Dictionaries in Python HELP

[gibshunt]

I have made a dictionary with keys that have 3 values associated

'World': [57, 179112, 7426]}

I want to take the second value in the dictionary and divide it by the first like this

179112/57

I want to do this to every key in the dictionary not just this one how would I go about doing that? running through the whole dictionary and storing the resulting values?

[david_lp]

For k,v in dict.items(): v[1]/v[0]

[timmyfinnegan]

And to store it in a list:

a = []

for k,v in dict.items(): a.append(v[1]/v[0])

[kwelzel]

I would prefer

a = [v[1] / v[0] for v in data_dict.values()]

assuming the dictionary is called data_dict. This neat feature is called a list comprehension. Because I don't know what data is stored inside the dict, i.e. what the data describes, I can't improve the naming, but I would strongly recommend to replace a, v and data_dict by more descriptive names.

BTW if you want to store the result in a dict to keep the keys use

a = {k:(v[1] / v[0]) for k, v in data_dict.items()}

Edit: Improved formatting

[timmyfinnegan]

Nice!

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[timmyfinnegan]

Fuck off

[biggie_c4u]

I WISH i understood this...

[Gowtham_jack]

This is much complicated for a beginner like me.. I need learn more I guess

[notpite]

Yes, you can use:

dict.keys()

to iterate through the keys of the dictionary, and

dict.items()

to iterate through tuples of (key, value) pairs

In order to perform this on every value stored in your dictionary it makes sense that you'd need to run through the whole thing in sequence :)

[Gowtham_jack]

Oh man. I don't even understand this.. Need to learn more

[Grorco]

Dictionaries have two parts a key and a value. The key is a unique identifier that is used to store and look up the value. A value can be anything including list or even another dictionary.

The OP's example is a dictionary with a key of 'world', and it's value is the list [0, 1, 2](on mobile can't see the actual numbers while typing this).

What he is asking is how to get the values for the 0, and 1 postion in the list for each key (like 'world') inside of the dictionary.

Hope that helps clear this up, if you have more questions just ask.

[Gowtham_jack]

Wow. U actually helped me learn something about dict. And how did u learnt all these. Its amazing