pandas - Cannot initialize python function -


i have (re)wrote back-test function in python using pandas

def backtest(positions,price,initial_capital=10000):     #creating protfolio     portfolio =positions*price['price']         pos_diff=positions.diff()      #creating holidings     portfolio['holidings']=(positions*price['price'].sum(axis=1)     portfolio['cash']=initial_capital-(pos_diff*price['price']).sum(axis=1).cumsum()      #full account equity     portfolio['total']=portfolio['cash']+ portfolio['holidings']     portfolio['return']=portfolio['total'].pct_change()     return portfolio

where positions , price both dataframe of 1 column , 5 column respectively .

inorder checking error run function alone in python returning error

file "", line 8     portfolio['cash']=initial_capital-(pos_diff*price['price']).sum(axis=1).cumsum()  syntaxerror: invalid syntax

missing trailing parenthesis on line before:

portfolio['holidings']=(positions*price['price'].sum(axis=1)                                                ^ need ) here

should be:

portfolio['holidings']=(positions*price['price']).sum(axis=1)

whenever syntax error, @ line before if error , line in question fine , doesn't make sense


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