December 2017
Beginner
412 pages
10h 8m
English
Content preview from Practical Programming, 3rd Edition
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Slicing Lists
Geneticists describe C. elegans phenotypes (nematodes, a type of microscopic worms) using three-letter short-form markers. Examples include Emb (embryonic lethality), Him (high incidence of males), Unc (uncoordinated), Dpy (dumpy: short and fat), Sma (small), and Lon (long). We can keep a list:
| | >>> celegans_phenotypes = ['Emb', 'Him', 'Unc', 'Lon', 'Dpy', 'Sma'] |
| | >>> celegans_phenotypes |
| | ['Emb', 'Him', 'Unc', 'Lon', 'Dpy', 'Sma'] |
It turns out that Dpy worms and Sma worms are difficult to distinguish from each other, so they aren’t as easily differentiated in complex strains. We can produce a new list based on celegans_phenotypes but without Dpy or Sma by taking a slice of ...
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