Passing an object of a class to a method in the class - class

Question

I wrote a simple date class for practice but I can't seem to pass the objects in the class to the methods within the class. The class is supposed to be able to accept test dates, correct them if they are out of range and then print the correct date. Here is the code
class Date:
month = int
day = int
year = int
def setDate(self, month, day, year)
HIGH_MONTH = 12
HIGHEST_DAYS = ['none',31,29,31,30,31,30,31,31,30,31,30,31]
if month > HIGH_MONTH:
month = HIGH_MONTH
elif month < 1:
month = 1
else:
month = month
if day > HIGHEST_DAYS[month]:
day = HIGHEST_DAYS[month]
elif day < 1:
day = 1
else:
day = day
def showDate(self):
print 'Date:',month,'/',day,'/',year
#These are my tests
birthday=Date()
graduation=Date()
birthday.month=6
birthday.day=24
birthday.year=1984
graduation.setDate(5,36,2016)
birthday.showDate()
graduation.showDate()
What I get is a NameError: global name 'month' is not defined

Answer 1

In order for you to use a "global" variable in your class, assign the variables to self.variable_name as such:
class Date:
month = int
day = int
year = int
def setDate(self, month, day, year):
HIGH_MONTH = 12
HIGHEST_DAYS = [None,31,29,31,30,31,30,31,31,30,31,30,31]
if month > HIGH_MONTH:
month = HIGH_MONTH
elif month < 1:
month = 1
else:
month = month
if day > HIGHEST_DAYS[month]:
day = HIGHEST_DAYS[month]
elif day < 1:
day = 1
else:
day = day
self.year = year
self.month = month
self.day = day
def showDate(self):
print 'Date:',self.month,'/',self.day,'/',self.year
>>> birthday=Date()
>>> graduation=Date()
>>> birthday.month=6
>>> birthday.day=24
>>> birthday.year=1984
>>> graduation.setDate(5,36,2016)
>>> birthday.showDate()
Date: 6 / 24 / 1984
>>> graduation.showDate()
Date: 5 / 31 / 2016
>>>