Learning Python, using an online compiler to check for something, it throws an exception when assigning a list

I am using three lists to format something. However, when assigning values to the lists, I get this exception:

  File "main.py", line 1
    first-operand-list = ['', '  ', '3801', '    ', '  ', '123'];
    ^
SyntaxError: cannot assign to operator

Could anyone explain why? Here is the code:

first-operand-list = ['', '  ', '3801', '    ', '  ', '123'];
second-operator-list = ['', '-    ', '2', '    ', '+  ', '49'];
line-list = ['------', '    ', '-----', '    '];

def to_result():
    row_one = "".join(first_operand_list);
    row_two = "".join(second_operand_list);
    row_three = "".join(line_list);
    math = row_one + '\n' + row_two + '\n' + row_three;
    return math;
    
print(to_result());

Thank you.

>Solution :

Python doesn’t allow - in variable names. Use _ instead in first-operand-list and second-operator-list