python - how to check if pandas dataframe cell contains zeros -

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i doing loop go thorugh series in dataframe. want if both cells zero, skip. have skip because want plot output when 2 cells 'cost' , 'new_cost' zero, give me error:

data:

cost   new_cost 100.00  25.00 0.00     0.00 3.00    10.00

typeerror: empty 'series': no numeric data plot

this mycode:

if df.cost.isempty , df.new_cost.isempty:     continue else:   .

this didnt work: 

if df[df.cost==0.00] , df[df.new_cost==0.00]:     continue else:

but getting valueerror: truth value of dataframe ambiguous. use a.empty, a.bool(), a.item(), a.any() or a.all().

i think want filter dataframe before performing loop (note have enclose boolean conditions in brackets inside indexer):

df_filtered = df[(df.cost != 0) & (df.new_cost != 0)]

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