backjoon 10866 - deck(Python)

algorithm.py

my_list1=[]
num=int(input())
def function(a,b=1):
    if(a=="push_front"):
        my_list1.insert(0,b)
    elif(a=="push_back"):
        my_list1.insert(my_list1.__len__(),b)
    elif(a=="pop_front"):
        if(my_list1.__len__()!=0):
            print(my_list1[0])
            my_list1.__delitem__(0)
        else:
            print("-1")
    elif(a=="pop_back"):
        if(my_list1.__len__()!=0):
            print(my_list1.pop())
        else:
            print("-1")
    elif(a=="size"):
        print(my_list1.__len__())
    elif(a=="empty"):
        if(my_list1.__len__()==0):

            print("1")
        else:
            print("0")
    elif(a=="front"):
        if(my_list1.__len__()!=0):
            print(my_list1[0])
        else:
            print("-1")
    elif(a=="back"):
        if(my_list1.__len__()!=0):
            print(my_list1[my_list1.__len__()-1])
        else:
            print("-1")

for i in range(num):
    a=input()
    a1,b1="word",1
    if ' 'in a:
        a1,b1=a.split()
        function(a1, b1)
    else:
        function(a)