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Fix import errors due to conditional absolute imports #155

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@lpsinger lpsinger commented Nov 1, 2020

There were import errors due to redefinition of the top-level mip module through conditional absolute imports when explicitly specifying the solver:

>>> import mip
>>> mip.Model()
<mip.model.Model object at 0x10f576700>
>>> mip.Model(solver=mip.CBC)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/.../mip/model.py", line 104, in __init__
    self.constrs = mip.ConstrList(self)
UnboundLocalError: local variable 'mip' referenced before assignment
>>> mip.Model(solver=mip.GUROBI)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/.../mip/model.py", line 104, in __init__
    self.constrs = mip.ConstrList(self)
UnboundLocalError: local variable 'mip' referenced before assignment

This patch fixes these imprt errors through selective use of relative imports.

There were import errors due to redefinition of the top-level `mip`
module through conditional absolute imports when explicitly specifying
the solver:

    >>> import mip
    >>> mip.Model()
    <mip.model.Model object at 0x10f576700>
    >>> mip.Model(solver=mip.CBC)
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
      File "/.../mip/model.py", line 104, in __init__
        self.constrs = mip.ConstrList(self)
    UnboundLocalError: local variable 'mip' referenced before assignment
    >>> mip.Model(solver=mip.GUROBI)
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
      File "/.../mip/model.py", line 104, in __init__
        self.constrs = mip.ConstrList(self)
    UnboundLocalError: local variable 'mip' referenced before assignment

This patch fixes these imprt errors through selective use of relative imports.
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