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[英]How can we change data type of a data frame column from object to string in python?
[英]how i can change column values in a data frame in python
如果年齡 <=8 替換小年齡 >8 和年齡 <12 替換中年齡 >12 替換大,我如何更改年齡列的值。
import pandas as pd
data = pd.read_csv('abalone' )
data.columns= [ 'Sex','Length','Diameter','Height','Whole_weight',
'Shucked_weight','Viscera_weight','shell_weight' ,'Rings']
data.head()
data["age"] = data["Rings"]+1.5
for row in data["age"]:
if row < 12:
data.loc[row,data["age"]]
elif:
data["age"][row]= "medium"
else:
data["age"][row]= "small"
這可以通過首先替換值然后將它們映射到實際需要的值來完成:
data.loc[data['age'] <= 8, 'age'] = 1
data.loc[(data['age'] > 8) & (data['age'] < 12 ), 'age'] = 2
data.loc[data['age'] > 12, 'age'] = 3
data['age'] = data['age'].map({1: 'small', 2: 'medium', 3:'large'})
希望這有幫助
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