87 lines
2.6 KiB
TeX
87 lines
2.6 KiB
TeX
\section{\module{fnmatch} ---
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\UNIX{} filename pattern matching}
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\declaremodule{standard}{fnmatch}
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\modulesynopsis{\UNIX\ shell style filename pattern matching.}
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\index{filenames!wildcard expansion}
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This module provides support for \UNIX{} shell-style wildcards, which
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are \emph{not} the same as regular expressions (which are documented
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in the \refmodule{re}\refstmodindex{re} module). The special
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characters used in shell-style wildcards are:
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\begin{tableii}{c|l}{code}{Pattern}{Meaning}
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\lineii{*}{matches everything}
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\lineii{?}{matches any single character}
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\lineii{[\var{seq}]}{matches any character in \var{seq}}
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\lineii{[!\var{seq}]}{matches any character not in \var{seq}}
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\end{tableii}
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Note that the filename separator (\code{'/'} on \UNIX) is \emph{not}
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special to this module. See module
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\refmodule{glob}\refstmodindex{glob} for pathname expansion
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(\refmodule{glob} uses \function{fnmatch()} to match pathname
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segments). Similarly, filenames starting with a period are
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not special for this module, and are matched by the \code{*} and
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\code{?} patterns.
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\begin{funcdesc}{fnmatch}{filename, pattern}
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Test whether the \var{filename} string matches the \var{pattern}
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string, returning true or false. If the operating system is
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case-insensitive, then both parameters will be normalized to all
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lower- or upper-case before the comparison is performed. If you
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require a case-sensitive comparison regardless of whether that's
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standard for your operating system, use \function{fnmatchcase()}
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instead.
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This example will print all file names in the current directory with the
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extension \code{.txt}:
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\begin{verbatim}
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import fnmatch
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import os
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for file in os.listdir('.'):
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if fnmatch.fnmatch(file, '*.txt'):
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print file
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\end{verbatim}
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\end{funcdesc}
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\begin{funcdesc}{fnmatchcase}{filename, pattern}
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Test whether \var{filename} matches \var{pattern}, returning true or
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false; the comparison is case-sensitive.
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\end{funcdesc}
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\begin{funcdesc}{filter}{names, pattern}
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Return the subset of the list of \var{names} that match \var{pattern}.
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It is the same as \code{[n for n in names if fnmatch(n, pattern)]}, but
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implemented more efficiently.
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\versionadded{2.2}
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\end{funcdesc}
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\begin{funcdesc}{translate}{pattern}
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Return the shell-style \var{pattern} converted to a regular
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expression.
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Example:
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\begin{verbatim}
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>>> import fnmatch, re
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>>>
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>>> regex = fnmatch.translate('*.txt')
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>>> regex
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'.*\\.txt$'
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>>> reobj = re.compile(regex)
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>>> print reobj.match('foobar.txt')
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<_sre.SRE_Match object at 0x...>
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\end{verbatim}
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\end{funcdesc}
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\begin{seealso}
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\seemodule{glob}{\UNIX{} shell-style path expansion.}
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\end{seealso}
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