from expression import Expression, Context
ctx = Context()
expr_in = 0
while expr_in != 'exit':
expr_in = input()
if expr_in == 'exit':
break
eq_pos = expr_in.find('=')
if eq_pos == -1:
expr = Expression(expr_in, ctx)
if str(expr) != 'error':
print(expr)
else:
func = expr_in[0:eq_pos - 1]
name = func[:-3]
symbol = func[-2]
ctx.add_func(name, expr_in[eq_pos + 2:], symbol)
# remember our new symbol
# then try to plot it:
# Expression:
# try to parse it in f_parser
# create new Expression
# simplify
# plot
