Please some help! what's wrong on my code? It works on my IDLE but Sololearn doesn't accept it to go on.

Question

here is my code, the out-puts are correct I can understand for three days now.

def balanced(expression):
a =[]
for n in expression:
if n =="(":
a.insert(0,1)

for n in expression:
if n ==")":
if a!=[]:
a.pop()
else:
return "False"
print(a)

if a== []:
return "True"
else:
return"False"

print(balanced(input()))

Answer 1

Do you mean test cases failing?
if yes the check for input ))(( ? it accepts but should reject..

Answer 2

def balanced(expression):
stack = []
for char in expression:
if char == '(':
stack.append(char)
elif char == ')':
if not stack or stack.pop() != '(':
return False
return not stack

print(balanced(input()))