[Python-Dev] PEP 203 Augmented Assignment

Skip Montanaro skip@mojam.com (Skip Montanaro)
Thu, 27 Jul 2000 11:03:29 -0500 (CDT) 

 
    >> Another important reason is that in cases like
    >> 
    >> a[long_and_expensive_call()] = a[long_and_expensive_call()] + 1

    M-A> Dito for this one:

    M-A> i = long_and_expensive_call()
    M-A> a[i] = a[i] + 1

Only if you know that long_and_expensive_call() has no side effects!

Skip