Example gravatar implementation for Python 2 *and* 3, using libgravatar

gistfile1.txt

# For just python:

pip install libgravatar

# libravatar documentation/options at:
# http://libgravatar.readthedocs.io/

# Then:

from libgravatar import Gravatar
g = Gravatar('myemailaddress@example.com')
g.get_image()
# (returns working URL to gravatar image)

# ----------

# For Django (as a template tag/filter), in file templatetags/mytags.py

@register.filter
def gravatar(email, size=40):
    '''Get commenter's avatar from Gravatar service via API'''
    g = Gravatar(email)
    return g.get_image(size, "mm")

# Then in your templates:
{% load mytags %}

{# Replace number with preferred dimensions. #}
<img src="{{ comment.email|gravatar:60 }}" alt="" />