Jinja2 rendering examples in python

jinja2_rendering.py

from jinja2 import Environment, FileSystemLoader, BaseLoader
import yaml


env = Environment(loader=FileSystemLoader("./"), trim_blocks=True, lstrip_blocks=True)
template = env.get_template("simple_template.j2")

# Example of rendering template using dict
vpc = dict(name='dev-west', id='vpc-3432344' )
print(template.render(vpc=vpc))

print('==============================')

# Example of rendering template using YAML file as input
with open('vpc.yml', "r") as stream:
    try:
        vpc = yaml.load(stream)
    except yaml.YAMLError as exc:
        print("===Invalid YAML===")
        print(exc)
        sys.exit(1)
print(template.render(vpc=vpc))

print('==============================')

# Example of rendering template inline
simple_template = """\
The VPC name is {{ vpc.name }}.
The VPC ID is {{ vpc.id }}.
"""

env = Environment(loader=BaseLoader(), trim_blocks=True, lstrip_blocks=True)
template = env.from_string(simple_template)
vpc = dict(name='dev-south', id='vpc-7368494')
print(template.render(vpc=vpc))

simple_template.j2

The VPC name is {{ vpc.name }}.
The VPC ID is {{ vpc.id }}.

vpc.yml

name: 'dev-east'
id: 'vpc-998774'