NameError:Undefined

[GuGuMur]

Hello!
I'm using Mako to generate wikitext.
I want:

• If song_name2 in the parameters set: return the text;
• If not: no treatment.

My code:

from mako.template import Template
temp = Template("""
% if song_name2:
|second=${song_name2}
% endif
"""))
temp.render(song_name2="Stasis")   #return "|second=Stasis"
temp.render()                      #return NameError:Undefined——I want an empty string.

Thanks!

[zzzeek]

the example as given works without issue, because you dont have strict_undefined configured:

from mako.template import Template
temp = Template("""
% if song_name2:
|second=${song_name2}
% endif
""")
print(temp.render(song_name2="Stasis"))
print(temp.render())

if you do have strict_undefined configured, give the template a default using <%page>:

from mako.template import Template
temp = Template("""
<%page args="song_name2='default song'"/>

% if song_name2:
|second=${song_name2}
% endif
""", strict_undefined=True)
print(temp.render(song_name2="Stasis"))
print(temp.render())

[GuGuMur]

It works! Many thanks for your kind and warm help! It seems that I still need to learn more deeply about Mako lol