Question

我有一个包含不同单词行的文本文件（.txt）例如：

  SELECT SFLIGHT-CARRID SFLIGHT-CONNID SFLIGHT-FLDATE
         AIRPFROM AIRPTO
         DEPTIME
         SEATSMAX SEATSOCC
         FROM SPFLI                    " connections
         INNER JOIN SFLIGHT            " flights
           ON  SPFLI~CARRID = SFLIGHT~CARRID
           AND SPFLI~CONNID = SFLIGHT~CONNID
         INNER JOIN SCITAIRP AS F      " Mapping cities to
           ON SPFLI~AIRPFROM = F~AIRPORT      " airports
         INNER JOIN SCITAIRP AS T
           ON SPFLI~AIRPTO = T~AIRPORT
         WHERE F~COUNTRY    = FROMCOUNTRYKEY    " restrictions
         AND   F~CITY       = FROMCITY
         AND   T~COUNTRY    = TOCOUNTRYKEY
         AND   T~CITY       = TOCITY
         **AND   FLDATE       >= SY-DATUM**
         AND   DEPTIME      > AFTERNOON_HLP
         AND   SPFLI~CARRID IN CARRID
         ORDER BY FLDATE AIRPFROM AIRPTO.

如何使用Multimap<String, String> map = ArrayListMultimap.create(); map.put("MiddleName", null); map.putAll("EmailAddress", ImmutableList.of("toni@gmail.com", "mary@gmail.com", "paul@gmail.com")); // that's the key with the "biggest" collection within the map int biggest = map.asMap().entrySet().stream().collect(Collectors.reducing(0, entry -> entry.getValue().size(), Integer::max)); Multimap<String, String> newMap = ArrayListMultimap.create(); // "padding" the collection when required map.keySet().stream().forEach(key -> { int currentSize = map.get(key).size(); newMap.putAll(key, map.get(key)); if (currentSize < biggest) { newMap.putAll(key, Collections.nCopies(biggest - currentSize, (String) null)); } }); System.out.println(newMap); // {MiddleName=[null, null, null], EmailAddress=[toni@gmail.com, mary@gmail.com, paul@gmail.com]} }命令获取第2列...所以2和12例如是文本？

Answer 1

假设,周围没有空格：

with open('file.txt') as f:
    for line in f:
        print(line.split(',')[1])

如果可能有空格，请使用re.split()：

with open('file.txt') as f:
    for line in f:
        print(re.split(r'\s?,\s?', line)[1])

Answer 2

首先，您必须将文件拆分为线条（只需通过迭代即可轻松完成），而不必从每一行中提取第二列。

简单示例：

with open("myfile.txt") as myfile:
    for line in myfile:
        print(line.split(",")[1]) # indexing starts at 0

累积值列表：

with open("myfile.txt") as myfile:
    mylist = [line.split(",")[1] for line in myfile]

Python拆分文本

2 个答案: