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BUG: fix dirint KeyError with scalar inputs on pandas >= 2.0 #2752

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BUG: fix dirint KeyError with scalar inputs on pandas >= 2.0 #2752

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b8f2634
BUG: fix dirint KeyError with scalar inputs on pandas >= 2.0
Omesh37 May 8, 2026
33f8c49
TST,CHANGELOG: add test and whatsnew entry for dirint scalar fix GH#2751
Omesh37 May 8, 2026
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3 changes: 3 additions & 0 deletions docs/sphinx/source/whatsnew/v0.15.2.rst
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Expand Up @@ -14,6 +14,9 @@ Deprecations

Bug fixes
~~~~~~~~~
* Fixed :py:func:`pvlib.irradiance.dirint` raising ``KeyError`` with
scalar inputs on pandas >= 2.0. (:pull:`XXXX`, :issue:`2751`)
By :ghuser:`Omesh37`.
* Corrects a bug in :py:func:`pvlib.temperature.fuentes`. If inputs were
data type integer, users can expect modeled cell temperature values to
increase slightly.
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8 changes: 8 additions & 0 deletions pvlib/irradiance.py
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Expand Up @@ -2109,6 +2109,14 @@ def _dirint_bins(times, kt_prime, zenith, w, delta_kt_prime):
-------
tuple of kt_prime_bin, zenith_bin, w_bin, delta_kt_prime_bin
"""
# Ensure scalar inputs are converted to Series so that boolean masks
# produce a boolean Series rather than a scalar bool.
# Scalar bools cause KeyError in pandas >= 2.0. GH #XXXX
kt_prime = pd.Series(kt_prime, index=times, dtype=float)
zenith = pd.Series(zenith, index=times, dtype=float)
w = pd.Series(w, index=times, dtype=float)
delta_kt_prime = pd.Series(delta_kt_prime, index=times, dtype=float)

# @wholmgren: the following bin assignments use MATLAB's 1-indexing.
# Later, we'll subtract 1 to conform to Python's 0-indexing.

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