mako模板和

Question

I have a problem creating a Mako template, which will take a list of numbers and output their sum. Example:

list = [1, 2, 3, 4, 5]

output:

1 + 2 + 3 + 4 + 5

I want the list to be passed as an argument to the template. Is the way to go around this using python ' + '.join(list) ? I know that we can use \\ to escape new line characters and so I could do it in the loop but then special care needs to be taken with regard to the last + , which is quite ugly.

Thanks!

Answer 1

Built in function sum() should work just fine, see Python doc for sum

Your template body should contain just

def template(context, numbers_list): return sum(numbers_list)

Or, if numbers get passed in as string:

def template(context, numbers_list): return sum(int(x) for x in numbers_list)

Answer 2

First of all, take note that you should never name your variables after built-in types. I am referring to your naming your list ( [1,2,3,4,5] ) as list . This can cause a lot of problems.

Secondly, you can use this code to get your desired result :

def return_desired_result_():
    li=[1,2,3,4,5]
    x=''
    for i in range(len(li)) :
    if i < len(li) -1 :
        x += str(li[i]) + " + "
    else :
        x += str(li[i])
    return x

The code is quite hacky and self explanatory , if however you need any more explanation, just comment.