How to format a LaTeX string in python?

I'm writing an application, part of whose functionality is to generate LaTeX CVs, so I find myself in a situation where I have strings like

\b开发者_开发百科egin{document}
\title{Papers by AUTHOR}
\author{}
\date{}
\maketitle
\begin{enumerate}

%%   LIST OF PAPERS
%%   Please comment out anything between here and the
%%   first \item
%%   Please send any updates or corrections to the list to
%%   XXXEMAIL???XXX

%\usepackage[pdftex, ...

which I would like to populate with dynamic information, e.g. an email address. Due to the format of LaTeX itself, .format with the {email} syntax won't work, and neither will using a dictionary with the %(email)s syntax. Edit: in particular, strings like "\begin{document}" (a command in LaTeX) should be left literally as they are, without replacement from .format, and strings like "%%" (a comment in LaTeX) should also be left, without replacement from a populating dictionary. What's a reasonable way to do this?

---

Why won't this work?

>>> output = r'\author{{email}}'.format(email='user@example.org')
>>> print output
\author{email}

edit: Use double curly braces to "escape" literal curly braces that only LaTeX understands:

>>> output = r'\begin{{document}} ... \author{{{email}}}'.format(
... email='user@example.org')
>>> print output
\begin{document} ... \author{user@example.org}

---

You may not use the new format syntax to avoid escaping the { and }.

That should work:

>>> a = r'''
\title{%(title)s}
\author{%(author)s}
\begin{document}'''

>>> b = a % {'title': 'My Title', 'author': 'Me, Of course'}
>>> print(b)

\title{My Title}
\author{Me, Of course}
\begin{document}

You should use raw strings r'something' to avoid escaping \ as \\.

PS: You should take a look on txt2tags, a Python script to convert t2t formatted text into html, latex, markdown etc. Check the source code to see how these conversions are done.