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author | Fred Drake <fdrake@acm.org> | 1998-05-07 01:49:07 (GMT) |
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committer | Fred Drake <fdrake@acm.org> | 1998-05-07 01:49:07 (GMT) |
commit | cda63cc875f54b047018cad362aa23d5493b97f3 (patch) | |
tree | f43f888293bb4046a7622dffefd561b669e993c2 /Doc/libppath.tex | |
parent | bbe33c559403c7e06642111c494bd32d9abe528f (diff) | |
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Relocating file to Doc/lib/
Diffstat (limited to 'Doc/libppath.tex')
-rw-r--r-- | Doc/libppath.tex | 145 |
1 files changed, 0 insertions, 145 deletions
diff --git a/Doc/libppath.tex b/Doc/libppath.tex deleted file mode 100644 index 86b5a34..0000000 --- a/Doc/libppath.tex +++ /dev/null @@ -1,145 +0,0 @@ -\section{Standard Module \module{posixpath}} -\label{module-posixpath} -\stmodindex{posixpath} - -This module implements some useful functions on \POSIX{} pathnames. - -\strong{Do not import this module directly.} Instead, import the -module \module{os} and use \code{os.path}. -\refstmodindex{os} - - -\begin{funcdesc}{basename}{p} -Return the base name of pathname -\var{p}. -This is the second half of the pair returned by -\code{posixpath.split(\var{p})}. -\end{funcdesc} - -\begin{funcdesc}{commonprefix}{list} -Return the longest string that is a prefix of all strings in -\var{list}. -If -\var{list} -is empty, return the empty string (\code{''}). -\end{funcdesc} - -\begin{funcdesc}{exists}{p} -Return true if -\var{p} -refers to an existing path. -\end{funcdesc} - -\begin{funcdesc}{expanduser}{p} -Return the argument with an initial component of \samp{\~} or -\samp{\~\var{user}} replaced by that \var{user}'s home directory. An -initial \samp{\~{}} is replaced by the environment variable \code{\${}HOME}; -an initial \samp{\~\var{user}} is looked up in the password directory through -the built-in module \module{pwd}\refbimodindex{pwd}. If the expansion -fails, or if the path does not begin with a tilde, the path is -returned unchanged. -\end{funcdesc} - -\begin{funcdesc}{expandvars}{p} -Return the argument with environment variables expanded. Substrings -of the form \samp{\$\var{name}} or \samp{\$\{\var{name}\}} are -replaced by the value of environment variable \var{name}. Malformed -variable names and references to non-existing variables are left -unchanged. -\end{funcdesc} - -\begin{funcdesc}{isabs}{p} -Return true if \var{p} is an absolute pathname (begins with a slash). -\end{funcdesc} - -\begin{funcdesc}{isfile}{p} -Return true if \var{p} is an existing regular file. This follows -symbolic links, so both \function{islink()} and \function{isfile()} -can be true for the same path. -\end{funcdesc} - -\begin{funcdesc}{isdir}{p} -Return true if \var{p} is an existing directory. This follows -symbolic links, so both \function{islink()} and \function{isdir()} can -be true for the same path. -\end{funcdesc} - -\begin{funcdesc}{islink}{p} -Return true if -\var{p} -refers to a directory entry that is a symbolic link. -Always false if symbolic links are not supported. -\end{funcdesc} - -\begin{funcdesc}{ismount}{p} -Return true if pathname \var{p} is a \dfn{mount point}: a point in a -file system where a different file system has been mounted. The -function checks whether \var{p}'s parent, \file{\var{p}/..}, is on a -different device than \var{p}, or whether \file{\var{p}/..} and -\var{p} point to the same i-node on the same device --- this should -detect mount points for all \UNIX{} and \POSIX{} variants. -\end{funcdesc} - -\begin{funcdesc}{join}{p\optional{, q\optional{, ...}}} -Joins one or more path components intelligently. If any component is -an absolute path, all previous components are thrown away, and joining -continues. The return value is the concatenation of \var{p}, and -optionally \var{q}, etc., with exactly one slash (\code{'/'}) inserted -between components, unless \var{p} is empty. -\end{funcdesc} - -\begin{funcdesc}{normcase}{p} -Normalize the case of a pathname. On \UNIX{}, this returns the path -unchanged; on case-insensitive filesystems, it converts the path to -lowercase. On Windows, it also converts forward slashes to backward -slashes. -\end{funcdesc} - -\begin{funcdesc}{normpath}{p} -Normalize a pathname. This collapses redundant separators and -up-level references, e.g. \code{A//B}, \code{A/./B} and -\code{A/foo/../B} all become \code{A/B}. It does not normalize the -case (use \function{normcase()} for that). On Windows, it does -converts forward slashes to backward slashes. -\end{funcdesc} - -\begin{funcdesc}{samefile}{p, q} -Return true if both pathname arguments refer to the same file or -directory (as indicated by device number and i-node number). -Raise an exception if a \function{os.stat()} call on either pathname -fails. -\end{funcdesc} - -\begin{funcdesc}{split}{p} -Split the pathname \var{p} in a pair \code{(\var{head}, \var{tail})}, -where \var{tail} is the last pathname component and \var{head} is -everything leading up to that. The \var{tail} part will never contain -a slash; if \var{p} ends in a slash, \var{tail} will be empty. If -there is no slash in \var{p}, \var{head} will be empty. If \var{p} is -empty, both \var{head} and \var{tail} are empty. Trailing slashes are -stripped from \var{head} unless it is the root (one or more slashes -only). In nearly all cases, \code{join(\var{head}, \var{tail})} -equals \var{p} (the only exception being when there were multiple -slashes separating \var{head} from \var{tail}). -\end{funcdesc} - -\begin{funcdesc}{splitext}{p} -Split the pathname \var{p} in a pair \code{(\var{root}, \var{ext})} -such that \code{\var{root} + \var{ext} == \var{p}}, -and \var{ext} is empty or begins with a period and contains -at most one period. -\end{funcdesc} - -\begin{funcdesc}{walk}{p, visit, arg} -Calls the function \var{visit} with arguments -\code{(\var{arg}, \var{dirname}, \var{names})} for each directory in the -directory tree rooted at \var{p} (including \var{p} itself, if it is a -directory). The argument \var{dirname} specifies the visited directory, -the argument \var{names} lists the files in the directory (gotten from -\code{os.listdir(\var{dirname})}). -The \var{visit} function may modify \var{names} to -influence the set of directories visited below \var{dirname}, e.g., to -avoid visiting certain parts of the tree. (The object referred to by -\var{names} must be modified in place, using \keyword{del} or slice -assignment.) -\end{funcdesc} |