I need to return the object that holds the "CI" value, I assume that I will need some kind of a for loop: z = {'...

May 3, 2017 · Iterating through a dictionary only gives you the keys. You told python to expect a bunch of tuples, and it tried to unpack something that wasn't a tuple (your code is set up to expect each iterated item to be of the form (key,value), which was not the case (you were simply getting key on each iteration).

Mar 7, 2014 · How to iterate over a dictionary by dictionary comprehension to process it. >>> mime_types={ '.xbm': 'image/x-xbitmap', '.dwg': 'image/vnd.dwg', '.fst ...

Nov 23, 2013 · I'm trying to loop through a dictionary, and starting from the first key, it looks its value and loops through each element in the list and doubles it. Once it's done with the list it adds the key ...

Jul 2, 2015 · A single flat dictionary does not satisfy your requirement , you either need a list of dictionaries or a dictionary with nested dictionaries. If you want a list of dictionaries (where each element in the list would be a diciotnary of a entry) then you can make case_list as a list and then append case to it (instead of update) .

Feb 15, 2013 · There are many examples available that show how to find a max value in a dict. I was curious though why the maximum key / value cannot found in this way. from random import randint # Create dict...

Mar 28, 2019 · I need to loop through each dataframe in the dictionary to reindex and resample etc. and the return to the dictionary. The below code works perfectly when I loop through a list of dataframes but I need to maintain the identity of each scenario, hence the dictionary. This is the code that works with a list of dataframes: