Apply suggestions from code review

Co-authored-by: Adam R. Jensen <39184289+AdamRJensen@users.noreply.github.com>

Author: jesuspolo

pvlib/spectrum/mismatch.py

@@ -711,30 +711,25 @@ def spectral_factor_jrc(airmass, clearsky_index, module_type=None,
     )
     return mismatch
 
-def spectral_factor_polo(precipitable_water, airmass_absolute, aod500, aoi, altitude,
-                              module_type=None, coefficients=None, albedo=0.2):
+
+def spectral_factor_polo(precipitable_water, airmass_absolute, aod500, aoi,
+                         altitude, module_type=None, coefficients=None,
+                         albedo=0.2):
     """
     Estimation of spectral mismatch for BIPV application in vertical facades.
-    
-   
-
     Parameters
     ----------
     precipitable_water : numeric
         atmospheric precipitable water. [cm]
 
     airmass_absolute : numeric
         absolute (pressure-adjusted) airmass. [unitless]
-
     aod500 : numeric
         atmospheric aerosol optical depth at 500 nm. [unitless]
-    
     aoi : numeric
         angle of incidence. [degrees]
-    
     altitude: numeric
-        altitude over sea level. [m]    
-        
+        altitude over sea level. [m]
     module_type : str, optional
         One of the following PV technology strings from [1]_:
 
@@ -743,11 +738,11 @@ def spectral_factor_polo(precipitable_water, airmass_absolute, aod500, aoi, alti
         * ``'cigs'`` - anonymous copper indium gallium selenide module.
         * ``'asi'`` - anonymous amorphous silicon module.
     albedo
-        Ground albedo (default value if 0.2). [unitless]    
+        Ground albedo (default value if 0.2). [unitless]
 
     coefficients : array-like, optional
         user-defined coefficients, if not using one of the default coefficient
-        sets via the ``module_type`` parameter.
+        set via the ``module_type`` parameter.
 
     Returns
     -------
@@ -761,7 +756,7 @@ def spectral_factor_polo(precipitable_water, airmass_absolute, aod500, aoi, alti
     ----------
     [1]. Polo, J., Sanz-saiz, C., Development of spectral mismatch models
     for BIPV applications in building façades Abbreviations : Renew. Energy 245, 122820, 2025.
-    https://doi.org/10.1016/j.renene.2025.122820
+    :doi:`10.1016/j.renene.2025.122820`
     
     """
     if module_type is None and coefficients is None:
@@ -776,36 +771,33 @@ def spectral_factor_polo(precipitable_water, airmass_absolute, aod500, aoi, alti
     Ram=am90/airmass_absolute
 
     _coefficients={}
-    _coefficients['cdte']=(
-        -0.0009,46.80,49.20,-0.87, 0.00041,0.053 )
-    _coefficients['monosi']=(
-        0.0027,10.34,9.48,0.307,0.00077,0.006 )
-    _coefficients['cigs']=(
-        0.0017,2.33,1.30,0.11,0.00098,-0.0177 )
-    _coefficients['asi']=(
-        0.0024,7.32,7.09,-0.72,-0.0013,0.089 )
-    
-    c={}
-    c['asi']=(0.0056,-0.020,1.014)
-    c['cigs']=(-0.0009,-0.0003,1)
-    c['cdte']=(0.0021,-0.01,1.01)
-    c['monosi']=(0,-0.003,1.0)
+    _coefficients = {
+        'cdte': (-0.0009, 46.80, 49.20, -0.87, 0.00041, 0.053),
+        'monosi': (0.0027, 10.34, 9.48, 0.307, 0.00077, 0.006),
+        'cigs': (0.0017, 2.33, 1.30, 0.11, 0.00098, -0.0177),
+        'asi': (0.0024, 7.32, 7.09, -0.72, -0.0013, 0.089),
+    }
 
+    c = {
+        'asi': (0.0056, -0.020, 1.014),
+        'cigs': (-0.0009, -0.0003, 1),
+        'cdte': (0.0021, -0.01, 1.01),
+        'monosi': (0, -0.003, 1.0),
+    }
 
     if module_type is not None:
         coeff = _coefficients[module_type]
-        c_albedo=c[module_type]
+        c_albedo = c[module_type]
     else:
         coeff = coefficients
-        c_albedo=(0.0,0.0,1.0) # 0.2 albedo assumed
-        albedo=0.2
-    
+        c_albedo = (0.0, 0.0, 1.0)  # 0.2 albedo assumed
+        albedo = 0.2
 
-    smm=coeff[0]*Ram+coeff[1]/(coeff[2]+Ram**coeff[3])+coeff[4]/aod500+coeff[5]*np.sqrt(precipitable_water)
+    smm = coeff[0] * Ram + coeff[1] / (coeff[2] + Ram**coeff[3]) \
+        + coeff[4] / aod500 + coeff[5]*np.sqrt(precipitable_water)
+
     # Ground albedo correction
-      
-    g=c_albedo[0]*(albedo/0.2)**2+c_albedo[1]*(albedo/0.2)+c_albedo[2]
-    
-        
+    g = c_albedo[0] * (albedo/0.2)**2 \
+        + c_albedo[1] * (albedo/0.2) + c_albedo[2]
+
     return g*smm
-