calling Class method inside the Class definition

[tkj80]

Hi,

I'm writing a class Sunday
1) to get datetime of previous Sunday (method)
2) to return the following attributes:
   a) day (in string)
   b) month (in string)
   c) year (in string)

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class Sunday:   def __init__(self, dayname, start_date=datetime.today()):      self.dayname = dayname      self.date = start_date      self.day = start_date.day      self.month = start_date.month      self.year = start_date.year      self.weekday = start_date.weekday()      self.weekdays = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday']   def get_Prev(self):      day_num = self.weekday      day_num_target = self.weekdays.index(self.dayname)      days_ago = (7 + day_num - day_num_target) % 7      if days_ago == 0:         days_ago = 7      self.date = self.date - timedelta(days=days_ago)      self.day = self.date.day      self.month = self.date.month      self.year = self.date.year      self.weekday = self.date.weekday()   def get_Arg(self):      self.date = get_Prev()

I then did the following:

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sun = Sunday("Sunday")   sun.get_Arg()

However, I got the following error message.

Error:
NameError: name 'get_Prev' is not defined

I tried the following to see if I get a different result.

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def get_Arg(self):    self.date = self.get_Prev()

I then tested out the following:

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sun = Sunday("Sunday") sun.get_Arg() type(sun.date)

Output:
<class 'NoneType'>

No error message but I was thinking that it will call get_Prev() method within the class but it doesn't like it did.
Wonder if someone could point out to me, how I could call get_Prev method within the class? I'm trying to define a second method get_Arg() so that I could add a few more lines of codes to convert the attributes day, month and year into string. E.g. sun.day_str, sun.month_str, sun.year_str

[Mekire]

This is correct (syntactically):

1 2	def get_Arg(self):  self.date = self.get_Prev()

The reason you are ending up with none is that the method get_prev doesn't actually return anything so you are setting date to none.