adding custom abc and multiple titles #294

Author: pratiman-91

proplot/axes/base.py

@@ -298,7 +298,7 @@
 _axes_format_docstring = """
 title : str, optional
     The axes title.
-abc : bool or str, default: :rc:`abc`
+abc : bool or str or tuple, default: :rc:`abc`
     The "a-b-c" subplot label style. Must contain the character ``a`` or ``A``,
     for example ``'a.'``, or ``'A'``. If ``True`` then the default style of
     ``'a'`` is used. The ``a`` or ``A`` is replaced with the alphabetic character
@@ -345,10 +345,10 @@
     The horizontal padding between a-b-c labels and titles in the same location.
     %(units.pt)s
 ltitle, ctitle, rtitle, ultitle, uctitle, urtitle, lltitle, lctitle, lrtitle \
-: str, optional
+: str, tuple, optional
     Shorthands for the below keywords.
 lefttitle, centertitle, righttitle, upperlefttitle, uppercentertitle, upperrighttitle, \
-lowerlefttitle, lowercentertitle, lowerrighttitle : str, optional
+lowerlefttitle, lowercentertitle, lowerrighttitle : str, tuple, optional
     Additional titles in specific positions. This works as an alternative
     to the ``ax.format(title='Title', titleloc=loc)`` workflow and permits
     adding more than one title-like label for a single axes.
@@ -2450,9 +2450,11 @@ def _update_abc(self, **kwargs):
         abc = rc.find('abc', context=True)  # 1st run, or changed
         if abc is True:
             abc = 'a'
-        if abc and (not isinstance(abc, str) or 'a' not in abc and 'A' not in abc):
-            raise ValueError(f'Invalid style {abc!r}. Must include letter "a" or "A".')
-        if abc and self.number is not None:
+        if isinstance(abc, tuple):
+            kw['text'] = abc[self.number - 1]
+        elif abc and (not isinstance(abc, str) or 'a' not in abc and 'A' not in abc):
+            raise ValueError(f'Invalid style {abc!r}. Must include letter "a" or "A"')
+        if isinstance(abc, str) and self.number is not None:
             nabc, iabc = divmod(self.number - 1, 26)
             old = re.search('[aA]', abc).group()  # return the *first* 'a' or 'A'
             new = (nabc + 1) * ABC_STRING[iabc]
@@ -2531,7 +2533,9 @@ def _update_title(self, loc, title=None, **kwargs):
         # necesssary. For inner panels, use the border and bbox settings.
         if loc not in ('left', 'right', 'center'):
             kw.update(self._title_border_kwargs)
-        if title is not None:
+        if isinstance(title, tuple):
+            kw['text'] = title[self.number - 1]
+        elif title is not None:
             kw['text'] = title
         kw.update(kwargs)
         self._title_dict[loc].update(kw)

proplot/internals/rcsetup.py

@@ -181,12 +181,15 @@ def _validate_abc(value):
     Validate a-b-c setting.
     """
     try:
-        return _validate_bool(value)
+        if type(value) is not tuple:
+            return _validate_bool(value)
     except ValueError:
         pass
     if isinstance(value, str) and 'a' in value.lower():
         return value
-    raise ValueError("A-b-c specification must be string containing 'a' or 'A'.")
+    if isinstance(value, tuple):
+        return value
+    raise ValueError("A-b-c specification must be string containing 'a' or 'A'")
 
 
 def _validate_belongs(*options):