[英]How to apply a function to a range of columns in dataframe?
我嘗試將 function 應用於我的 dataframe 中一系列列的值,但它顯示錯誤這是我的 dataframe
#define a function to change missing values to NaN
def change_missing(num):
if (num != None) & (type(num) != int) & (type(num) != float):
return np.nan
else:
return num
Energy.iloc[:,1:4].apply(change_missing)
###ValueError: ('The truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all().', 'occurred at index Energy Supply')
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