What is a good way to find the index of an element in a list in Python?
Note that the list may not be sorted.
Is there a way to specify what comparison operator to use?
The best way is probably to use the list method .index.
For the objects in the list, you can do something like:
def __eq__(self, other): return self.Value == other.Value
with any special processing you need.
You can also use a for/in statement with enumerate(arr)
Example of finding the index of an item that has value > 100.
for index, item in enumerate(arr): if item > 100: return index, item