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This article focuses on "how to use Python stack data structures to deal with parenthesis balancing". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn how to use Python stack data structures to deal with parenthesis balancing.

I. Overview

First of all, a brief introduction to what is a Stack?

Stack data structures can be said to be one of several relatively simple data structures, adding or removing elements in a specific order.

Stack data structures have one feature: LIFO, which is often called last-in, first-out.

This feature is like putting bricks in the box, first on the bottom and then on top. When we want to take out the brick, we will take out the top brick and finally the brick that is put into the box.

The act of putting bricks and taking bricks has two corresponding terms in the stack, namely, push and pop.

Second, balance parentheses

Next, let's talk about a common problem in learning stack data structures, balancing parentheses.

What are balance parentheses? When you give a formula, each left parenthesis can find a right parenthesis, two pairs, until there is no remaining, it can be said that the parenthesis is balanced. If you encounter the closing parenthesis first, but there is no left parenthesis to match it, then the formula is not parenthetical balance.

Generally, stack data structures are implemented in Python, and lists are often used.

Ideas for solving the problem:

(1) to implement the stack structure, first create a list to load the data.

(2) the formula to be judged is traversed.

(3) if traversing to the left parenthesis, then use the insert method to add it from the first bit; if it is the right parenthesis, proceed to the next step.

(4) if the list is empty, return a False; directly. If it is not empty, use the pop method to remove one from the first position.

(5) after the loop traversal is over, a further judgment is made. Returns True; if the list is empty. Otherwise, returns False.

Detailed code: def balanced (expression):

Items = []

For i in expression:

If I = "(":

Items.insert (0, I)

Elif I = ")":

If items = = []:

Return False

Else:

Items.pop (0)

Else:

Continue

If items = = []:

Return True

Else:

Return False

Print (balanced (input () at this point, I believe you have a better understanding of "how to use Python stack data structures to deal with parenthesis balancing". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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