'How to optimize the nested for loop having nested if else in python

l=[]
for index,value in df['Term'].iteritems():
    for i,v in df['Date'].iteritems():
        if index == i:
           if pd.isnull(value):
               l.append(None)
           else:
              value=int(value):
              l.append(v + relativedelta(months=+value)

This is taking a lot of time. Can someone please help me to optimize this function.

python optimization

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'How to optimize the nested for loop having nested if else in python

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