Debug a pandas labelling step that has no effect
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df[df["score"] > 0.5]["label"] = 1
print(df["label"].tolist()) # expected [0, 1, 1, 0] but prints [0, 0, 0, 0]
A SettingWithCopyWarning appears. Explain the bug and fix it. Then comment on this variant:
high = df[df["score"] > 0.5]
high[] =