Compute the distance between selected or all geoms on QGis 2

distance-geoms.py

import processing

layer = qgis.utils.iface.activeLayer()
# Get all or selected features
features = processing.getfeatures(layer)

# Store all the features on a list
list = [feat for feat in features]
# Get the index of a identifier field
id = layer.fieldNameIndex('ID')

# Double iterate over the list
print "id1;id2;dist"
for feature1 in list:
  for feature2 in list:
    
    id1 = feature1.attributes()[id]
    id2 = feature2.attributes()[id]
    
    # Print the distance if ids are not equal
    if (id1!=id2):
        dist =  feature1.geometry().distance(feature2.geometry())
        print "%s;%s;%.3f" % (id1,id2,dist)