Jinja2解压缩元组列表

Question

How can I unzip a list of tuples? I have got

 x = [(1,'a'), (2, 'b')....]

And want to have

 x1 = [1,2..]
 x2 = ['a', 'b'...]

I have set a zip filter in my flask app but I am not sure is it a proper approach:

 app.jinja_env.filters['zip'] = zip

And in template

{% set x1, x2 = *x|zip %} 

But there is also no * feature in jinja. How to solve that? Thanks

Answer 1

You could define a function that star unpacks its input into zip :

def unpack_and_zip(x):
    return zip(*x)

Then register that as your filter

app.jinja_env.filters['unpack_and_zip'] = unpack_and_zip

{% set x1, x2 = x|unpack_and_zip %}