python - Why does Pandas give me only one SettingWithCopyWarning? -


i have following code:

import pandas pd import numpy np mydf = pd.dataframe({'uid':[1,2,3],                      'price':[10,20,30],                      'shipped':[2,4,6]}) grouped = mydf.groupby('uid').aggregate(np.sum) # call 1 mydf['price'].loc[:] = np.round(grouped['price'], 2) # call 2 mydf['shipped'].loc[:] = grouped['shipped']

the line have preceded call 1 executes no errors or warnings. line have preceded call 2 results in settingwithcopywarning error. why 1 result in error , not other? can in second call in order rid of error?

my code executes fine, i'm tired on seeing 1 lone error every time run tests.

no settingwithcopywarning error

mydf['shipped'].values[:] = grouped['shipped']

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