Invalid syntax in IDLE how to understand what is wrong?

Question

Python

I'm just starting to learn Python. I'm writing the simplest task in IDLE, but it gives out invalid syntax:


It seems that I'm doing everything right. How to understand what exactly is the error? What's wrong?
The code

profit = 0.23 #задать переменную ежегодной прибыли
total_profit = planned_sales_volume * profit
planned_sales_volume = int(input("Введите плановый объем продаж: ") #задать переменную для ввода новой суммы  объема продаж                          
print(total_profit) #вывести прибыль от объма продаж

Answer 1

The int brackets are not closed.

Answer 2

total_profit should preferably be after planned_sales_volume. You can use another code editor that shows syntax errors. For example: PyCharm, Visual Studio Code

Answer 3

In the first line, it is not known where the variable planned_sales_volume came from ...
In the line , the
planned_sales_volume = int(input("Введите...
bracket is not closed
, too lazy to look further ...