python - 连接多个 CSV 文件

Question

我有一个包含多个 csv 文件的文件夹。每个文件都包含一个日期和一个值列。我想将所有文件合并到一个文件中，其中第一列包含值日期(每个文件都相同)，其他列由每个单一 vile 的值填充，即(日期，value_file1，value_file2 ... )

关于如何通过简单的 python 脚本或通过 unix 命令的 evan 实现这一目标的任何建议？

感谢您的帮助!

Answer 1

我建议使用像 csvkit's csvjoin 这样的工具

pip install csvkit
$ csvjoin --help
usage: csvjoin [-h] [-d DELIMITER] [-t] [-q QUOTECHAR] [-u {0,1,2,3}] [-b]
               [-p ESCAPECHAR] [-z MAXFIELDSIZE] [-e ENCODING] [-S] [-v] [-l]
               [--zero] [-c COLUMNS] [--outer] [--left] [--right]
               [FILE [FILE ...]]

Execute a SQL-like join to merge CSV files on a specified column or columns.

positional arguments:
  FILE                  The CSV files to operate on. If only one is specified,
                        it will be copied to STDOUT.

optional arguments:
  -h, --help            show this help message and exit
  -d DELIMITER, --delimiter DELIMITER
                        Delimiting character of the input CSV file.
  -t, --tabs            Specifies that the input CSV file is delimited with
                        tabs. Overrides "-d".
  -q QUOTECHAR, --quotechar QUOTECHAR
                        Character used to quote strings in the input CSV file.
  -u {0,1,2,3}, --quoting {0,1,2,3}
                        Quoting style used in the input CSV file. 0 = Quote
                        Minimal, 1 = Quote All, 2 = Quote Non-numeric, 3 =
                        Quote None.
  -b, --doublequote     Whether or not double quotes are doubled in the input
                        CSV file.
  -p ESCAPECHAR, --escapechar ESCAPECHAR
                        Character used to escape the delimiter if --quoting 3
                        ("Quote None") is specified and to escape the
                        QUOTECHAR if --doublequote is not specified.
  -z MAXFIELDSIZE, --maxfieldsize MAXFIELDSIZE
                        Maximum length of a single field in the input CSV
                        file.
  -e ENCODING, --encoding ENCODING
                        Specify the encoding the input CSV file.
  -S, --skipinitialspace
                        Ignore whitespace immediately following the delimiter.
  -v, --verbose         Print detailed tracebacks when errors occur.
  -l, --linenumbers     Insert a column of line numbers at the front of the
                        output. Useful when piping to grep or as a simple
                        primary key.
  --zero                When interpreting or displaying column numbers, use
                        zero-based numbering instead of the default 1-based
                        numbering.
  -c COLUMNS, --columns COLUMNS
                        The column name(s) on which to join. Should be either
                        one name (or index) or a comma-separated list with one
                        name (or index) for each file, in the same order that
                        the files were specified. May also be left
                        unspecified, in which case the two files will be
                        joined sequentially without performing any matching.
  --outer               Perform a full outer join, rather than the default
                        inner join.
  --left                Perform a left outer join, rather than the default
                        inner join. If more than two files are provided this
                        will be executed as a sequence of left outer joins,
                        starting at the left.
  --right               Perform a right outer join, rather than the default
                        inner join. If more than two files are provided this
                        will be executed as a sequence of right outer joins,
                        starting at the right.

Note that the join operation requires reading all files into memory. Don't try
this on very large files.