On 07/30/2018 07:20 AM, Sunil Tech wrote: > Hi Team, > > I am investigating how the memory allocation happens in Python
There are several things going on here, but the main thing to know is: but Python language _implementations_ optimize when they can and think it makes sense. So don't draw too many conclusions from this experiment... The python.org Python only creates one copy of small integer objects, I think I've read somewhere the range is -5 to 256. Strings get some kind of the same treatement - short strings may get entries in the bytecode generated (.pyc files) allowing references to be to the same id (id does not necessarily mean memory location, by the way) Pretty much, don't count on this behavior. Other Pythons may not do the same things. There is some control over whether strings are interned, see sys.intern() > For Eg: > *Case 1:* > >>>> a = 10 >>>> b = 10 >>>> c = 10 >>>> id(a), id(b), id(c) > (140621897573616, 140621897573616, 140621897573616) >>>> a += 1 >>>> id(a) > 140621897573592 > > > *Case 2:* > >>>> x = 500 >>>> y = 500 >>>> id(x) > 4338740848 >>>> id(y) > 4338741040 > > > *Case 3:* > >>>> s1 = 'hello' >>>> s2 = 'hello' >>>> id(s1), id(s2) > (4454725888, 4454725888) >>>> s1 == s2 > True >>>> s1 is s2 > True >>>> s3 = 'hello, world!' >>>> s4 = 'hello, world!' >>>> id(s3), id(s4) > (4454721608, 4454721664) >>>> s3 == s4 > True >>>> s3 is s4 > False > > Python memory allocation is varying in all these use cases. Please help me > understand. > > Thanks, > Sunil. G > _______________________________________________ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > https://mail.python.org/mailman/listinfo/tutor > _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
