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Uses python eval, string.Template to generate text very fast.

Project description

This project provides a library which allows for very flexible and fast template renderings at the expense of security. It uses python code to generate variables which are then substituted in a string.Template.


Here’s a basic example:

from uftlib import UFTemplate

initial = """import datetime
def f(x):
    return x*x

def getnow():
    return str(

a = 0
b = 100
i = 0"""

oncycle = """a += 3
i += 1
s = f(i)
b += a
now = getnow()"""

template = """Now = ${now}
Render nr. ${i}
f(${i}) = ${s}
b = ${b}
We live in ${where}"""

tpl = UFTemplate(initial, oncycle, template, where="Indonezia")
for text in tpl.render_many(1):

We should get the following output:

Now = 2015-08-25 16:09:07.015948
Render nr. 1
f(1) = 1
b = 103
We live in Indonezia

We can reset the template to it’s initial state and obtain the same results:

for text in tpl.render_many(2):

You should get the following output:

Now = 2015-08-25 16:09:07.016970
Render nr. 1
f(1) = 1
b = 103
We live in Indonezia
Now = 2015-08-25 16:09:07.017298
Render nr. 2
f(2) = 4
b = 109
We live in Indonezia


You can put any kind of python code in the initial section, such as open and read web pages, connect to databases, read and parse other files, but this comes at the expense of security, as malitious code will be run on the same environment as the interpreter. This is a tradeoff which is not advantageous for all projects and needs, so use this library at your own expense.


The three required arguments (initial, oncycle and template) may be stored on a database and may be retrieved by multiple programs in the network, which parallelize and distribute the task. Most templating engines store some of the logic in the template and some of it in the code which calls the template render, leading to a big mess. Use uftlib to cut that corner.

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uftlib-0.2.tar.gz (18.1 kB view hashes)

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