how to string format when string have {
Peter Otten
__peter__ at web.de
Mon Apr 21 04:51:06 EDT 2014
Chris Angelico wrote:
> On Mon, Apr 21, 2014 at 8:34 AM, Mariano DAngelo
> <marianoa.dangelo at gmail.com> wrote:
>> And I want to format like this:
>>
>> context = {
>> "project_name":project_name,
>> "project_url":project_url,
>> }
>>
>> nginx_conf.format(**context)
>>
>>
>> but since the string have { i can't.
>> Is there a way to solve this?
>
> Are you in full control of the source string? You can escape the
> braces as explained here:
>
> https://docs.python.org/3.4/library/string.html#format-string-syntax
>
> If you're not in full control (eg if it comes from a user's input), or
> if you don't like the idea of doubling all your braces, you could
> switch to percent-formatting, or some other form of interpolation. But
> the easiest would be to simply escape them.
Some regex gymnastics in the morning (not recommended):
>>> print(nginx_conf)
server {
listen 80;
server_name dev.{project_url};
location / {
proxy_pass http://127.0.0.1:8080;
include /etc/nginx/proxy.conf;
}
location /media {
alias
/home/mariano/PycharmProjects/{project_name}/{project_name}/media;
expires 30d;
}
location /static {
alias
/home/mariano/PycharmProjects/{project_name}/{project_name}/static;
expires 30d;
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
}
>>> fmt = re.compile(r"((\{)(?!\w)|(?<!\w)(\}))").sub(r"\1\1", nginx_conf)
>>> print(fmt)
server {{
listen 80;
server_name dev.{project_url};
location / {{
proxy_pass http://127.0.0.1:8080;
include /etc/nginx/proxy.conf;
}}
location /media {{
alias
/home/mariano/PycharmProjects/{project_name}/{project_name}/media;
expires 30d;
}}
location /static {{
alias
/home/mariano/PycharmProjects/{project_name}/{project_name}/static;
expires 30d;
}}
error_page 500 502 503 504 /50x.html;
location = /50x.html {{
root html;
}}
}}
>>> print(fmt.format(project_name="MYPROJECT", project_url="MYPROJECT.COM"))
server {
listen 80;
server_name dev.MYPROJECT.COM;
location / {
proxy_pass http://127.0.0.1:8080;
include /etc/nginx/proxy.conf;
}
location /media {
alias /home/mariano/PycharmProjects/MYPROJECT/MYPROJECT/media;
expires 30d;
}
location /static {
alias /home/mariano/PycharmProjects/MYPROJECT/MYPROJECT/static;
expires 30d;
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
}
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