如何在python中比较和合并两个文件

Question

我有两个文本文件，名称是one.txt和two.txt 在one.txt中，内容是

AAA
BBB
CCC
DDD

在two.txt中，内容为

DDD
EEE

我想要一个python代码来确定one.txt中是否包含two.txt 如果存在，则不执行任何操作，但如果不存在two.txt的内容，则应将其附加到one.txt

我希望one.txt中的输出为

AAA
BBB
CCC
DDD
EEE

代码：

file1 = open("file1.txt", "r") 
file2 = open("file2.txt", "r") 
file3 = open("resultss.txt", "w") 
list1 = file1.readlines() 
list2 = file2.readlines() 
file3.write("here: \n") 
for i in list1: for j in list2: 
   if i==j: file3.write(i)

Answer 1

这对于sets很简单，因为它会照顾你的副本

修改

with open('file1.txt',"a+") as file1, open('file2.txt') as file2:
    new_words = set(file2) - set(file1)
    if new_words:
        file1.write('\n') #just in case, we don't want to mix to words together 
        for w in new_words:
            file1.write(w)

修改2

如果订单很重要，请与Max Chretien回答。

如果您想知道常用词，可以使用交集

with open('file1.txt',"a+") as file1, open('file2.txt') as file2:
    words1 = set(file1)
    words2 = set(file2)
    new_words = words2 - words1
    common = words1.intersection(words2)
    if new_words:
        file1.write('\n')
        for w in new_words:
            file1.write(w)
    if common:
        print 'the commons words are'
        print common
    else:
        print 'there are no common words'

Answer 2

这应该这样做：

$(currentResult).fadeOut("slow").promise().done(function(){
      $(currentResult).hide().insertBefore($(relevantResults[j])).fadeIn('slow');
});

Answer 3

使用set的类似解决方案可能会更短......

with open('one.txt', 'r+') as f_one, open('two.txt', 'r') as f_two:
    res = sorted(set(f_one) | set(f_two))
    f_one.seek(0)
    f_one.writelines(res)