add Python 3.3 to testing
fix: Unnecessary backslash in expression
fix: Unbound local variable
fix: Trailing semicolon in the statement
fix: Trying to call a nno-callable object
fix: Default argument value is mutable
fix: Incorrect call arguments
fix: simplify dict creation
fix: Access to properties
supress bogus warnings
fix: Incorrect call arguments
fix: Unused local
fix: Methods having trouble with first parameter
fix: Trying to call a non-callable object