def evaluate_expression(self):
exp_str = None
# If invalid input, keep prompting for input
while exp_str is None:
exp_str = input(
'\nPlease enter the expression you want to evaluate:\n')
try:
exp_str = exp_str.replace(' ', '')
expression = Expression(exp_str)
expression.parse_tree()
except Exception as e:
exp_str = None
print('Invalid Expression, ' + str(e))
# checking for print order
orderprint_selection = self.__print_order_selection()
if orderprint_selection == "1":
expression.print_preorder()
elif orderprint_selection == "2":
expression.print_inorder()
elif orderprint_selection == "3":
expression.print_postorder()
# writes into a history file
with open('./history.txt', 'a') as history_file:
history_file.write("Expression {} evaluates to: {:.3f}\n".format(
str(expression), expression.val))
with open('./input/input_history.txt', 'a') as history_file:
history_file.write('\n' + str(expression))
# printing
print("\nExpression evaluates to:\n{:.3f}".format(expression.val))
def __parsefile(self, input_file, sort_method, ascending_check,
sort_by_value):
# checks for sorting method and creates object accordingly
if sort_method == "1":
exp_list = SortedList(ascending_check)
elif sort_method == "2":
exp_list = []
for i in range(len(input_file)):
try:
input_file[i].replace(' ', '')
expression = Expression(input_file[i])
expression.parse_tree()
expression.set_sort_value(sort_by_value)
except Exception as e:
print("\nInvalid expression at line " + str(i + 1) +
". Skipping expression")
print(e)
continue
if sort_method == "1":
exp_list.insert(expression)
elif sort_method == "2":
exp_list.append(expression)
if sort_method == "2":
sort_expressions(exp_list, ascending_check)
return exp_list
