Package: scanf
scanf: A small scanf implementation for pythonPython has powerful regular expressions but they can be totally
overkill for many simpler situations. Additionally, some common
numerical formats require quite complex regex's to match them
robustly. This python implementation of scanf internally translates the simple
scanf format into regular expressions, then returns the parsed values.Usagescanf.scanf(format, s=None, collapseWhitespace=True)Argumentsformat:This is the format string comprised of plain text and tokens from the
table below.s:String to be parsedcollapseWhitespace:When True, tells scanf to perform a greedy match with
whitespace in the input string, allowing for easy parsing of text that has
been formatted to be read more easily. This enables better matching in log files where the data
has been formatted for easier reading. These cases have variable
amounts of whitespace between the columns, depending on the number of
characters in the data itself.scanf supports the following formats:PatternMeaning%cOne character%5c5 characters%d, %iint value%7d, %7iint value with length 7%ffloat value%ooctal value%X, %xhex value%sstring terminated by whitespaceAny pattern with a * after the % (e.g., '%*f') will result in scanf matching the pattern but
omitting the matched portion from the results.  This is helpful when parts of
the input string may change but should be ignored.The underlying regex operation is performed using 'search' rather than 'match',
so scanf will return a match if the pattern string is matched anywhere in the line.Examples:>>> from scanf import scanf
>>> scanf("%s - %d errors, %d warnings", "/usr/sbin/sendmail - 0 errors, 4 warnings")
('/usr/sbin/sendmail', 0, 4)

>>> scanf("%o %x %d", "0123 0x123 123")
(83, 291, 123)

>>> pattern = 'Power: %f [%], %s, Stemp: %f'
>>> text = 'Power:   0.0 [%], Cool, Stemp: 23.73'
>>> scanf(pattern, text)
(0.0, 'Cool', 23.73)

>>> pattern = 'Power: %f [%], %*s, Stemp: %f'   # note the '*' in %*s
>>> scanf(pattern, text)
(0.0, 23.73)scanf returns a tuple of parsed values if the input pattern is matched, or None if the format does not match.Other resourcesFor more information see:http://en.wikipedia.org/wiki/Scanfhttps://github.com/joshburnett/scanfOriginal (pre-1.0) code from:http://code.activestate.com/recipes/502213-simple-scanf-implementation/Releases1.5.1: 2018-10-04Fixed installation issue1.5.1: 2018-10-04Re-added Python 2.7 compatibility via backports.functools_lru_cache (thanks @eendebakpt!)1.5: 2018-10-01Fixed Python 3.7 compatibility (scanf_compile broke in 3.7 due to differences in re.sub)Changed caching to functools.lru_cache (in Python 3 standard library)Dropping Python 2 support, as lru_cache is not in Python 2 standard libraryCaching now takes collapseWhitespace into account (thanks @prittenhouse!)1.4.1: 2017-04-05Added $^| characters to the list of special characters to escape in 'scanf_compile'. Thanks @MichaelWedel!1.4: 2016-12-03Small modification to scanf.py for Python3 compatibility. Thanks @Gattocrucco!Changed README.md to README.rst, removing pypandoc dependency in setup.pyRemoved most of the comments at the beginning of scanf.py, as they were
redundant with those in the README.1.3.1 - 1.3.3: 2016-06-23Initial release to PyPIFixed various issues with metadata for PyPI1.3: 2016-01-18Added 'extractdata' function.1.2: 2013-05-30Added 'collapseWhitespace' flag (defaults to True) to take the search
string and replace all whitespace with regex string to match repeated
whitespace. This enables better matching in log files where the data
has been formatted for easier reading. These cases have variable
amounts of whitespace between the columns, depending on the number of
characters in the data itself.1.1: 2010-10-13Changed regex from 'match' (only matches at beginning of line) to
'search' (matches anywhere in line)Bugfix - ignore cast for skipped fields1.0: 2010-10-11Initial release (internal)