Python Taskbook Level 2.5

Given a certain line, for example, like this:

Get the set of positions of all zeros in this string.

Given a string:

Remove every third character from this line. In our case, we should get the following:

There is a certain list given, for example, this one:

Divide the sum of the elements in even positions by the sum of the elements in odd positions.

The date is given in the following format:

Convert this date to the following tuple: