Problem Set 2
^^^^^^^^^^^^^

.. admonition:: Problem 2.1
   :class: Note

   Write a Python program which functions as a "simple" calculator. The calculator should be able to ``add`` two numbers, ``subtract`` two numbers, ``multiply``, ``divide``, and evaluate ``exponents`` (i.e. 10 ^ 5).

.. admonition:: Problem 2.2
   :class: Note

   Write a Python *function* called ``hail`` that takes an integer as its argument. If the integer is even, return the value of the integer multiplied by 2. If it's odd, return the value of the integer multiplied by 3 and with 1 added. That is: ``n`` goes to ``2*n`` if even, ``3*n+1`` if odd. HINT: You may want to look up the Python modulus operator: ``%``.    

.. admonition:: Problem 2.3
   :class: Note

   Write a Python *function* which reads a csv file into a dataframe, then saves that dataframe as a new csv file (with a different name).