[PATCH] Implement debug framework.

[fabian...@gmail.com]

From: Fabian Seoane <fab...@fseoane.net>

For now this is just a variable sympy.SYMPY_DEBUG that has values True/False.

Values for this are set using the environment variable SYMPY_DEBUG
---
doc/src/guide.txt | 9 +++++++++
sympy/__init__.py | 3 +++
2 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/doc/src/guide.txt b/doc/src/guide.txt
index 69cf07c..70680dc 100644
--- a/doc/src/guide.txt
+++ b/doc/src/guide.txt
@@ -197,6 +197,15 @@ up::
Out[2]: False


+Debugging
+---------
+
+Starting with 0.6.4, you can turn on/off debugg messages with the environment variable
+SYMPY_DEBUG, which is expected to have the values True or False. For example, o turn on
+debugging, you would issue::
+
+ [user@localhost]: SYMPY_DEBUG=True ./bin/isympy
+
Functionality
-------------

diff --git a/sympy/__init__.py b/sympy/__init__.py
index 29da638..9d083db 100644
--- a/sympy/__init__.py
+++ b/sympy/__init__.py
@@ -37,5 +37,8 @@ from polynomials import factor

evalf._create_evalf_table()

+import os
+SYMPY_DEBUG = eval(os.getenv('SYMPY_DEBUG', 'False'))
+
# This is slow to import:
#import abc
--
1.6.0.2