jinja2_env.py

#coding: utf-8
"""添加自定义过滤器"""
from jinja2 import Environment
from jinja2.runtime import Undefined

def do_date(date, format):
    """时间格式化
    ~ 用法：{{xxx|date('%Y-%m-%d %H:%M:%S')}}
    """
    s = date.strftime(format.encode('utf-8'))
    return s.decode('utf-8')

filters = {
    'date': do_date,
}

def finalize(o):
    "把None换成空"
    return '' if o is None else o

class Env(Environment):
    
    def __init__(self, *args, **kw):
        Environment.__init__(self, *args, **kw)
        # 把未定义变量和None处理为空字符串
        self.finalize = finalize
        self.undefined = Undefined
        self.filters.update(filters)