customized template don't support two keys in a row if one key is "last_modified_time"

[ouxiaogu]

Customized template for Python:

-*- coding: utf-8 -*-
Created: {{author}}, {{create_time}}

Last Modified : {{last_modified_by}}, {{last_modified_time}}

For the 1st time to add a header, the result is fine, but when to update {{last_modified_time}} at saving file, the key string "{{last_modified_time}} " will be shown there, not the modified time:

-*- coding: utf-8 -*-
Created: xxx, 2017-12-11 17:52:10

Last Modified:  xxx, {{last_modified_time}}

The result when to swap {{last_modified_by}} and {{last_modified_time}}:

-*- coding: utf-8 -*-
Created: xxx, 2017-12-11 17:52:10

Last Modified:  2018-01-24 14:59:54 by {{last_modified_by}}