python语句整理

Posted 2020-12-13 merryconei123

pass语句，可在代码块中使用它来让Python什么都不要做。

pass语句还充当了占位符，它提醒你在程序的某个地方什么都没有做，并且以后也许要在这

里做些什么。

 1 def count_words(filename):
 2 
 3     try:
 4         with open(file_name) as file_object:
 5             contents = file_object.read()
 6     except FileNotFoundError:
 7         pass
 8     else:
 9         file_words = contents.split()
10         file_words_nums = len(file_words)
11         print("The file "+file_name+" has about "+str(file_words_nums)+" words.")
12 
13 file_names = [‘guest_book.txt‘,‘book.txt‘,‘guest.txt‘]
14 for file_name in file_names:
15     count_words(file_name)