Add maxCost parameter to plot function

db.py

@@ -41,7 +41,7 @@ def _hist(card=None,date=None,columns=['date','card-num','name','cost']):
 def hist(card=None,date=None,columns=['date','card-num','name','cost']):
     print(_hist(card,date,columns))
 
-def plot(card=None,columns=['cost','cost-min','cost-max']):
+def plot(card=None,columns=['cost','cost-min','cost-max'],maxCost=None):
     """must use either card or date.
         card cand be card-num or name
         date can be a datetime type or a string like 'yyy-mm-dd'
@@ -51,5 +51,6 @@ def plot(card=None,columns=['cost','cost-min','cost-max']):
     plt.title(str(card))
     plt.xlabel("Date")
     plt.ylabel("Cost")
+    plt.ylim(0,maxCost)
     plt.show()