How to call Form in python

This snippet:

for ind in range(0, N):
    key = ROOT.TString("key_") + ROOT.Form("%u", ind)

gives an error:

TypeError: char* ::Form(const char* fmt) =>
    takes at most 1 arguments (2 given)

How to fix?

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ROOT Version: Not Provided
Platform: Not Provided
Compiler: Not Provided

it looks like PyROOT is not binding to the variadic overload of Form correctly, but there is an easy workaround:

//python 3
key = ROOT.TString(f"{ind}")
//python 2
key = ROOT.TString("{}".format(ind))


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