How to loop over a TList / histograms in a THStack

loopingTHStack.py

"""Iterate over hists in a THStack.

Turns out it's way easier than in C++
"""

for hist in my_stack.GetHists():
    print type(hist)
    print hist.Integral()

loopingTList.C

/**
 * Snippet taken from code - goes through each hist in a THStack and prints Integral of that hist. 
 * But also handy as a reminder of how to loop through a TList.
 * Important notes:
 * - I have no idea what is going on. Think it auto gets the object somehow when you call next().
 * - next() seems to return the object itself, via a TObject pointer, so you need to cast back to whatever it was. Hope you know!
 * 
*/
 
void checkStackNorm(THStack * st) {
	TList * histKeys = st->GetHists();
	histKeys->Print();
	TIter next(histKeys);
	TObject* object = 0;

	while ((object = next()))
	{
		cout << "Got an object" << endl;
		cout << ((TH1*)object)->Integral() << endl;
	}

 }