Working with Generators of Python
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#enumerate#seasons=['spring','summer','autumn','winter']seasons=('spring','summer','autumn','winter') # env tuple is works ,but after enumerate it will be listprint seasonsprint list(enumerate(seasons)) #[(0, 'spring'), (1, 'summer'), (2, 'autumn'), (3, 'winter')]print list(enumerate(seasons,start=1)) #[(1, 'spring'), (2, 'summer'), (3, 'autumn'), (4, 'winter')]# Eval Function why ???? what can i do with funx =1print eval('x==1') # Trueprint eval('x + 1')print x +1#iter functionswith open('myfile.txt') as fh: for line in iter(fh.readline,''): # fh.readline() not works here print linefh2 = open("myfile.txt") # for personal I like this one ,it much mor clearfor line in fh2: # it is works print line#Nested Sequencesplain =['spring','autumn','summer','winter']print plain[1][1] # usea = [('alxs','home')]print seaprint sea[0][0] #alxsprint sea[0][0][0] # got a#generator functionsdef main(): print 'this is a smaple generator function ' for i in range(25): print (i) # not got 25 print inclusive_range(0,25,1) #<generator object inclusive_range at 0x00000000024D0510> for i in inclusive_range(0,25,1): # this function has no connection with function range print i print '---------------------------------------' #o =inclusive_ranges() #TypeError: requires at least 1 param #one =inclusive_ranges(6) #two =inclusive_ranges(1,4) #three =inclusive_ranges(2,7,2) four =inclusive_ranges(1,4,6,8) #TypeError: expected at most 3 param received 4 for i in four :print idef inclusive_range(start,stop,step): i = start while i <=stop: yield i #print i+100 i+=step#using Gnerators with classesclass inclusive_ranges: def __init__(self,*args): numargs =len(args) if numargs < 1 : raise TypeError('requires at least 1 param') elif numargs == 1 : self.stop=args[0] self.start = 0 self.step =1 elif numargs ==2: self.step = 1 self.start = args[0] self.stop =args[1] #(self.start,self.stop) =args elif numargs ==3: (self.start,self.stop,self.step)=args else:raise TypeError('expected at most 3 param received {}' .format(numargs)) def __iter__(self): i =self.start while i <= self.stop: yield i i += self.stepmain()
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