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Sympy integration algorithm towards -infinity

Following achrzesz hint about integral's algorithm option, I encountered the behavior:

integral(1/x^2, x, -infinity, -1, algorithm='sympy')

Unfortunately, I got:

Traceback (click to the left of this block for traceback)
...
AttributeError: 'MinusInfinity' object has no attribute '_sympy_'

What's going wrong?

Sympy integration algorithm towards -infinity

Following achrzesz hint about integral's algorithm option, I encountered the behavior:tried:

integral(1/x^2, x, -infinity, -1, algorithm='sympy')

Unfortunately, I got:

Traceback (click to the left of this block for traceback)
...
AttributeError: 'MinusInfinity' object has no attribute '_sympy_'

What's going wrong?

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Sage version 4.7.2 for the record

Sympy integration algorithm towards -infinity

Following achrzesz hint about integral's algorithm option, I tried:tried (Sage 4.7.2):

integral(1/x^2, x, -infinity, -1, algorithm='sympy')

Unfortunately, I got:

Traceback (click to the left of this block for traceback)
...
AttributeError: 'MinusInfinity' object has no attribute '_sympy_'

What's going wrong?

Sympy integration algorithm towards -infinity

Following achrzesz hint about integral's algorithm option, I tried (Sage 4.7.2):

integral(1/x^2, x, -infinity, -1, algorithm='sympy')

Unfortunately, I got:

Traceback (click to the left of this block for traceback)
...
AttributeError: 'MinusInfinity' object has no attribute '_sympy_'

What's going wrong?

click to hide/show revision 5
retagged

Sympy integration algorithm towards -infinity

Following achrzesz hint about integral's algorithm option, I tried (Sage 4.7.2):

integral(1/x^2, x, -infinity, -1, algorithm='sympy')

Unfortunately, I got:

Traceback (click to the left of this block for traceback)
...
AttributeError: 'MinusInfinity' object has no attribute '_sympy_'

What's going wrong?

Sympy integration algorithm towards -infinity

Following achrzesz hint about integral's algorithm option, I tried (Sage 4.7.2):

integral(1/x^2, x, -infinity, -1, algorithm='sympy')

Unfortunately, I got:

Traceback (click to the left of this block for traceback)
...
AttributeError: 'MinusInfinity' object has no attribute '_sympy_'

What's going wrong?