Mark Dickinson added the comment:

For reference, here's the full traceback. Issue #27975 isn't relevant here - 
the problem is an out-of-range integer being passed to the math.pow operation.

taniyama:cpython-git mdickinson$ ./python.exe
Python 3.7.0a0 (default, Sep 13 2016, 08:36:28) 
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import statistics
>>> statistics.geometric_mean(0.7 for _ in range(5000))
Traceback (most recent call last):
  File "/Users/mdickinson/Python/cpython-git/Lib/statistics.py", line 343, in 
float_nroot
    isinfinity = math.isinf(x)
OverflowError: int too large to convert to float

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/mdickinson/Python/cpython-git/Lib/statistics.py", line 578, in 
geometric_mean
    s = 2**p * _nth_root(2**q, n)
  File "/Users/mdickinson/Python/cpython-git/Lib/statistics.py", line 330, in 
nth_root
    return _nroot_NS.float_nroot(x, n)
  File "/Users/mdickinson/Python/cpython-git/Lib/statistics.py", line 345, in 
float_nroot
    return _nroot_NS.bignum_nroot(x, n)
  File "/Users/mdickinson/Python/cpython-git/Lib/statistics.py", line 472, in 
bignum_nroot
    b = 2**q * _nroot_NS.nroot(2**r, n)
  File "/Users/mdickinson/Python/cpython-git/Lib/statistics.py", line 365, in 
nroot
    r1 = math.pow(x, 1.0/n)
OverflowError: int too large to convert to float

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28111>
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