How to delete any value of a key in python using dictionaries?

Question

for example: a = {1:'hello' , 2:'bye'}

suppose I want to delete the element 2:'bye' through its value 'bye' , so can anyone help me by giving a piece of code.

thank you

What do you mean "through it's value"? You mean that all you have is the value? Well, then you have to find the key corresponding to that value. This will be a linear time operation (unless you create a reverse mapping, which of course, will require more memory). — juanpa.arrivillaga, Nov 03 '20 at 09:50
Does this answer your question? [Removing entries from a dictionary based on values](https://stackoverflow.com/questions/15158599/removing-entries-from-a-dictionary-based-on-values) — Tom Wojcik, Nov 03 '20 at 09:52

score 0 · Accepted Answer · answered Nov 03 '20 at 09:57

0

for what I know you can do it like this

for i in a: # the dictionary
 if a[i] == 'bye':
   del a[i]

Hopefully this helps

answered Nov 03 '20 at 09:57

Anmol Dudani

1

This is a bad idea, as deleting while iterating generally leads to problems. See the duplicate. – Thierry Lathuille Nov 03 '20 at 10:13
well you can do this then a.pop(i) – Anmol Dudani Nov 03 '20 at 13:35
thanks mate. this really helped me – Harmaan Nov 04 '20 at 13:55

1 Answers1