Unable to parse a boolean expression with "~E"

[lwerdna]

There's something about "not E" or "~E" that the parser doesn't like. Notice other letters and "E" alone are fine:

>>> import sympy
>>> sympy.parsing.sympy_parser.parse_expr('A')
A
>>> sympy.parsing.sympy_parser.parse_expr('E')
E
>>> sympy.parsing.sympy_parser.parse_expr('~E')
Traceback (most recent call last):
...
TypeError: bad operand type for unary ~: 'Exp1'

[lwerdna]

I found that parsing "I" raises TypeError: bad operand type for unary ~: 'ImaginaryUnit' so then I looked into the local_dict and global_dict keyword arguments. I thought that since they were by default None, it meant no variable lookup during parsing. I didn't realize it means it won't override the default variables. My mistake, sorry if this was any inconvenience.