osm-iterator 0.0.6

Iterate over .osm file and call a provided callback function for each element

This code loads .osm file and allows to call function on all OSM objects in dataset.

It is distributed as an osm_iterator PyPI package.

Usage example:

from osm_iterator.osm_iterator import Data

def show_places(element):
    place_tag = element.get_tag_value("place")
    name_tag = element.get_tag_value("name")
    osm_object_url = element.get_link()
    if place_tag != None:
        print(name_tag + " is an object " + osm_object_url)

osm = Data("file.osm")
osm.iterate_over_data(show_places)

Design explanation: this code has deeply suboptimal handling of pretty much everything. For start, all data is loaded into memory and then duplicated in-memory dataset is created.

As result, attempt to process any large datasets will cause issues due to excessive memory consumption.

This situation is consequence of following facts

• This code was written during my first attempt to process OSM data using Python
• API allows (at least in theory) to painlessly switch to real iterator that is not loading all data into memory at once
• So far this was good enough for my purposes so I had no motivation to spend time on improving something that is not a bottleneck

Though, if someone has good ideas (especially in form of a working code) - comments and pull requests are welcomed.

Running tests

nosetests3 or python3 -m unittest

Publishing new version

• run tests (see section above)
• bump version in setup.py file in the top directory
• from the top directory run python3 setup.py sdist bdist_wheel and twine upload dist/*
• one can make local install, without publishing to PyPi. Run from dist folder command like pip3 install osm_iterator-0.0.4-py3-none-any.whl