#  Demonstration code for Scientific Computing class,
#  http://www.math.nyu.edu/faculty/goodman/teaching/SciComp2022/
#  Helpers.py
#  uses Python 3 and Numpy
#  Python Classes Demo

#  Some functions used in the demo of Python Classes

def myNames(nameList):
   """The input nameList is a list of strings (names).
      The output is a list of all the strings that do not
      have "__" twice, as __init__
      In a namelist for a class, the __***__ names are put there
      by the system, not by the user defining the class. """
      
#  I really should have used Python string matching to look for strings
#  that don't match __***__, but I could not figure out the string
#  matching system -- the documentation is terrible (or I'm an idiot?)!
#  This should work most of the time, unless a user creates a name like
#  "best__burger__in__town" instead of "best_burger_in_town".
      
   myNameList = []
   for name in nameList:
      if ( name.count("__") < 2 ):
         myNameList.append(name)
   return myNameList
   
   
def printHello():
   """A function that prints: Hello, classy world"""
   print("    Hello, classy world.")