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

Project description

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")

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

Project details

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