#19381: Refactor Graph.__init__
----------------------------+---------------------------------
   Reporter:  ncohen        |            Owner:
       Type:  defect        |           Status:  new
   Priority:  major         |        Milestone:  sage-6.9
  Component:  graph theory  |         Keywords:
  Merged in:                |          Authors:  Nathann Cohen
  Reviewers:                |  Report Upstream:  N/A
Work issues:                |           Branch:
     Commit:                |     Dependencies:
   Stopgaps:                |
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 This (very unpleasant) ticket attempts to clean a bit more the content of
 `Graph.__init__`.

 To this end, it creates a `graph_input` modules that gathers into
 individual functions the different pieces of code that build a graph from
 <any other data>.

 Admittedly, this is just one step toward a cleaner graph constructor, but
 we are not there yet.

 Nothing smart is done in this branch: the pieces of code from
 `Graph.__init__` are moved to new individual functions (some
 variables/parameters are renamed). One from `DiGraph.__init__` is moved
 too.

 In particular, some pieces of code from `DiGraph.__init__` may eventually
 be merged with the functions that this branch creates, but this will be
 done later.

 This branch is already sufficiently long and sufficiently unpleasant to
 write/review `:-/`

 Nathann

--
Ticket URL: <http://trac.sagemath.org/ticket/19381>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
and MATLAB

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