What is the best way to remove a dictionary item by value in python? [duplicate]

Answer 1

You can iterate over a copy and do a lookup:

for k in myDict.copy():
    if myDict[k] == 42:
        del myDict[k]

Or only copy the keys:

myDict = {1:"egg", "Answer":42, 8:14, "foo":42}
for k in list(myDict):
    if myDict[k] == 42:
        del myDict[k]
print(myDict)
{8: 14, 1: 'egg'}

Which if you want to mutate the original dict should be the most efficient.