如何遍历 pandas dataframe 列并检查每列的数据类型并在需要时将其更改为另一种数据类型

Question

I have a dataframe "df". I'm trying to access all the columns of the dataframe and check the datatype of each column and if the datatype is "object" i want to change it to float.

I'm trying with the below code, but it is not working:

for colname, coltype in df.dtypes.iteritems():
    if coltype == object:
         df[colname] = df[colname].astype(np.float32)

I don't understand what is wrong here. Can anyone help me out please?

Answer 1

you can try this code

types={}
for col in df.columns:
    if df[col].dtype == object:
        types[col] = float
    else:
        types[col] = df[col].dtype
df = df.astype(types)