How to complete python course 4th project? (Python, Data Structures)

Question

def balanced(expression):
#your code goes here
list=[]
for i in expression :
if i=="(":
list.insert(0,i)
elif i==")":
list.pop(0)
if list==[]:
return True
else:
return False

print(balanced(input()))

https://code.sololearn.com/cEV3TnRxdBbl/?ref=app

Answer 1

You can use a list for that.
If ( in expression, insert it at 0, if ) in expression, remove last element
If the list is empty at the end, return True, else return False. Make sure to catch cases of empty lists

Answer 2

Try to avoid giving variables the same name as built-in functions have. Consider the case of empty lists before trying to remove an element

Answer 3

I tested your code. It gives error for example for the inputs

)
or
)(

Answer 4

Yes i got your point

Answer 5

Thank you Rafal

Answer 6

def balanced(expression):

list = []
abre = 0
fecha = 0

for i in expression :
if i == '(':
abre += 1
if i == ')' :
fecha += 1

if abre >= fecha:

for i in expression :
if i == '(':
list.insert(0,1)
if i == ')' :
if list != []:
list.pop(0)

if abre < fecha:

for i in expression :
if i == ')':
list.insert(0,1)
if i == '(' :
if list != []:
list.pop(0)

if list ==[] :
return True
else:
return False

print(balanced(input()))