1+ '''
2+ Created on Aug 6, 2017
3+
4+ @author: Aditya
5+
6+ This program explains the details of generator objects.
7+ '''
8+ 9+ class inclusive_range :
10+ def __init__ (self , * args ): # this method is constructor
11+ nargs = len (args )
12+ if nargs < 1 : raise TypeError ('Requires atleast one argument.' )
13+ elif nargs == 1 :
14+ self .stop = args [0 ]
15+ self .start = 0
16+ self .step = 1
17+ elif nargs == 2 :
18+ self .start , self .stop = args
19+ self .step = 1
20+ elif nargs == 3 :
21+ self .start , self .stop , self .step = args
22+ else : raise TypeError ('Expected atmost 3 arguments. Got {} arguments.' .format (nargs ))
23+ 24+ def __iter__ (self ):
25+ # this method creates the iterator object and we can thus put our generator function over here.
26+ i = self .start
27+ while i <= self .stop :
28+ yield i
29+ i += self .step
30+ 31+ def main ():
32+ o = range (25 ) # range object
33+ print ('Type of range object: ' , type (o ))
34+ for i in o : print (i , end = ' ' ) # range object used in context of iterator
35+ print ('\n Note: range object is a generator.' )
36+ print ('Also range is exclusive iterator, i.e., it excludes the upper limit.' )
37+ 38+ print ()
39+ print ('Illustrating Generator Object in Python.' )
40+ o = inclusive_range (25 )
41+ for i in o : print (i , end = ' ' )
42+ print ()
43+ 44+ if __name__ == '__main__' :main ()
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