REPL uproot error

>>> import uproot
>>> import ROOT
>>> filename = "tmp.root"
>>> with uproot.recreate(filename) as f:
...     f["hello"] = "world"
...
>>> f = ROOT.TFile.Open(filename)
>>> f.Get("hello")
<cppyy.gbl.TObjString object at 0x55a162ff6750>
>>> assert f.Get("hello") == "world"
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AssertionError