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Python: Separate parentheses groups

Python Programming Puzzles: Exercise-94 with Solution

Given a string consisting of whitespace and groups of matched parentheses, write a Python program to split it into groups of perfectly matched parentheses without any whitespace.

Input: 
( ()) ((()()())) (()) ()
Output:
['(())', '((()()()))', '(())', '()']

Input:
() (( ( )() (   )) ) ( ())
Output:
['()', '((()()()))', '(())']

Sample Solution:

Python Code:

#License: https://bit.ly/3oLErEI

def test(combined):
    ls = []
    s2 = ""
    for s in combined.replace(' ', ''):
        s2 += s
        if s2.count("(") == s2.count(")"):
            ls.append(s2)
            s2 = ""
    return ls 
combined = '( ()) ((()()())) (()) ()'
print("Parentheses string:")
print(combined)
print("Separate parentheses groups of the said string:")
print(test(combined))
combined = '() (( ( )() (   )) ) ( ())'
print("\nParentheses string:")
print(combined)
print("Separate parentheses groups of the said string:")
print(test(combined))

Sample Output:

Parentheses string:
( ()) ((()()())) (()) ()
Separate parentheses groups of the said string:
['(())', '((()()()))', '(())', '()']

Parentheses string:
() (( ( )() (   )) ) ( ())
Separate parentheses groups of the said string:
['()', '((()()()))', '(())']

Flowchart:

Flowchart: Python - Separate parentheses groups.

Visualize Python code execution:

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Python Code Editor :

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m