33 lines
1.1 KiB
Python
33 lines
1.1 KiB
Python
from calc import evaluator, UndefinedVariable
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#-----------------------------------------------------------------------------
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#
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# Utility functions used in CAPA responsetypes
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def compare_with_tolerance(v1, v2, tol):
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''' Compare v1 to v2 with maximum tolerance tol
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tol is relative if it ends in %; otherwise, it is absolute
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- v1 : student result (number)
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- v2 : instructor result (number)
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- tol : tolerance (string or number)
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'''
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relative = tol.endswith('%')
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if relative:
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tolerance_rel = evaluator(dict(), dict(), tol[:-1]) * 0.01
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tolerance = tolerance_rel * max(abs(v1), abs(v2))
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else:
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tolerance = evaluator(dict(), dict(), tol)
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return abs(v1 - v2) <= tolerance
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def contextualize_text(text, context): # private
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''' Takes a string with variables. E.g. $a+$b.
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Does a substitution of those variables from the context '''
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if not text: return text
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for key in sorted(context, lambda x, y: cmp(len(y), len(x))):
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text = text.replace('$' + key, str(context[key]))
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return text
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