50 lines
1.2 KiB
Python
50 lines
1.2 KiB
Python
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""" Common Exceptions for `holonomic` module. """
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class BaseHolonomicError(Exception):
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def new(self, *args):
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raise NotImplementedError("abstract base class")
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class NotPowerSeriesError(BaseHolonomicError):
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def __init__(self, holonomic, x0):
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self.holonomic = holonomic
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self.x0 = x0
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def __str__(self):
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s = 'A Power Series does not exists for '
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s += str(self.holonomic)
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s += ' about %s.' %self.x0
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return s
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class NotHolonomicError(BaseHolonomicError):
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def __init__(self, m):
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self.m = m
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def __str__(self):
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return self.m
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class SingularityError(BaseHolonomicError):
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def __init__(self, holonomic, x0):
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self.holonomic = holonomic
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self.x0 = x0
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def __str__(self):
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s = str(self.holonomic)
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s += ' has a singularity at %s.' %self.x0
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return s
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class NotHyperSeriesError(BaseHolonomicError):
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def __init__(self, holonomic, x0):
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self.holonomic = holonomic
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self.x0 = x0
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def __str__(self):
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s = 'Power series expansion of '
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s += str(self.holonomic)
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s += ' about %s is not hypergeometric' %self.x0
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return s
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