python script to split a (large) file into multiple (smaller) files with specified number of lines

FileSplitter.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import sys
import os

class FileSplitter:

    def __init__(self):
        self.parse_args(sys.argv)

    @staticmethod
    def run():
        splitter = FileSplitter()
        splitter.split()

    def split(self):

        file_number = 1
        line_number = 1

        print "Splitting %s into multiple files with %s lines" % (os.path.join(self.working_dir, self.file_base_name+self.file_ext), str(self.split_size
))

        out_file = self.get_new_file(file_number)
        for line in self.in_file:
            out_file.write(line)
            line_number += 1
            if line_number == self.split_size:
                out_file.close()
                file_number += 1
                line_number = 1
                out_file = self.get_new_file(file_number)

        out_file.close()

        print "Created %s files." % (str(file_number))

    def get_new_file(self,file_number):
        """return a new file object ready to write to"""
        new_file_name = "%s.%s%s" % (self.file_base_name, str(file_number), self.file_ext)
        new_file_path = os.path.join(self.working_dir, new_file_name)
        print "creating file %s" % (new_file_path)
        return open(new_file_path, 'w')

    def parse_args(self,argv):
        """parse args and set up instance variables"""
        try:
            self.split_size = 1000
            if len(argv) > 2:
                self.split_size = int(argv[2])
            self.file_name = argv[1]
            self.in_file = open(self.file_name, "r")
            self.working_dir = os.getcwd()
            self.file_base_name, self.file_ext = os.path.splitext(self.file_name)
        except:
            print self.usage()
            sys.exit(1)

    def usage(self):
        return """
        Split a large file into many smaller files with set number of rows.

        Usage:

            $ python file_splitter.py <file_name> [row_count]

        row_count is optional (default is 1000)
        """

if __name__ == "__main__":
    FileSplitter.run()

Nice utility. I faced issues on Python 3.8. Fix is using print().
I am new to python so don't know the cause for this issue. Seems some broken API in the language syntax.

Thanks for the message @SubodhChiwate-TomTom

This is an older script developed with Python 2.7. In the Python 3+ versions, the print function must wrap its argument in parentheses.

If you are using Linux, there is the split utility which will be faster and more effective than this script. https://pubs.opengroup.org/onlinepubs/9699919799/utilities/split.html