Jinja | Phaisarn

Installing

Set up a virtual environment

> python -m venv venv
> .\venv\Scripts\activate
(venv) >

ติดตั้ง Jinja2 (จะได้ MarkupSafe มาด้วย)

$ pip install -U Jinja2

> pip list
Package    Version
---------- -------
Jinja2     3.1.2
MarkupSafe 2.1.3
pip        23.0.1
setuptools 65.5.

Example 1

import jinja2

environment = jinja2.Environment()
template = environment.from_string("Hello, {{ name }}!")
st = template.render(name="World")
print(type(st))
print(st)

# <class 'str'>
# Hello, World!

Example 2 – Use an External File as a Template

{# templates/message.txt #}

Hello {{ name }}!

I'm happy to inform you that you did very well on today's {{ test_name }}.
You reached {{ score }} out of {{ max_score }} points.

See you tomorrow!
Anke

# write_messages.py

from jinja2 import Environment, FileSystemLoader

max_score = 100
test_name = "Python Challenge"
students = [
    {"name": "Sandrine",  "score": 100},
    {"name": "Gergeley", "score": 87},
    {"name": "Frieda", "score": 92},
]

environment = Environment(loader=FileSystemLoader("templates/"))
template = environment.get_template("message.txt")

for student in students:
    filename = f"message_{student['name'].lower()}.txt"
    content = template.render(
        student,
        max_score=max_score,
        test_name=test_name
    )
    with open(filename, mode="w", encoding="utf-8") as message:
        message.write(content)
        print(f"... wrote {filename}")

# ... wrote message_sandrine.txt
# ... wrote message_gergeley.txt
# ... wrote message_frieda.txt

รันเสร็จจะได้ไฟล์มา 3 ไฟล์

Example 3 – if

{# templates/message.txt #}

Hello {{ name }}!

{% if score > 80 %}
I'm happy to inform you that you did very well on today's {{ test_name }}.
{% else %}
I'm sorry to inform you that you did not do so well on today's {{ test_name }}.
{% endif %}
You reached {{ score }} out of {{ max_score }} points.

See you tomorrow!
Anke

# write_messages.py

# ...

students = [
    {"name": "Sandrine",  "score": 100},
    {"name": "Gergeley", "score": 87},
    {"name": "Frieda", "score": 92},
    {"name": "Fritz", "score": 40},
    {"name": "Sirius", "score": 75},
]

# ...

Example 4 – Loops

{# templates/results.html #}

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Results</title>
</head>

<body>
  <h1>{{ test_name }} Results</h1>
  <ul>
  {% for student in students %}
    <li>
      {% if student.score > 80 %}?{% else %}?{% endif %}
      <em>{{ student.name }}:</em> {{ student.score }}/{{ max_score }}
    </li>
  {% endfor %}
  </ul>
</body>
</html>

# write_messages.py

# ...

results_filename = "students_results.html"
results_template = environment.get_template("results.html")
context = {
    "students": students,
    "test_name": test_name,
    "max_score": max_score,
}
with open(results_filename, mode="w", encoding="utf-8") as results:
    results.write(results_template.render(context))
    print(f"... wrote {results_filename}")