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2 changes: 1 addition & 1 deletion pandas/io/json/_json.py
Original file line number Diff line number Diff line change
Expand Up @@ -175,7 +175,7 @@ def to_json(

if mode == "a" and (not lines or orient != "records"):
msg = (
"mode='a' (append) is only supported when"
"mode='a' (append) is only supported when "
"lines is True and orient is 'records'"
)
raise ValueError(msg)
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4 changes: 2 additions & 2 deletions pandas/tests/io/json/test_readlines.py
Original file line number Diff line number Diff line change
Expand Up @@ -399,7 +399,7 @@ def test_to_json_append_orient(orient_):
# Test ValueError when orient is not 'records'
df = DataFrame({"col1": [1, 2], "col2": ["a", "b"]})
msg = (
r"mode='a' \(append\) is only supported when"
r"mode='a' \(append\) is only supported when "
"lines is True and orient is 'records'"
)
with pytest.raises(ValueError, match=msg):
Expand All @@ -411,7 +411,7 @@ def test_to_json_append_lines():
# Test ValueError when lines is not True
df = DataFrame({"col1": [1, 2], "col2": ["a", "b"]})
msg = (
r"mode='a' \(append\) is only supported when"
r"mode='a' \(append\) is only supported when "
"lines is True and orient is 'records'"
)
with pytest.raises(ValueError, match=msg):
Expand Down