class Person:
    def __init__(self, name, gender, otherVar, otherVar2):
        self.name = name
        self.gender = gender
        self.otherVar = otherVar
        self.otherVar2 = otherVar2
        ## also more variables if that makes a difference

John = Person("John", boy, otherVar, otherVar2)
Jane = Person("Jane", girl, otherVar, otherVar2)   ## etcetera


myList = [John, Jane, Mary, Derek, Bob, Sue]
simpleThingThatIdoNotUnderstand():                 ## removes all the
                                                   ## girls
myList = [John, Derek, Bob]

# removes all people of the specified gender
def removePeopleByGender(people, gender):
   output = []

   for person in people:
       # assumes person.gender and gender are the same data type
       if (person.gender != gender):
           output.append(person)

   return output

boys = [person for person in myList if person.gender == boy]

myList = [John, Jane, Mary, Derek, Bob, Sue]

new_list = [<expression> for <variable> in <original_list> if <condition>]

new_list = []
for <variable> in <original_list>:
    if <condition>:
        new_list.append(<expression>)