【python】“笨”办法学Python3习题25-函数练习

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于 2024-02-15 21:12:32 首次发布

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本文介绍了几个Python函数，如break_words用于拆分句子中的单词，sort_words实现单词排序，print_first_word和print_last_word分别获取并打印单词列表的第一个和最后一个单词，sort_sentence对整个句子进行排序并提取首尾词。

def break_words(stuff):
  """This function will break up words for us."""
  #通过指定分隔符对字符串进行切片
  words = stuff.split(' ')
  return words

def sort_words(words):
  """Sorts the words."""
  #sorted(iterable, /, *, key=None, reverse=False)
  #iterable：待排序的序列
  #key：排序规则
  #reverse：指定排序的方式，默认值False，即升序排列
  return sorted(words)

def print_first_word(words):  
  """Prints the first word after popping it off."""
  #pop()函数用于移除列表中的一个元素(默认最后一个元素)，并且返回从列表中移除的元素对象
  #pop(0)表示删除第一个元素并返回该元素
  word = words.pop(0)
  print(word)

def print_last_word(words):
  """Prints the last word after popping it off."""
  #表示删除最后一个元素并返回该元素
  word = words.pop(-1)
  print(word)

def sort_sentence(sentence):
  """Takes in a full sentence and returns the sorted words."""
  words = break_words(sentence)
  return sort_words(words)

def print_first_and_last(sentence):
  """Prints the first and last words of the sentence."""
  words = break_words(sentence)
  print_first_word(words)
  print_last_word(words)

def print_first_and_last_sorted(sentence):
  """Sorts the words then prints the first and last one."""
  words = sort_sentence(sentence)
  print_first_word(words)
  print_last_word(words)

运行步骤和结果

PS D:\pystudy> & D:/anaconda3/python.exe                   
Python 3.11.5 | packaged by Anaconda, Inc. | (main, Sep 11 2023, 13:26:23) [MSC v.1916 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import ex25
>>> sentence = "All good things come to those who wait."
>>> words = ex25.break_words(sentence)
>>> words
['All', 'good', 'things', 'come', 'to', 'those', 'who', 'wait.']
>>> sorted_words = ex25.sort_words(words)
>>> sorted_words
['All', 'come', 'good', 'things', 'those', 'to', 'wait.', 'who']
>>> ex25.print_first_word(words) 
All
>>> ex25.print_last_word(words)
wait.
>>> words
['good', 'things', 'come', 'to', 'those', 'who']
>>> ex25.print_first_word(sorted_words)
All
>>> ex25.print_last_word(sorted_words)  
who
>>> sorted_words
['come', 'good', 'things', 'those', 'to', 'wait.']
>>> sorted_words = ex25.sort_sentence(sentence)
>>> sorted_words
['All', 'come', 'good', 'things', 'those', 'to', 'wait.', 'who']
>>> ex25.print_first_and_last(sentence)
All
wait.
>>> ex25.print_first_and_last_sorted(sentence)
All
who