About the Flask filter
The function of the filter provided by Flask is limited, and it can't meet the user's requirements in many cases.
Therefore, Flask provides the user with a template filter decorator, which is used to create user-defined filters
Time display
Regular users of blogs will notice that the general rules for displaying blog publishing time are as follows:
| Time slot | Display format |
|---|---|
| Within 1 minutes | just |
| 1 to 60 minutes | How many minutes ago |
| 1-24 hours | How many hours ago |
| 1 to 30 days | How many days ago? |
| More than 30 days. | Specific time |
| Non time data | Original content (code adaptive exception scenario) |
Time filter
# -*- coding: utf-8 -*- # @Author: Wang Xiang # @JianShu: Qingfeng Python # @Date : 2019/5/23 23:56 # @Software : PyCharm # @version : Python 3.6.8 # @File : app.py from flask import Flask, render_template import datetime app = Flask(__name__) _now = datetime.datetime.now() @app.template_filter("time_filter") def time_filter(time): if not isinstance(time, datetime.datetime): return time _period = (_now - time).total_seconds() if _period < 60: return "just" elif 60 <= _period < 3600: return "%s Minutes ago" % int(_period / 60) elif 3600 <= _period < 86400: return "%s Hours ago" % int(_period / 3600) elif 86400 <= _period < 2592000: return "%s Days ago" % int(_period / 86400) else: return time.strftime('%Y-%m-%d %H:%M') @app.route('/') def index(): timeList = [ 'abcd', _now, _now - datetime.timedelta(minutes=5), _now - datetime.timedelta(hours=10), _now - datetime.timedelta(days=15), _now - datetime.timedelta(days=150) ] return render_template('index.html', timeList=timeList) if __name__ == '__main__': app.run()
Corresponding HTML basic template:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Intelligent display time</title> {% for time in timeList %} <ul> <li> <p>{{time}}</p> <p>{{time|time_filter}}</p> </li> </ul> {% endfor %} </head> <body> </body> </html>
Code implementation effect
github: https://github.com/KingUranus/FlaskTests
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