How to Convert String Input into a Nested Tuple in Python?

To convert a string input into a nested tuple in Python, you can use recursive parsing techniques. Here’s an example of how you can achieve this:

def parse_string_to_tuple(string):
    if string[0] != '(' or string[-1] != ')':
        raise ValueError("Invalid string format")

    string = string[1:-1]  # Remove outer parentheses

    elements = []
    current_element = ''
    nested_tuple_level = 0

    for char in string:
        if char == '(':
            nested_tuple_level += 1
        elif char == ')':
            nested_tuple_level -= 1

        if char == ',' and nested_tuple_level == 0:
            elements.append(parse_string_to_tuple(current_element.strip()))
            current_element = ''
        else:
            current_element += char

    if current_element:
        elements.append(parse_string_to_tuple(current_element.strip()))

    return tuple(elements)


# Example usage
string_input = "((1, 2), (3, (4, 5)), (6,))"
nested_tuple = parse_string_to_tuple(string_input)
print(nested_tuple)

In this example, the parse_string_to_tuple function recursively parses the string input. It removes the outer parentheses and iterates over the characters of the remaining string. It keeps track of the nesting level using the nested_tuple_level variable. When a comma is encountered at the top-level of nesting (nested_tuple_level is 0), it splits the current element and recursively calls parse_string_to_tuple on each part.

The function continues this process until all elements have been processed, and then it returns the resulting tuple.

In the example usage, the string_input variable is set to the string you want to convert to a nested tuple. The parse_string_to_tuple function is called with the string input, and the resulting nested tuple is printed.

Note that this implementation assumes a well-formed string input with matching parentheses and commas separating elements. You may need to add additional error handling or modify the implementation depending on your specific requirements.