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_to_string: Fix the bug when a 2-D sequence is passed #4032

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Jul 31, 2025
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_to_string: Fix the bug when a 2-D sequence is passed #4032

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5 changes: 4 additions & 1 deletion pygmt/alias.py
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Original file line number Diff line number Diff line change
Expand Up @@ -106,6 +106,9 @@ def _to_string(

>>> _to_string(["xaf", "yaf", "WSen"])
['xaf', 'yaf', 'WSen']

>>> _to_string([[1, 2], [3, 4]], separator="/", ndim=2)
['1/2', '3/4']
"""
# None and False are converted to None.
if value is None or value is False:
Expand All @@ -132,7 +135,7 @@ def _to_string(
# Join the sequence of values with the separator.
# "prefix" and "mapping" are ignored. We can enable them when needed.
_value = sequence_join(value, separator=separator, size=size, ndim=ndim, name=name)
return f"{prefix}{_value}"
return _value if is_nonstr_iter(_value) else f"{prefix}{_value}"


class Alias:
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