On Wednesday, April 25, 2018, Steven D'Aprano <st...@pearwood.info> wrote:
> On Wed, Apr 25, 2018 at 11:22:24AM -0700, Julia Kim wrote: > > Hi, > > > > There’s an error with the string method count(). > > > > x = ‘AAA’ > > y = ‘AA’ > > print(x.count(y)) > > > > The output is 1, instead of 2. > > Are you proposing that there ought to be a version of count that looks > for *overlapping* substrings? > > When will this be useful? "Finding a motif in DNA" http://rosalind.info/problems/subs/ This is possible with re.find, re.finditer, re.findall, regex.findall(, overlapped=True), sliding window https://stackoverflow.com/questions/2970520/string-count-with-overlapping-occurrences n-grams can be by indices or by value. count = len(indices) https://en.wikipedia.org/wiki/N-gram#Examples https://en.wikipedia.org/wiki/String_(computer_science)#String_processing_algorithms https://en.wikipedia.org/wiki/Sequential_pattern_mining > > -- > Steve > _______________________________________________ > Python-ideas mailing list > Python-ideas@python.org > https://mail.python.org/mailman/listinfo/python-ideas > Code of Conduct: http://python.org/psf/codeofconduct/ >
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