merge.py - master - rnekrasov/Python

from __future__ import print_function

import os

# author:zhangshuyx@gmail.com
# !/usr/bin/env python
# -*- coding=utf-8 -*-

# define the result filename
resultfile = "result.csv"


# the merge func
def merge():
    """merge csv files to one file"""

    # indicates use of a global variable.
    global resultfile

    # use list save the csv files
    csvfiles = [
        f
        for f in os.listdir(".")
        if f != resultfile and (len(f.split(".")) >= 2) and f.split(".")[1] == "csv"
    ]

    # open file to write
    with open(resultfile, "w") as writefile:
        for csvfile in csvfiles:
            with open(csvfile) as readfile:
                print("File {} readed.".format(csvfile))

                # do the read and write
                writefile.write(readfile.read() + "\n")
    print("\nFile {} wrote.".format(resultfile))


# the main program


def main():
    print("\t\tMerge\n\n")
    print("This program merges csv-files to one file\n")
    merge()


if __name__ == "__main__":
    main()