python - Multiplication on slice of pandas dataframe -

i have dataframe this:

  year       a_annex    arnston     bachelor         berg      1955      1.625       0.940         nan            nan      1956      1.219       1.018         nan            nan      1957      2.090       1.20          nan            1.190      1958      0.950       1.345         nan            1.090 

and want multiply in [1:,1:] .404

the code trying is:

df=pd.read_csv(r'h:\sheyenne\grazing records\master_amu_complete.csv') hectare=0.404 df=df.iloc[1:,1:] df=df*hectare 

but returns:

typeerror: not operate 0.404686 block values can't multiply sequence non-int of type 'float' 

printing df.info() says after slice non-null object if helps.

yes, problematic value. can find these problematic values function (thanks ajcr):

df = df.convert_objects(convert_numeric=true)  

first nan converted 0, apply function above , return nan instead of problematic values. have find rows nan values , return subset of original df.

print df    year  a_annex arnston  bachelor  berg 0  1955    1.625   0.940       nan   nan 1  1956    1.219   1.018       nan   nan 2  1957    2.090   1.20a       nan  1.19 3  1958    0.950  1.345a       nan  1.09  test = df.fillna(0) test = test.convert_objects(convert_numeric=true)     year  a_annex  arnston  bachelor  berg 0  1955    1.625    0.940         0  0.00 1  1956    1.219    1.018         0  0.00 2  1957    2.090      nan         0  1.19 3  1958    0.950      nan         0  1.09  test = df[test.isnull().any(axis=1)]     year  a_annex arnston  bachelor  berg 2  1957     2.09   1.20a       nan  1.19 3  1958     0.95  1.345a       nan  1.09  hectare=0.404 df=df.iloc[1:,1:] df=df*hectare print df