#1351692: in pprint, always call format() for dict and list items to enable

custom formatting of contents via subclassing PrettyPrinter.

Author: birkenfeld

Lib/pprint.py

@@ -131,65 +131,70 @@ def _format(self, object, stream, indent, allowance, context, level):
         sepLines = _len(rep) > (self._width - 1 - indent - allowance)
         write = stream.write
 
-        if sepLines:
-            r = getattr(typ, "__repr__", None)
-            if issubclass(typ, dict) and r is dict.__repr__:
-                write('{')
-                if self._indent_per_level > 1:
-                    write((self._indent_per_level - 1) * ' ')
-                length = _len(object)
-                if length:
-                    context[objid] = 1
-                    indent = indent + self._indent_per_level
-                    items  = object.items()
-                    items.sort()
-                    key, ent = items[0]
-                    rep = self._repr(key, context, level)
-                    write(rep)
-                    write(': ')
-                    self._format(ent, stream, indent + _len(rep) + 2,
-                                  allowance + 1, context, level)
-                    if length > 1:
-                        for key, ent in items[1:]:
-                            rep = self._repr(key, context, level)
+        r = getattr(typ, "__repr__", None)
+        if issubclass(typ, dict) and r is dict.__repr__:
+            write('{')
+            if self._indent_per_level > 1:
+                write((self._indent_per_level - 1) * ' ')
+            length = _len(object)
+            if length:
+                context[objid] = 1
+                indent = indent + self._indent_per_level
+                items  = object.items()
+                items.sort()
+                key, ent = items[0]
+                rep = self._repr(key, context, level)
+                write(rep)
+                write(': ')
+                self._format(ent, stream, indent + _len(rep) + 2,
+                              allowance + 1, context, level)
+                if length > 1:
+                    for key, ent in items[1:]:
+                        rep = self._repr(key, context, level)
+                        if sepLines:
                             write(',\n%s%s: ' % (' '*indent, rep))
-                            self._format(ent, stream, indent + _len(rep) + 2,
-                                          allowance + 1, context, level)
-                    indent = indent - self._indent_per_level
-                    del context[objid]
-                write('}')
-                return
-
-            if (issubclass(typ, list) and r is list.__repr__) or \
-               (issubclass(typ, tuple) and r is tuple.__repr__):
-                if issubclass(typ, list):
-                    write('[')
-                    endchar = ']'
-                else:
-                    write('(')
-                    endchar = ')'
-                if self._indent_per_level > 1:
-                    write((self._indent_per_level - 1) * ' ')
-                length = _len(object)
-                if length:
-                    context[objid] = 1
-                    indent = indent + self._indent_per_level
-                    self._format(object[0], stream, indent, allowance + 1,
-                                 context, level)
-                    if length > 1:
-                        for ent in object[1:]:
-                            write(',\n' + ' '*indent)
-                            self._format(ent, stream, indent,
-                                          allowance + 1, context, level)
-                    indent = indent - self._indent_per_level
-                    del context[objid]
-                if issubclass(typ, tuple) and length == 1:
-                    write(',')
-                write(endchar)
-                return
+                        else:
+                            write(', %s: ' % rep)
+                        self._format(ent, stream, indent + _len(rep) + 2,
+                                      allowance + 1, context, level)
+                indent = indent - self._indent_per_level
+                del context[objid]
+            write('}')
+            return
 
+        if (issubclass(typ, list) and r is list.__repr__) or \
+           (issubclass(typ, tuple) and r is tuple.__repr__):
+            if issubclass(typ, list):
+                write('[')
+                endchar = ']'
+            else:
+                write('(')
+                endchar = ')'
+            if self._indent_per_level > 1:
+                write((self._indent_per_level - 1) * ' ')
+            length = _len(object)
+            if length:
+                context[objid] = 1
+                indent = indent + self._indent_per_level
+                self._format(object[0], stream, indent, allowance + 1,
+                             context, level)
+                if length > 1:
+                    for ent in object[1:]:
+                        if sepLines:
+                            write(',\n' + ' '*indent)
+                        else:
+                            write(', ')
+                        self._format(ent, stream, indent,
+                                      allowance + 1, context, level)
+                indent = indent - self._indent_per_level
+                del context[objid]
+            if issubclass(typ, tuple) and length == 1:
+                write(',')
+            write(endchar)
+            return
         write(rep)
 
+
     def _repr(self, object, context, level):
         repr, readable, recursive = self.format(object, context.copy(),
                                                 self._depth, level)