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-rw-r--r--python/analytics/tranche_basket.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/python/analytics/tranche_basket.py b/python/analytics/tranche_basket.py
index ac08a899..94f65d52 100644
--- a/python/analytics/tranche_basket.py
+++ b/python/analytics/tranche_basket.py
@@ -183,7 +183,7 @@ class TrancheBasket(BasketIndex):
def recovery_rates(self):
return np.array([c.recovery_rates[0] for c in self.curves])
- def tranche_theta(self, shortened=4, complement=False, method=['ATM']):
+ def tranche_theta(self, shortened=4, complement=False, method='ATM'):
N = len(self.cs) - shortened
indexshort = deepcopy(self)
indexshort.cs = self.cs[:-shortened]