You need to check all numbers from 2 to n-1 (to sqrt(n) actually, but ok, let it be n). If n is divisible by any of the numbers, it is not prime. If a number is prime, print it. You can write the same much shorter and more pythonic: As I’ve said already, it would … Read more
either: or, .reset_index: so, if you have a multi-index frame with 3 levels of index, like: and you want to convert the 1st (tick) and 3rd (obs) levels in the index into columns, you would do:
It’s not smart enough to realize it’s still a “vector” in math terms. Say rather that it’s smart enough to recognize a difference in dimensionality. 🙂 I think the simplest thing you can do is select that row positionally using iloc, which gives you a Series with the columns as the new index and the values … Read more
You can convert all elements of id to str using apply Edit by OP: I think the issue was related to the Python version (2.7.), this worked:
Rather than create 2 temporary dfs you can just pass these as params within a dict using the DataFrame constructor: There are lots of ways to construct a df, see the docs