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The templating language is fairly simple, just {{stuff}}. For
example::
>>> from paste.util.template import Template, sub
>>> sub('Hi {{name}}', name='Ian')
'Hi Ian'
>>> Template('Hi {{repr(name)}}').substitute(name='Ian')
"Hi 'Ian'"
>>> Template('Hi {{name+1}}').substitute(name='Ian')
Traceback (most recent call last):
...
TypeError: cannot concatenate 'str' and 'int' objects at line 1 column 6
It also has Django-style piping::
>>> sub('Hi {{name|repr}}', name='Ian')
"Hi 'Ian'"
Note that None shows up as an empty string::
>>> sub('Hi {{name}}', name=None)
'Hi '
And if/elif/else::
>>> t = Template('{{if x}}{{y}}{{else}}{{z}}{{endif}}')
>>> t.substitute(x=1, y=2, z=3)
'2'
>>> t.substitute(x=0, y=2, z=3)
'3'
>>> t = Template('{{if x > 0}}positive{{elif x < 0}}negative{{else}}zero{{endif}}')
>>> t.substitute(x=1), t.substitute(x=-10), t.substitute(x=0)
('positive', 'negative', 'zero')
Plus a for loop::
>>> t = Template('{{for i in x}}i={{i}}\n{{endfor}}')
>>> t.substitute(x=range(3))
'i=0\ni=1\ni=2\n'
>>> t = Template('{{for a, b in sorted(z.items()):}}{{a}}={{b}},{{endfor}}')
>>> t.substitute(z={1: 2, 3: 4})
'1=2,3=4,'
>>> t = Template('{{for i in x}}{{if not i}}{{break}}'
... '{{endif}}{{i}} {{endfor}}')
>>> t.substitute(x=[1, 2, 0, 3, 4])
'1 2 '
>>> t = Template('{{for i in x}}{{if not i}}{{continue}}'
... '{{endif}}{{i}} {{endfor}}')
>>> t.substitute(x=[1, 2, 0, 3, 0, 4])
'1 2 3 4 '
Also Python blocks::
>>> sub('{{py:\nx=1\n}}{{x}}')
'1'
And some syntax errors::
>>> t = Template('{{if x}}', name='foo.html')
Traceback (most recent call last):
...
TemplateError: No {{endif}} at line 1 column 3 in foo.html
>>> t = Template('{{for x}}', name='foo2.html')
Traceback (most recent call last):
...
TemplateError: Bad for (no "in") in 'x' at line 1 column 3 in foo2.html
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