I'm trying to learn OOP but I'm getting very confused with how I'm supposed to run the methods or return values. In the following code I want to run `read_chapters()` first, then `sendData()` with some string content that comes from `read_chapters()`. Some of the solutions I found did not use `__init__` but I want to use it (just to see/learn how i can use them).

How do I run them? Without using `__init__`, why do you only return 'self'? 

```
import datetime

class PrinceMail:

    def __init__(self):
        self.date2 = datetime.date(2020, 2, 6)
        self.date1 = datetime.date.today()
        self.days = (self.date1 - self.date2).days
        self.file = 'The_Name.txt'
        self.chapter = '' # Not sure if it would be better if i initialize chapter here-
                           # or if i can just use a normal variable later

    def read_chapters(self):
        with open(self.file, 'r') as book:
            content = book.readlines()
            indexes = [x for x in range(len(content)) if 'CHAPTER' in content[x]]
            indexes = indexes[self.days:]
            heading = content[indexes[0]]
            try:
                for i in (content[indexes[0]:indexes[1]]):
                    self.chapter += i # can i use normal                      var and return that instead?
                    print(self.chapter)
            except IndexError:
                for i in (content[indexes[0]:]):
                    self.chapter += i
                    print(self.chapter)
        return self????? # what am i supposed to return? i want to return chapter
                         # The print works here but returns nothing.

    # sendData has to run after readChapters automatically
    def sendData(self):
         pass
         #i want to get the chapter into this and do something with it

    def run(self):
        self.read_chapters().sendData()
        # I tried this method but it doesn't work for sendData
        # Is there anyother way to run the two methods?

obj = PrinceMail()
print(obj.run())
#This is kinda confusing as well

```