Python 如何从flask上app.py呈现的HTML模板调用app.py中定义的函数
app.py->Python 如何从flask上app.py呈现的HTML模板调用app.py中定义的函数,python,flask,jinja2,Python,Flask,Jinja2,app.py-> def pretty_date(time=False): from datetime import datetime now = datetime.now() if type(time) is int: diff = now - datetime.fromtimestamp(time) elif isinstance(time,datetime): diff = now - time elif not ti
def pretty_date(time=False):
from datetime import datetime
now = datetime.now()
if type(time) is int:
diff = now - datetime.fromtimestamp(time)
elif isinstance(time,datetime):
diff = now - time
elif not time:
diff = now - now
second_diff = diff.seconds
day_diff = diff.days
if day_diff < 0:
return ''
if day_diff == 0:
if second_diff < 10:
return "just now"
if second_diff < 60:
return str(second_diff) + " seconds ago"
if second_diff < 120:
return "a minute ago"
if second_diff < 3600:
return str(second_diff / 60) + " minutes ago"
if second_diff < 7200:
return "an hour ago"
if second_diff < 86400:
return str(second_diff / 3600) + " hours ago"
if day_diff == 1:
return "Yesterday"
if day_diff < 7:
return str(day_diff) + " days ago"
if day_diff < 31:
return str(day_diff / 7) + " weeks ago"
if day_diff < 365:
return str(day_diff / 30) + " months ago"
return str(day_diff / 365) + " years ago"
给出一个错误
UndefinedError:“pretty_date”未定义
有什么方法可以叫它吗?同样的app.py呈现html页面。顺便说一句。如果我没有弄错的话,您必须通过关键字参数在
render\u模板
调用中传递要在html代码中使用的任何内容(函数、变量等)
示例:
render\u模板(“main.html”,pretty\u date=pretty\u date)
您可以在应用程序对象中注册函数,使其全局可用于jinja模板:
app = Flask(__name__)
app.jinja_env.globals.update(pretty_date=pretty_date)
现在任何模板都可以使用{{pretty_date()}}
您还可以在调用render\u template
时传递函数(或任何其他对象类型),但这需要对每个视图都执行,因此如果您想从多个模板调用同一函数,最好全局注册它
app = Flask(__name__)
app.jinja_env.globals.update(pretty_date=pretty_date)