datedown 0.4

Small library to download files with date and time based filenames or folder structures. In parallel using wget.

Small library to download files with date and time based filenames or folder structures. In parallel using wget.

Recursive wget can be slow and result in cumbersome local folder structures. This library downloads exact filenames based on exact dates or a range of dates. Remote and local filenames and paths are built using the Python strftime and strptime format specification

The library uses the Python multiprocessing module to start multiple wget instances for possibly faster downloading. At the end of the download process it verfies that all the files were downloaded. No support for checksums at the moment.

Installation

• Install wget if it is not already on your system.

• pip install datedown

Usage

The program can be used either as a library to be called from other Python programs or as a stand alone command line program.

Use as a command line program

After installation the datedown program should be available in your shell. To get detailed instructions on how to use it run datedown -h.

If it is impossible to know the exact filename on the server then also a recursive version of the script is available under the name datedown_rec.

Example

datedown 2000-01-01 2000-01-02 http://localhost:8888 file_%Y_%m_%d.txt /home/cpa/ --urlsubdirs test_data year_month_subfolders %Y %m

This would download the files

• http://localhost:8888/test_data/year_month_subfolders/2000/01/file_2000_01_01.txt

• http://localhost:8888/test_data/year_month_subfolders/2000/01/file_2000_01_02.txt

to

• /home/cpa/test_data/year_month_subfolders/2000/01/file_2000_01_01.txt

• /home/cpa/test_data/year_month_subfolders/2000/01/file_2000_01_02.txt

Use as a library

For use as a library the most important function is datedown.interface.download_by_dt or datedown.down.download. The first function takes functions that produce urls from Python datetime objects whereas the second takes lists of urls and local filenames. Please see the API Documentation for more details about these functions.

Note

This project has been set up using PyScaffold 3.3 For details and usage information on PyScaffold see http://pyscaffold.readthedocs.org/.