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from render_block.exceptions import BlockNotFound
def jinja2_render_block(template, block_name, context):
# Get the underlying jinja2.environment.Template object.
template = template.template
# Create a new Context instance.
context = template.new_context(context)
# Try to find the wanted block.
try:
gen = template.blocks[block_name](context)
except KeyError:
raise BlockNotFound("block with name '%s' does not exist" % block_name)
# The result from above is a generator which yields unicode strings.
return ''.join([s for s in gen])
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