Parentheses Checking by python use a suitable class to write a function, given that the input...

Parentheses Checking by python

use a suitable class to write a function, given that the input is the string of parentheses, check if they have the matching open and close brackets

Expert Solution

Code:

def checkParentheses(input_string): #checkParentheses function which accepts input_string

open_par_list = ["(","[","{"]

close_par_list = [")","]","}"]

stack = [] #declare stack list which holds the open parentheses values

for i in input_string: #for each character in given input_string

if i in open_par_list: #if the input_character is '('

stack.append(i) #append it to stack

elif i in close_par_list: #if the input_character is ')'

index = close_par_list.index(i)

if ((len(stack) > 0) and (stack[len(stack)-1])==open_par_list[index]):

#check if the len(stack)>0 and last value in stack is equal to '(' or not

stack.pop()

else: #in other case return unbalanced

return "Unbalanced"

if len(stack) == 0: #if stack length is 0 that means the input is balanced

return "Balanced" #so return balanaced

input_expression=input("Enter the test parentheses string: ") #asking user to enter the input parentheses

print ("The given input" + input_expression + " is "+ checkParentheses(input_expression)) #call checkParentheses() function

Code and Output Screenshots:

Note: if you have any queries please post a comment thanks a lot..always available to help you..

venereology answered 7 months ago

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