How can I remove any text inside parentheses including the parentheses themselves in Python?

Question

The program must remove all parentheses from the text and everything inside the parentheses. When entering "text)" or "text (text)" everything works fine. But there is an error in case I enter "text(". I'm new to Python and I understand that my code is 100% bulky than it should be. Can you please tell me what's wrong with my code?

print("Программа удаляет из текста все круглые скобки "
      "и всё, что было внутри этих скобок.")


# Создал функцию parentheses_text_remove.
# Она делает всю работу, а в конце мы просто вызываем её.
def parentheses_text_remove(text):
    # Цикл, чтобы находило все скобки в тексте.
    while "(" in text:
        # Переменная start, находит открывающую скобку.
        start = text.index("(")
        """
        Следующая строка кода нужна для удаления пробела перед "(".
        Слайсим весь текст до start, т.е. до "(" и ищем последний
        пробел до start.
        """
        start = text[:start].rfind(" ", 0, start)
        # Переменная end находит закрывающую скобку.
        end = text.index(")", start)
        """
        Объединяем всё, что ДО скобок с тем, что ПОСЛЕ.
        Всё, что внутри скобок, включая сами скобки,
        в новом тексте не участвует.
        """
        text = text[:start] + text[end + 1:]
    return text


# Добавил всё в цикл, чтобы имитировать какое-никакое общение.
while True:
    initial_input = input("Для запуска введите «Старт», "
                          "для выхода введите «Выход»."
                          "\n> ").lower().strip()
    if initial_input == "старт":
        while True:
            # Собственно, ввод и вывод текста.
            user_input = input("Введите текст: ")
            final_output = parentheses_text_remove(user_input)
            if user_input == "":
                print("Вы ничего не ввели. Попробуйте заново "
                      "или введите «Выход» для выхода.")
                continue
            elif user_input in ["выход", "Выход", "ВЫХОД"]:
                print("Выход из программы..."
                      "\n...завершён.")
                exit()
            print("Результат:", final_output)
    elif initial_input == "выход":
        print("Выход из программы..."
              "\n...завершён.")
        quit()
    else:
        print("Некорректный ввод. Попробуйте заново.")
        continue

Error when trying to enter "text(":

Traceback (most recent call last):
  File "D:\PycharmProjects\Python\myfile.py", line 38, in <module>
    final_output = parentheses_text_remove(user_input)
  File "D:\PycharmProjects\Python\myfile.py", line 19, in parentheses_text_remove
    end = text.index(")", start)
ValueError: substring not found

How to make the program ignore "text("?

I tried this:

if ")" not in text[start:]:
            text = text[:start] + "(" + text[start+1:]
            continue

But it doesn't work. In this case, If I enter "text(" the program does nothing. There is no error, I still can enter additional text but when I push Enter button nothing happens.

Why not just make an if statement to check if `)` exists in the string? — SimonUnderwood, May 30 '23 at 15:59
I tried. But since it didn't help, I'm not sure what to put into the statement — Local man, May 30 '23 at 16:00
Can you use `re` --> https://stackoverflow.com/questions/640001/how-can-i-remove-text-within-parentheses-with-a-regex — JonSG, May 30 '23 at 16:14
You can't break out of the while loop with a `continue` statement. — gre_gor, May 30 '23 at 16:14
@SimonUnderwood can you please check my statement for `)` above? — Local man, May 30 '23 at 16:14
@gre_gor why? For example, according to w3schools, I can use `continue` — Local man, May 30 '23 at 16:21
I really doubt even w3schools would tell you to use `continue` to break out of the loop. — gre_gor, May 30 '23 at 16:28
@gre_gor https://www.w3schools.com/python/ref_keyword_continue.asp#:~:text=The%20continue%20keyword%20is%20used%20to%20end%20the%20current%20iteration%20in%20a%20for%20loop%20(or%20a%20while%20loop)%2C%20and%20continues%20to%20the%20next%20iteration. — Local man, Jun 03 '23 at 19:09

Michael Hodel · Answer 1 · 2023-05-30T16:13:00.227

0

def parentheses_text_remove(text):
    # keep removing pairs of '(' and ')' as long as there are any
    while '(' in text and ')' in text:
        for i, character in enumerate(text):
            # step through the characters until you encounter a closing bracket
            if character == ')':
                j = i
                # walk back until you encounter an opening bracket
                while text[j] != '(':
                    j -= 1
                # strip out the part in brackets
                text = text[:j] + text[i+1:]
                break
    return text

print(parentheses_text_remove(
    'Hello (remove this (remove this as well)) World (this needs to go (too))'
))

prints

Hello  World

edited May 30 '23 at 16:13

answered May 30 '23 at 16:06

Michael Hodel

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This doesn't answer the question *"Can you please tell me what's wrong with my code?"* And OP has problem with text with not matching parentheses. – gre_gor May 30 '23 at 16:16
Well, there are comments explaining what the code does. Also, title states "How can I remove any text inside parentheses including the parentheses themselves in Python?", and I provided code that does exactly this. – Michael Hodel May 30 '23 at 16:18
You need to read more than the title. – gre_gor May 30 '23 at 16:18
The code also fails on `")("`. – gre_gor May 30 '23 at 16:34

How can I remove any text inside parentheses including the parentheses themselves in Python?

1 Answers1