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Django中的常用的函数format_html,用于格式化生成html模板
def format_html(format_string, *args, **kwargs): """ Similar to str.format, but passes allarguments through conditional_escape, and calls 'mark_safe' on the result. Thisfunction should be used instead of str.format or % interpolation to buildup small HTML fragments. """ args_safe = map(conditional_escape, args) kwargs_safe = {k: conditional_escape(v) for(k, v) in six.iteritems(kwargs)} return mark_safe(format_string.format(*args_safe,**kwargs_safe))
可以看到文档说明,format_html类似于str.format函数,格式化生成html元素。
select_html=format_html(‘<select{}>’,’id=id_birth’)
另外一个函数flatatt函数,将字典转换为单个字符串 key=”value”的形式,,如 {‘height’:30,’width’:20,’required’:True},将会转换为字符串‘height=20 widt=30 requried’
def flatatt(attrs): """ Convert adictionary of attributes toa single string. The returnedstring will contain aleading space followed by key="value", XML-stylepairs.It is assumed that the keys do not need to beXML-escaped. If thepassed dictionary is empty,then return an empty string. The resultis passed through'mark_safe'. """ key_value_attrs = [] boolean_attrs = [] for attr,value in attrs.items(): if isinstance(value, bool): if value: boolean_attrs.append((attr,)) else: key_value_attrs.append((attr,value)) return ( format_html_join('', ' {}="{}"', sorted(key_value_attrs)) + format_html_join('', ' {}', sorted(boolean_attrs))
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