Question

我想要编程，打开两个文件A.txt和B.txt，在文件A中有句子如：三升牛奶，在B档中有值，如三个2，升3，1 ，牛奶4 我想打开第一个文件并检查单词值并添加这些值并打印，如果值加起来为5.到目前为止，我这样做了：

count=0
with open('shopping.txt') as s: 
     with open('syllables.txt') as f:
      words = {}
      syllables = {}
      for line in f:
        word, syla = line.split()
        words[word] = syla
        syllables[syla] = word
     for lines in s:
       lines=lines.strip()
       lines=lines.split()
       for i in lines:
         lines=words[i]
         print(lines)

我得到的是单词的值，但是在一行中有1个值，在下一行中有另一个值。

文件A包含：

three litres of milk
colour fast shampoo

文件B包含：

sam 2
apple 3
three 2
litres 1
of 1
milk 1
colour 3
fast 1
shampoo 4

我想打印总值为5的行，就像第一行总计5

一样

Answer 1

with open('A.txt') as f1, open('B.txt') as f2:
   #create a dict from fileB and don't forget to convert the count to an integer
   dic = {word : int(val)  for word, val in (line.split() for line in f2)}
   #now iterate over each line in fileA
   for line in f1:
      words = line.split()
      #get the count using `sum()`
      #dict.get would return 0 if key is not found in dic
      count = sum(dic.get(word, 0) for word in words)
      if count == 5:
         print (line, end='')  #or `print (line.strip())`

<强>输出：

three litres of milk

注意：

1。 str.split()负责处理空格，因此不需要str.strip()。

2。在py3.x和py2.7 +中，不需要嵌套with语句。

上述字典理解大致相当于：

dic = {}
for line in f2:
    word, val  = line.split()
    dic[word] = int(val)

打开2个文件并添加值python

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