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"""Implements the SimulationOutput class."""
def isSorted(x):
"""Return true if the sequence is sorted."""
if len(x) == 0:
return True
for i in range(len(x) - 1):
if x[i] > x[i + 1]:
return False
return True
class SimulationOutput:
"""A base class for simulation output."""
def __init__(self, recordedSpecies, recordedReactions):
# The recorded species.
self.recordedSpecies = recordedSpecies
# The recorded reactions.
self.recordedReactions = recordedReactions
def hasErrors(self):
"""Return None if valid. Otherwise return an error message."""
if not self.recordedSpecies and not self.recordedReactions:
return 'There are no recorded species or reactions.'
return None
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