25：更多更多的练习.pdf

25 ：更多更多的练习 练习25. 更多更多的练习 我们将做⼀些关于函数和变量的练习，以确认你真正掌握了这些知识。这节练习 你 来说可以说是：写程序，逐⾏研究，弄懂它。 过这节练习还是有些不同，你不需要运⾏它，取⽽代之，你需要将它导⼊到 python ⾥ 通过⾃⼰执⾏函数的⽅式运⾏。 def break_words(stuff): This function will break up words for us. words = stuff.split( ) return words def sort_words(words): Sorts the words. return sorted(words) def print_first_word(words): Prints the first word after popping it off. word = words.pop( ) print word def print_last_word(words): Prints the last word after popping it off. 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) ⾸先以正常的⽅式python ex25.py运⾏，找出⾥边的错误，并修正。然后你需要 跟着下⾯的答案部分完成这节练习。 你看到的结果 在这节练习中，我们将在Python解析器中，以交互的⽅式和你写的ex25.py⽂件交 流，你可以像下⾯这样在命令⾏中启动python解析器： $ python Python 2.7.1 (r271:86832, Jun 16 2 11, 16:59: 5) [GCC 4 .2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15. Type help, copyright, credits or license for more informat 你的输出应该和我类似，在符号之后，你可以输⼊并⽴即执⾏python代码。我希望 你⽤这种⽅式逐⾏输⼊下⽅的python代码，并看看他们有什么⽤： import ex25 sentence = All good things come to those who wait. words = ex25.break_words(sentence) words sorted_words = ex25.sort_words(words) sorted_words ex25.print_first_word(words) ex25.print_last_word(words) words ex25.print_first_word(sorted_words) ex25.print_last_word(sorted_words) sorted_words sorted_words = ex25.sort_sentence(sentence) sorted_words ex25.print_first_and_last(sentence) ex25.print_first_and_last_sorted(sentence)