文本fi中的单词集

Question

我正在尝试创建一组单词，这意味着严格意义上只从.txt文件的字母表。此txt文件包含所有可能的字符，包括不可打印的文本。在

没有re或集合库。Python3

例如，给定一个.txt文件

*eBooks$ Readable By Both Humans and By Computers, Since 1971**

*These# eBooks@ Were Prepared By Thousands of Volunteers!

我需要我的设备来容纳

^{pr2}$

这是我所做的，但我仍然得到一些特殊的字符和数字在我的集合。我只想要字母表

import string
filecontent = []
word_set = {}
with open ("small.txt") as myFile:
    for line in myFile:
        line = line.rstrip()
        line = line.replace("\t","")
        for character in line:
            if character in string.digits or character in string.punctuation:
                line = line.replace(character, "")
            if line != "":
                filecontent.append(line)
lowerCase = [x.lower() for x in filecontent]
word_set = {word for line in lowerCase for word in line.split()}

Answer 1

如果我是你，我已经习惯了关于芬德尔在

import re
s = '''*eBooks$ Readable By Both Humans and By Computers, Since 1971**
*These# eBooks@ Were Prepared By Thousands of Volunteers!'''
set(re.findall('[a-zA-Z]+',s))

输出

^{pr2}$