如何将Jinja2模板输出存储为字符串

Question

I want to use Jinja2 to store a template as a string variable in python instead of rendering it as a file. How would I go about doing this ?

For example using f-strings I'd do :

template = f""" This is a {foo}"""

Unfortunately f-strings don't suit my needs hence I wanted to try out Jinja2.

Edit : Requirement

cars = {
  'tesla': {
    'cost': '34000',
    'length': '185',
    'range': '220',
  },
  'chevy': {
    'cost': '37000',
    'length': '134',
    'range': '238',
  }

I would like to take the values from this dictionary, insert it into template and store it as a string to be used later.

I tried using the below code but I get an invalid syntax error.

template1 = Template("""Tesla 
                        Cost : {{ cars.tesla.cost }}""")
template2 = template1.render()

# Expected Output
print(template2)
Tesla
Cost : 34000

Answer 1

As its not clear what your requirement is, a simple way to store a jinja2 template in a variable is available through the Template class. The following example from the jinja2 docs shows how you can do it:

from jinja2 import Template
template = Template('Hello {{ name }}!')

If I print template , it shows a Template object stored in memory:

print(template)
#Output
<Template memory:2ea4e10>

You can pass a custom name to the render() and print the template with the value of name :

print(template.render(name='John Wick'))
#Output:
Hello John Wick!

A slightly more complex template can be stored in a simple variable and then passed to Template :

jinja_string = """<title>{{title}}</title>
<ul>
{% for user in users %}
  <li>{{ user }}</li>
{% endfor %}
</ul>"""

template = Template(jinja_string)
users = ["John", "Sam", "Joe"]
print(template.render(title="Users", users=users))

#Output:
<title>Users</title>
<ul>

  <li>John</li>

  <li>Sam</li>

  <li>Joe</li>

</ul>

For the expected output template:

jinja_string = """{{title}}:
{% for car,value in cars.items() %}  
  Car: {{ car }}
  Cost: {{value['cost']}}
  Length: {{value['length']}}
  Range: {{value['range']}}
{% endfor %}
"""

template = Template(jinja_string)

cars = {
  'tesla': {
    'cost': '34000',
    'length': '185',
    'range': '220',
  },
  'chevy': {
    'cost': '37000',
    'length': '134',
    'range': '238',
  }
}

print(template.render(title="Cars", cars=cars))
#Output:
Cars:

  Car: tesla
  Cost: 34000
  Length: 185
  Range: 220

  Car: chevy
  Cost: 37000
  Length: 134
  Range: 238