On 21-08-11 19:03, Laurent wrote:
Well I agree with you about string concatenation, but here I'm talking about
integers incrementation...
Seems the two forms are not 100% identical:
>>> import dis
>>> def f1(x):
... x=x+1
...
>>> def f2(x):
... x+=1
...
>>>
>>> dis.dis(f1)
2 0 LOAD_FAST 0 (x)
3 LOAD_CONST 1 (1)
6 BINARY_ADD
7 STORE_FAST 0 (x)
10 LOAD_CONST 0 (None)
13 RETURN_VALUE
>>> dis.dis(f2)
2 0 LOAD_FAST 0 (x)
3 LOAD_CONST 1 (1)
6 INPLACE_ADD
7 STORE_FAST 0 (x)
10 LOAD_CONST 0 (None)
13 RETURN_VALUE
>>>
What the precise difference (semantics and speed) is between the
BINARY_ADD and INPLACE_ADD opcodes, I dunno. Look in the Python source
code or maybe someone knows it from memory :-)
Irmen
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