python - 为什么这不打印所有内容而只给出文件中的总字数？

Question

为什么我没有得到想要的结果，而只得到文件中的字数？我还应该获得一个不重复的单词列表以及文件的完整内容。

class text_reader:

# for opening of file
    def __init__(self,file_name):
        global fo
        self.file_name = file_name
        fo=open(file_name,"r")
# for counting no of words in a file
    def wordcount(self):
        num_word=0
        for line in fo:
            words = line.split()
            num_word=num_word + len(words)
        print("Number of words:")
        print(num_word)

# for printing the content of a file   
    def display(self):
        contents = fo.read()
        print(contents)

# for printing list of words in a file and words should not be repeated
    def wordlist(self):
        for x in fo:
            word = x.split()
            list=word.set()
            print(list)



t = text_reader("C:/Users/ALI/Desktop/article.txt")
t.wordcount()
t.display()
t.wordlist()


# article.txt

"""PYTHON IS AN INTERPRETED HIGH-LEVEL PROGRAMMING LANGUAGE FOR GENERAL- 
PURPOSE PROGRAMMING. CREATED BY GUIDO VAN ROSSUM AND FIRST RELEASED IN 1991,
PYTHON HAS A DESIGN PHILOSOPHY THAT EMPHASIZES CODE READABILITY, NOTABLY 
USING SIGNIFICANT """

Answer 1

fo 对象有一个内部指针，它指向 python 应开始读取文件的位置。调用 fo.read() 后，它现在指向文件的末尾(即 python 完成读取的位置)。因此，对 fo.read() 的后续调用现在将从文件的末尾开始，因此返回一个空字符串。

您需要将指针重置到文件的开头，或者在构造函数中调用一次fo.read()并保存结果。