Friday 18 August 2017

Python 2.7 Vs 3.4

2.7) print "hello world"      
3.4) print("hello world")

2.7) raw_input("Enter")->str  
       input("enter") ->int/eval
3.4) input("Enter")->str


2.7) range(1,11)-mallocs      
       xrange(1,11)-doest malloc  
3.4) list(range(1,11))-mallocs
       range(1,11)-doest malloc            


2.7) res=map(fun,arr)
3.4) res=list(map(fun,arr))                   


2.7) list.sort(cmp=None, key=None, reverse=False) 
3.4) list.sort(key=None, reverse=False)


2.7) file object            
       fob=open("one.txt","r")      
       OR
       fob=file("one.txt","r")

3.4) io.TextIOWrapper
       fob=open("one.txt","r")                      


2.7)  filenotfoud-IOError      
        others     -IOError        
3.4)  filenotfound
       -FileNotFoundError
        Invalid operation
       -io.UnsupportedOpceration         


2.7) every class should be a derived class of "object" class              
3.4)
it is implicitly derived from "object" class    


2.7) super(CURRCLASS,self).fn()
3.4) super().fn()                                  


2.7) string is ASCII & Unicode
3.4) by default everything is UNICODE


2.7) res=generator()      
       print res.next()              
       print res.next()              
3.4) res=generator()
       print(res.__next__())
       print(res.__next__())                   

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