Python: Compute the depth of groups of matched nested parentheses separated by parentheses

Last update on May 28 2022 13:41:39 (UTC/GMT +8 hours)

Python Programming Puzzles: Exercise-98 with Solution

Given a string consisting of groups of matched nested parentheses separated by parentheses, write a Python program to compute the depth of each group.

Input: (()) (()) () ((()()())) 

Output:
[2, 2, 1, 3]
Input: () (()) () () () ()

Output:
[1, 2, 1, 1, 1, 1]
Input: (((((((()))))))) () (()) ((()()()))

Output:
[8, 1, 2, 3]

Pictorial Presentation:

Python: Compute the depth of groups of matched nested parentheses separated by parentheses.

Sample Solution:

Python Code:

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

def test(parens):
    return [len(s.split(')')[0]) for s in parens.split()]

parentheses  = '(()) (()) () ((()()())) '
print("Parentheses strings:",parentheses )
print("\nDepth of groups of matched nested parentheses separated by parentheses:")
print(test(parentheses))
parentheses  = '() (()) () () () ()'
print("Parentheses strings:",parentheses )
print("\nDepth of groups of matched nested parentheses separated by parentheses:")
print(test(parentheses))
parentheses  = '(((((((()))))))) () (()) ((()()()))'
print("Parentheses strings:",parentheses )
print("\nDepth of groups of matched nested parentheses separated by parentheses:")
print(test(parentheses))

Sample Output:

Parentheses strings: (()) (()) () ((()()())) 

Depth of groups of matched nested parentheses separated by parentheses:
[2, 2, 1, 3]
Parentheses strings: () (()) () () () ()

Depth of groups of matched nested parentheses separated by parentheses:
[1, 2, 1, 1, 1, 1]
Parentheses strings: (((((((()))))))) () (()) ((()()()))

Depth of groups of matched nested parentheses separated by parentheses:
[8, 1, 2, 3]

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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