Digital Solutions

Alternatives to render_template

You can use render_template_string() as shown below if you need a quick test case that uses Jinja2 and Python (Flask) in the one file. However, best practise is to keep HTML template code separate.

injectingJinja2-1.py

from flask import *
app = Flask(__name__)

HTML = """
<h1>{{some_variable}}</h1>
"""

@app.route("/")
def main():
    return render_template_string(HTML, some_variable="memes")
    
app.run(debug=True)

injectingJinja2-2.py

from flask import *
app = Flask(__name__)

HTML = """
<!doctype html>
{% if some_variable == "microsoft" %}
  <h1 style="color:fuchsia;">we love microsoft!</h1>
{% else %}
  <h1 style="color:teal;">we love apple!</h1>
{% endif %}
"""

@app.route("/")
def main():
    return render_template_string(HTML, some_variable="apple")
    
app.run(debug=True)

stringreader.py

from flask import *
app = Flask(__name__)

@app.route("/")
def htmlFile():
  html = ""
  with open(app.root_path + "/templatestring.html") as file:
    html = file.read()
  return html
 
app.run()

templatestring.html

<!-- PUT THIS IN SAME LOCATION AS stringreader.py --> 

<!doctype html>
<h1>template string</h1><br>
<p>some random template garb</p>

<!-- PUT THIS IN SAME LOCATION AS stringreader.py -->