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allow no Explicable in merge_history and improve doctest

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This commit is contained in:
Benjamin Bertrand 2016-03-07 12:09:56 +03:00
parent 20d1ad8528
commit d1f074e8df
1 changed files with 23 additions and 2 deletions
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23
pymath/calculus/explicable.py
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@ -125,6 +125,8 @@ class Explicable(Renderable):
def merge_history(expl1, expl2, operation):
r""" Take two Explicable objects, explain where they are from and merge their history
This method try to use 'explain' method from expl1 and expl2. This means that after using this method, those two objects will become amnesiac.
:param expl1: fist explicable
:param expl2: second explicable
:param operation: the operation that link them
@ -146,11 +148,30 @@ class Explicable(Renderable):
['2 + 10 \\times 4', '2 \\times 12', +]
['2 + 40', '24', +]
['42', '24', +]
>>> for i in action1.explain():
... print(i)
>>> action1 = Explicable()
>>> action1.postfix_tokens = Expression('42')
>>> action1.this_append_before([Expression('2+10*4'), Expression('2+40')])
>>> m_history = Explicable().merge_history(action1, 12, op.add)
>>> m_history
<generator object transpose_fill ...>
>>> for i in m_history:
... print(i)
['2 + 10 \\times 4', 12, +]
['2 + 40', 12, +]
['42', 12, +]
"""
try:
steps1 = list(expl1.explain())
steps2 = list(expl2.explain())
except AttributeError:
steps1 = [expl1]
try:
steps2 = list(expl2.explain())
except AttributeError:
steps2 = [expl2]
return transpose_fill([steps1, steps2, [operation]])