Python Jinja 将字符串转换为整数
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Jinja convert string to integer
提问by SJC
I am trying to convert a string that has been parsed using a regex into a number so I can multiply it, using Jinja2. This file is a template to be used within an ansible script.
我正在尝试将使用正则表达式解析的字符串转换为数字，以便我可以使用 Jinja2 将其相乘。此文件是要在 ansible 脚本中使用的模板。
I have a series of itemswhich all take the form of <word><number>such as aaa01, aaa141, bbb05.
我有一系列items都采用<word><number>诸如aaa01, aaa141,的形式bbb05。
The idea was to parse the word and number(ignoring leading zeros) and use them later in the template.
这个想法是解析单词和数字（忽略前导零）并稍后在模板中使用它们。
I wanted to manipulate the number by multiplication and use it. Below is what I have done so far ```
我想通过乘法来操纵数字并使用它。以下是我到目前为止所做的```
{% macro get_host_number() -%}
{{ item | regex_replace('^\D*[0]?(\d*)$', '\1') }}
{%- endmacro %}
{% macro get_host_name() -%}
{{ item | regex_replace('^(\D*)\d*$', '\1') }}
{%- endmacro %}
{% macro get_host_range(name, number) -%}
{% if name=='aaa' %}
{{ ((number*5)+100) | int | abs }}
{% elif name=='bbb' %}
{{ ((number*5)+200) | int | abs }}
{% else %}
{{ ((number*5)+300) | int | abs }}
{% endif %}
{%- endmacro %}
{% set number = get_host_number() %}
{% set name = get_host_name() %}
{% set value = get_host_range(name, number) %}
Name: {{ name }}
Number: {{ number }}
Type: {{ value }}
With the above template I am getting an error coercing to Unicode: need string or buffer, int foundwhich i think is telling me it cannot convert the string to integer, however i do not understand why. I have seen examples doing this and working.
使用上面的模板，我收到一个错误coercing to Unicode: need string or buffer, int found，我认为它告诉我它无法将字符串转换为整数，但是我不明白为什么。我见过这样做的例子并且工作。
回答by Konstantin Suvorov
You need to cast string to int after regex'ing number:
您需要在 regex'ing number 后将 string 转换为 int：
{% set number = get_host_number() | int %}
And then there is no need in | intinside get_host_rangemacro.
然后就不需要| int内部get_host_range宏了。
