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Most of these are only useful for detecting bad format strings that are known at compile-time. If the format string may come from the user or from a source external to the application, the application must validate the format string before using it. Care must also be taken if the application generates or selects format strings on the fly.
reStructuredText (RST, ReST, or reST) is a file format for textual data used primarily in the Python programming language community for technical documentation.. It is part of the Docutils project of the Python Doc-SIG (Documentation Special Interest Group), aimed at creating a set of tools for Python similar to Javadoc for Java or Plain Old Documentation (POD) for Perl.
The resultant .pot file looks like this with the comment (note that xgettext recognizes the string as a C-language printf format string): TRANSLATORS: %s contains the user's name as specified in Preferences #, c-format #: src/name.c:36 msgid "My name is %s.\n" msgstr ""
#!/usr/bin/env python import sys # Save the current stdout so that we can revert sys.stdout # after we complete our redirection stdin_fileno = sys. stdin stdout_fileno = sys. stdout # Redirect sys.stdout to the file sys. stdout = open ("myfile.txt", "w") ctr = 0 for inps in stdin_fileno: ctrs = str (ctr) # Prints to the redirected stdout sys ...
The string "localhost" will attempt to access the file as UNC path \\localhost\c:\path\to\the file.txt, which will not work since the colon is not allowed in a share name. The dot "." The dot "." results in the string being passed as \\.\c:\path\to\the file.txt , which will work for local files, but not shares on the local system.
The best-known is the string "From " (including trailing space) at the beginning of a line, used to separate mail messages in the mbox file format. By using a binary-to-text encoding on messages that are already plain text, then decoding on the other end, one can make such systems appear to be completely transparent .
The reason for this is to distinguish between a file named '1' and stdout, i.e. cat file 2 >1 vs cat file 2 > & 1. In the first case, stderr is redirected to a file named ' 1 ' and in the second, stderr is redirected to stdout. Another useful capability is to redirect one standard file handle to another.
The ASCII character set is the most common compatible subset of character sets for English-language text files, and is generally assumed to be the default file format in many situations. It covers American English, but for the British pound sign , the euro sign , or characters used outside English, a richer character set must be used.