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TST: Added test that checks if df.sum() results in concatenation instead of dtype coercion to float64 or int64 #63260

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TST: Added test that checks if df.sum() results in concatenation instead of dtype coercion to float64 or int64 #63260

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19 changes: 19 additions & 0 deletions pandas/tests/frame/test_reductions.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1043,6 +1043,25 @@ def test_sum_bools(self):
bools = isna(df)
assert bools.sum(axis=1)[0] == 10

def test_sum_string_dtype_coercion(self):
# GH#22642
# Check that summing numeric strings results in concatenation
# and not conversion to dtype int64 or float64
df = DataFrame({"a": ["483", "3"], "b": ["94", "759"]})
result = df.sum(axis=1)
expected = Series(["48394", "3759"])
tm.assert_series_equal(result, expected)

df = DataFrame({"a": ["483.948", "3.0"], "b": ["94.2", "759.93"]})
result = df.sum(axis=1)
expected = Series(["483.94894.2", "3.0759.93"])
tm.assert_series_equal(result, expected)

df = DataFrame({"a": ["483", "3.0"], "b": ["94.2", "79"]})
result = df.sum(axis=1)
expected = Series(["48394.2", "3.079"])
tm.assert_series_equal(result, expected)

# ----------------------------------------------------------------------
# Index of max / min

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