Status: Accepted
Owner: asmeurer
Labels: Type-Defect Priority-Medium

New issue 2000 by asmeurer: Inconsistencies with limit()
http://code.google.com/p/sympy/issues/detail?id=2000

In [20]: x.limit(x, 1, dir='-')
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)

/Users/aaronmeurer/Documents/python/sympy/sympy/<ipython console> in <module>()

TypeError: limit() got an unexpected keyword argument 'dir'

In [21]: x.limit(x, 1, direction='-')
Out[21]: 1

In [22]: limit(x, x, 1, dir='-')
Out[22]: 1

In [23]: limit(x, x, 1, direction='-')
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)

/Users/aaronmeurer/Documents/python/sympy/sympy/<ipython console> in <module>()

TypeError: limit() got an unexpected keyword argument 'direction'

We need to either use dir or direction everywhere. Note that series uses dir.

Also, as long as we are talking abode limit, I noticed that Limit could pretty print the direction, i.e.,

In [24]: Limit(x, x, 1, dir='-')
Out[24]:
lim x
x->1

Should be

In [24]: Limit(x, x, 1, dir='-')
Out[24]:
 lim x
    -
x->1

And assumedly it is possible to create a better looking arrow using unicode (?)


(BTW, issue 2000!)

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