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python script to split a (large) file into multiple (smaller) files with specified number of lines
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#!/usr/bin/env python | |
# -*- coding: utf-8 -*- | |
import sys | |
import os | |
class FileSplitter(object): | |
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""" | |
file_number = '{:04}'.format(file_number) | |
new_file_name = "split_result/%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() |
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