PyMongo create_index only if it does not exist

Question

In a Python script using PyMongo, an index is created for a collection using the line

myCollection.create_index('Datetime', unique=True)

However this throws an error the next time the script is executed because the index already exist.

Question: Is there a way to check for the existance of an index before deciding whether to call create_index?

Answer 1

In PyMongo 3.6.0 and later, calling create_index will not recreate the index if it already exists and will not throw an error. The index creation will just be ignored if the index already exists.