The question is not about how to concatenate list and tuple but about behaviour of the operator +=. Let's assume we have a tuple t = (3, ) If we siply execute following expression it fails with TypeError: can only concatenate list (not "tuple") to list [1, 2] + t Obviously this can be fixed with explicit type cast [1, 2] + list(t) Similarly, if we try below we get TypeError x2 = [1, 2] x2 = x2 + t x2 The question is why following works fine? x1 = [1, 2] x1 += t x1 I presume it does implicit conversion but appreciate more substantial eplanation and links to official documentation. Thanks Continue reading...
