BUG:
SettingWithCopyWarning: 
A value is trying to be set on a copy of a slice from a DataFrame

SettingWithCopyWarning: 
A value is trying to be set on a copy of a slice from a DataFrame

SettingWithCopyWarning: 
A value is trying to be set on a copy of a slice from a DataFrame

SettingWithCopyWarning: 
A value is trying to be set on a copy of a slice from a DataFrame