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Check for multiple lambdas in add_functions analysis #165

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Check for multiple lambdas in add_functions analysis #165

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8 changes: 5 additions & 3 deletions problem_db/add_functions.tut/analysis.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,14 +2,14 @@ class CodeVisitor(TutorialNodeVisitor):
def __init__(self):
super().__init__()

self.uses_lambda = False
self.lambda_count = 0
self.num_lambda_args = None
self.adds_in_lambda = False

def visit_Lambda(self, node):
super().visit_Lambda(node)

self.uses_lambda = True
self.lambda_count += 1
self.num_lambda_args = len(node.args.args)

if isinstance(node.body, ast.BinOp) \
Expand All @@ -25,8 +25,10 @@ def _analyse(self):
self.add_error('add_functions should accept exactly two args')
else:
# some of these are only safe if the function is defined properly
if not self.visitor.uses_lambda:
if self.visitor.lambda_count == 0:
self.add_error('You need to use a lambda function')
elif self.visitor.lambda_count > 1:
self.add_error('You only need to define one lambda function')
elif self.visitor.num_lambda_args != 1:
self.add_error('Your lambda should only take in a single arg')
elif not self.visitor.adds_in_lambda:
Expand Down