toby-p

def compound(initial, percent, years):
    if years>0:
        initial+=(initial*percent)
        years-=1
        return compound(initial, percent, years)
    else:
        return initial

toby-p

import datetime
import pytz
import dateutil
import os

def datetime_to_str(datetime_obj, date_format="%Y_%m_%d_%H_%M_%S"):
    """Convert a `datetime.datetime` object to a string in the desired format.

    Reference for string formatting dates available here:
        http://strftime.org/

toby-p

import string
import random

def random_str(l=100):
    """Return a random string of length `l` to use as a temporary unique
    variable name or Pandas DataFrame column name."""
    s = random.choice(string.ascii_letters) # 1st letter = alpha so can be used as var name.
    return s+"".join(random.choice(string.ascii_letters+string.digits) for i in range(l-1))

toby-p

// I always forget this so saving it here; taken from:
// http://chris-said.io/2016/02/13/how-to-make-polished-jupyter-presentations-with-optional-code-visibility/

// This script hides the code and leaves a button to toggle it on/off:
<script>
  function code_toggle() {
    if (code_shown){
      $('div.input').hide('500');
      $('#toggleButton').val('Show Code')
    } else {