From 726f8e36cf5c869b1a73c583840dc5bb85afd12d Mon Sep 17 00:00:00 2001
From: Gabriel Studer <gabriel.studer@stud.unibas.ch>
Date: Mon, 22 Apr 2013 13:46:38 +0200
Subject: [PATCH] modified documentation
---
modules/base/pymod/table.py | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/modules/base/pymod/table.py b/modules/base/pymod/table.py
index 39a8f40df..207c5ab29 100644
--- a/modules/base/pymod/table.py
+++ b/modules/base/pymod/table.py
@@ -830,15 +830,15 @@ Statistics for column %(col)s
Operands have to be the name of a column or an expression that can be parsed to
float, int, bool or string.
- Valid operators are: and, or, !=, <=, >=, =, <, >, +, -, *, /
+ Valid operators are: and, or, !=, !, <=, >=, ==, =, <, >, +, -, *, /
.. code-block:: python
subtab=tab.Select('col_a>0.5 and (col_b=5 or col_c=5)')
The selection query should be self explaining. Allowed parenthesis are: (), [], {},
- whereas parenthesis mismatches get recognized. If there is a row containing 'None'
- in a query relevant column, it will be neglected.
+ whereas parenthesis mismatches get recognized. Expressions like '3<=col_a>=col_b'
+ throw an error, due to problems in figuring out the evaluation order.
There are two special expressions:
@@ -850,8 +850,8 @@ Statistics for column %(col)s
#selects rows, where col_a=1 or col_a=2 or col_a=3
subtab=tab.Select('col_a=1,2,3')
- Be aware, that there is no typechecking! Non consistent combinations of types
- can lead to weird behaviour!
+ Only consistent types can be compared. If col_a is of type string and ccol_b is of type int,
+ following expression would throw an error: 'col_a<ccol_b'
"""
--
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