python字符串反转方法

Given a string and we have to reverse it by using stack and by using reversed method in python.

给定一个字符串，我们必须使用堆栈和python中的反转方法来反转它。

1)通过使用堆栈反转字符串 (1) Reverse a string by using stack)

Procedure:

程序：

1. First create an empty stack

   首先创建一个空栈

2. Push each character one by one in stack

   将每个字符一一推送

3. Pop each character one by one and put them back to the string

   逐个弹出每个字符，然后将其放回字符串

2)使用reversed()方法反转串 (2) Reverse a strung using reversed() method)

In this method, we will use reversed() method and iterate over the reversed iterator to get the reversed string.

在此方法中，我们将使用reversed()方法并在反向迭代器上进行迭代以获取反向字符串。

Python代码反转字符串 (Python code to reverse a string )

import sys
def push(element, size, stack):
'''
this function is used to push the elements
in the stack and it will return Error! message
if the stack is full and terminate the program.
'''
global top
if top >= size - 1:
print('Stack Overflow')
sys.exit()
else:
top += 1
stack[top] = element
def pop():
'''
this function is used to pop elements from
the stack and it will return Error! message
if the stack is empty and terminate the program.
'''
global top
if top < 0:
print('Stack Underflow')
sys.exit()
else:
element = stack[top]
print('%s' % element, end='')
top -= 1
def reverse_by_sort(string):
'''
This function is used to reverse any string
by reversed() method.
'''
string = list(string)
rev_str = ''
for i in reversed(string):
rev_str += i
return rev_str
if __name__=='__main__':
size = 11
stack = [0]*size
string = 'Includehelp'
top = -1
# Pushing value in the stack
push('I', 11, stack)
push('n', 11, stack)
push('c', 11, stack)
push('l', 11, stack)
push('u', 11, stack)
push('d', 11, stack)
push('e', 11, stack)
push('h', 11, stack)
push('e', 11, stack)
push('l', 11, stack)
push('p', 11, stack)
print('Original String = %s' % string)
print('\nUsing Stack')
# Popping values from stack and printing them
print('Reversed String = ',end='')
for i in stack:
pop()
print('\n\nUsing sort()')
print('Reversed string = %s' % reverse_by_sort(string))

Output

输出量

Original String = Includehelp
Using Stack
Reversed String = plehedulcnI
Using sort()
Reversed string = plehedulcnI

翻译自: https://www.includehelp.com/python/reverse-a-string-using-stack-and-reversed-method.aspx

python字符串反转方法