(core) A few tiny documentation tweaks.

Summary:
- Improve readability of documentation of CONTAINS.
- Add leading underscore to Record._get_encodable_row_ids() to hide from
  public docs, and avoid interfering with user fields.
- Fix up lint errors

Test Plan: No behavior changes

Reviewers: paulfitz

Reviewed By: paulfitz

Differential Revision: https://phab.getgrist.com/D3209

sandbox/grist/functions/lookup.py

@@ -154,7 +154,9 @@ def VLOOKUP(table, **field_value_pairs):
 class _Contains(namedtuple("_Contains", "value")):
   """
   Use this marker with [UserTable.lookupRecords](#lookuprecords) to find records
-  where a field of a list type (such as `Choice List` or `Reference List`) contains the given value, e.g:
+  where a field of a list type (such as `Choice List` or `Reference List`) contains the given value.
+
+  For example:
 
       MoviesTable.lookupRecords(genre=CONTAINS("Drama"))
 

sandbox/grist/functions/math.py

@@ -612,6 +612,8 @@ def ROUND(value, places=0):
   2.0
   >>> ROUND(2.5)
   3.0
+  >>> ROUND(-2.5)
+  -3.0
   >>> ROUND(2.15, 1)
   2.2
   >>> ROUND(-1.475, 2)

sandbox/grist/objtypes.py

@@ -190,7 +190,7 @@ def encode_object(value):
     elif isinstance(value, (list, tuple)):
       return ['L'] + [encode_object(item) for item in value]
     elif isinstance(value, records.RecordSet):
-      return ['r', value._table.table_id, value.get_encodable_row_ids()]
+      return ['r', value._table.table_id, value._get_encodable_row_ids()]
     elif isinstance(value, RecordSetStub):
       return ['r', value.table_id, value.row_ids]
     elif isinstance(value, dict):

sandbox/grist/records.py

@@ -133,6 +133,8 @@ class RecordSet(object):
 
   You can get the number of records in a RecordSet using `len`, e.g. `len($group)`.
   """
+  # Methods should be named with a leading underscore to avoid interfering with access to
+  # user-defined fields.
   def __init__(self, table, row_ids, relation=None, group_by=None, sort_by=None):
     """
     group_by may be a dictionary mapping column names to values that are all the same for the given
@@ -194,7 +196,7 @@ class RecordSet(object):
                                  group_by=self._group_by,
                                  sort_by=self._sort_by)
 
-  def get_encodable_row_ids(self):
+  def _get_encodable_row_ids(self):
     """
     Returns stored rowIds as a simple list or tuple type, even if actually stored as RecordList.
     """

sandbox/grist/table.py

@@ -89,9 +89,10 @@ class UserTable(object):
     ```
 
     See [RecordSet](#recordset) for useful properties offered by the returned object.
-    
-    See [CONTAINS](#contains) for an example utilizing `UserTable.lookupRecords` to find records where
-   a field of a list type (such as `Choice List` or `Reference List`) contains the given value.
+
+    See [CONTAINS](#contains) for an example utilizing `UserTable.lookupRecords` to find records
+    where a field of a list type (such as `Choice List` or `Reference List`) contains the given
+    value.
     """
     return self.table.lookup_records(**field_value_pairs)
 
@@ -356,6 +357,7 @@ class Table(object):
     col_id = summary_table._summary_helper_col_id
     if self.has_column(col_id):
       # If type changed between Reference/ReferenceList, replace completely.
+      # pylint: disable=unidiomatic-typecheck
       if type(self.get_column(col_id).type_obj) != type(_updateSummary.grist_type):
         self.delete_column(self.get_column(col_id))
     col_obj = self._create_or_update_col(col_id, _updateSummary)