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String slicing - 59 days - Learn Python online for 100 days.

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AI Translation
This post is translated from Chinese into English through AI.View Original
AI-generated summary
Today's task is to determine whether a given English word is a palindrome. The code needs to use the string.reverse() function and meet the requirements of recursion, string slicing, and looping. The user inputs a word, the code checks if it is a palindrome, and prints "yes" or "no". The task was difficult, as the string.reverse() method was not available, so the correct answer had to be found. The explanation of string[-1] and string[:-1] was also challenging, but eventually understood with the help of GPT-4. The code provided is a function called "radar" that checks if a word is a palindrome.

Record#

Today there is no new knowledge to learn, only coding exercises.
The task is to determine whether an English word is a palindrome, meaning it reads the same forwards and backwards. According to the prompt, the function we need to use is string.reverse(), which is a string reversal function.
In the code, we also need to meet three requirements: recursion, string slicing, and loops.
The basic logic of the code is as follows:

  1. User inputs a word.
  2. Check if the word is a palindrome.
  3. Print "yes" or "no".

Today's task is difficult. At first, I thought I could directly use string.reverse() to reverse the string, but later I found out that the string does not have this method, so I had to look at the correct answer.
Then, I spent a long time trying to understand string[-1] and string[:-1]. I asked GPT-3 for help, but I didn't understand. After GPT-4 explained it to me, I finally understood. string[-1] can be understood as the index of the string, representing the last character in the string. And string[:-1] is the usage of string slicing, indicating the range of values, from 0 to the second-to-last character.

CODE#

def radar(vstr):
  if len(vstr) <= 1:
    return True
  elif vstr[0] != vstr[-1]:
    return False
  return radar(vstr[1:-1])


while True:
  vstr = input("Input > ")
  print(radar(vstr))

Translation:

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