Raise ProgrammingError for nan and inf (#314)

* Raise ProgrammingError when inf or nan is passed
  Fixes #246
* Rename _mysql_exceptions -> _exceptions

MySQLdb/_exceptions.py

@@ -1,15 +1,10 @@
-"""_mysql_exceptions: Exception classes for _mysql and MySQLdb.
+"""Exception classes for _mysql and MySQLdb.
 
 These classes are dictated by the DB API v2.0:
 
     https://www.python.org/dev/peps/pep-0249/
 """
-
-try:
-    from exceptions import Exception, StandardError, Warning
-except ImportError:
-    # Python 3
-    StandardError = Exception
+from .compat import StandardError
 
 
 class MySQLError(StandardError):
@@ -20,6 +15,7 @@ class Warning(Warning, MySQLError):
     """Exception raised for important warnings like data truncations
     while inserting, etc."""
 
+
 class Error(MySQLError):
     """Exception that is the base class of all other error exceptions
     (not Warning)."""

MySQLdb/_mysql.c

@@ -2669,7 +2669,7 @@ init_mysql(void)
                    (PyObject *)&_mysql_ResultObject_Type))
         goto error;
     Py_INCREF(&_mysql_ResultObject_Type);
-    if (!(emod = PyImport_ImportModule("MySQLdb._mysql_exceptions"))) {
+    if (!(emod = PyImport_ImportModule("MySQLdb._exceptions"))) {
         PyErr_Print();
         goto error;
     }

MySQLdb/compat.py

@@ -5,8 +5,10 @@ if sys.version_info[0] == 2:
     unicode = unicode
     unichr = unichr
     long = long
+    StandardError = StandardError
 else:
     PY2 = False
     unicode = str
     unichr = chr
     long = int
+    StandardError = Exception

MySQLdb/connections.py

@@ -9,7 +9,7 @@ import sys
 
 from MySQLdb import cursors, _mysql
 from MySQLdb.compat import unicode, PY2
-from MySQLdb._mysql_exceptions import (
+from MySQLdb._exceptions import (
     Warning, Error, InterfaceError, DataError,
     DatabaseError, OperationalError, IntegrityError, InternalError,
     NotSupportedError, ProgrammingError,

MySQLdb/converters.py

@@ -36,6 +36,7 @@ from MySQLdb._mysql import string_literal, escape
 from MySQLdb.constants import FIELD_TYPE, FLAG
 from MySQLdb.times import *
 from MySQLdb.compat import PY2, long, unicode
+from MySQLdb._exceptions import ProgrammingError
 
 NoneType = type(None)
 
@@ -66,6 +67,8 @@ def Unicode2Str(s, d):
 
 def Float2Str(o, d):
     s = repr(o)
+    if s in ('inf', 'nan'):
+        raise ProgrammingError("%s can not be used with MySQL" % s)
     if 'e' not in s:
         s += 'e0'
     return s

MySQLdb/cursors.py

@@ -9,7 +9,7 @@ import re
 import sys
 
 from .compat import unicode
-from ._mysql_exceptions import (
+from ._exceptions import (
     Warning, Error, InterfaceError, DataError,
     DatabaseError, OperationalError, IntegrityError, InternalError,
     NotSupportedError, ProgrammingError)
@@ -48,7 +48,7 @@ class BaseCursor(object):
     #: Default value of max_allowed_packet is 1048576.
     max_stmt_length = 64*1024
 
-    from ._mysql_exceptions import (
+    from ._exceptions import (
         MySQLError, Warning, Error, InterfaceError,
         DatabaseError, DataError, OperationalError, IntegrityError,
         InternalError, ProgrammingError, NotSupportedError,