Question

Python 2.x. 样本CSV输入（我有很多这些）

67.60.60.24, 1384, application/octet-stream,18/Feb/2015:00:00:50

期望的输出：

insert into mytable (ip, bytes, type, timestamp) values ('67.60.60.24', 1384, 'application/octet-stream', '2015-02-18')

到目前为止：

sqlTemplate = "insert into mytable (ip, bytes, type, timestamp) values ('{0}', {1}, '{2}', '{3}')

# lines contains many of the above sample input CSV lines

for line in lines:
  list = line.split(",")
  list = [elem.strip() for elem in list] # whitespace strip each element
  # Make sure len(list) == 4
  if len(list) != 4:
    continue
  sql = sqlTemplate.format(list) # how can i apply the list to the args?
  # todo: insert sql into DB

Answer 1

您可以使用*运算符解压缩列表。

在你的情况下

sql = sqlTemplate.format(*list)

如果您的列表是[＆＃34; a＆＃34;，＆＃34; b＆＃34;，＆＃34; c＆＃34;]，则此代码与以下内容相同：

sql = sqlTemplate.format("a", "b", "c")

但是，当然，您现在可以使用不同数量的参数调用格式函数

如何将列表应用于string.format（）参数？

1 个答案: