How to make a real apostrophe or single-quote in LaTeX

Question

I am trying to incorporate programming examples in a LaTeX document.

The document renders nicely with pdflatex; however, the single quotes get transformed into U+2019, a right-single-quotation mark. And, a backtick renders as U+2018, a left-single-quotation-mark.

What I need is a U+0027 real apostrophe so that the code can be successfully cut-and-pasted from the PDF into actual source code.

\documentclass{article}
\usepackage{alltt}
\usepackage{color}
\usepackage{fullpage}

\begin{document}
\center{\LARGE{hello.py}}
\begin{alltt}

{\color{red}print} 'hello world'

\end{alltt}
\end{document}

The same issue exists also with straight typewriter fonts: \tt{don't worry, be happy}. I'm unclear how to control the exact unicode character that is produced.

Answer 1

Use the upquote package; even if the package documentation doesn't mention alltt, it works also with it:

\documentclass{article}
\usepackage{alltt}
\usepackage{upquote}
\usepackage{color}
\usepackage{fullpage}

\begin{document}

\begin{center}
\LARGE hello.py
\end{center}

\begin{alltt}
{\color{red}print} 'hello world'
\end{alltt}

\end{document}

Notice some modifications to the input.

Answer 2

You want to do your own layout? Why not http://en.wikibooks.org/wiki/LaTeX/Packages/Listings?

Listings even allows you to set up colors and the such.

Answer 3

For starting quote use the slash that is before 1 and below tilde. You can use twice for double quote. For closing use the slash that is below ". You can use it twice to close it also. This produces proper quote and unquote symbols.