3 jinja2模板

1 def hello_world():
2     intro = ‘‘  #这里为空或None时候会显示默认值。
3     return render_template(‘index.html‘,intro=intro)
4 
5 {{ intro | default(‘此人很懒，没留下信息。‘,boolean =True)}}
或者：

{{ intro or ‘此人很懒，没留下信息。‘ }}

 1 @app.route(‘/‘)
 2 def hello_world():
 3     intro = ‘hello,world!what are you...?‘
 4 
 5     return render_template(‘index.html‘,intro=intro)
 6 
 7 @app.template_filter(‘my_cut‘)
 8 def cut(value):
 9     value = str(value).replace(‘hello‘,‘Hi‘)
10     return value
11 
12 
13 {{ intro | my_cut }}

 1 @app.route(‘/‘)
 2 def hello_world():
 3     intro = ‘hello,world!what are you...?‘
 4     create_time = datetime(2019,8,15,12,32,15)  #设置任意时间
 5     return render_template(‘index.html‘,intro=intro,create_time=create_time)
 6 
 7 @app.template_filter(‘handle_time‘)  #设置过滤器名称
 8 def handle_time(time):
 9     if isinstance(time,datetime):
10         now = datetime.now()
11         timestamp = (now - time).total_seconds()  #换算为秒
12         if timestamp < 60:
13             return ‘刚刚‘
14         elif timestamp >= 60 and timestamp < 60* 60:
15             return "%s分钟前" %str(int(timestamp / 60))
16         elif timestamp >= 60 * 60 and timestamp < 60 * 60 * 24:
17             return "%s小时前" % str(int(timestamp / 60 / 60))
18         elif timestamp > 60 * 60 * 24:
19             return time.strftime(‘%Y/%m%d %H:%M‘)  #按照‘2019/0815 12:32’格式输出
20     else:
21         return time.strftime(‘%Y/%m%d %H:%M‘)
22 
23 
24 {{ create_time | handle_time }}