df = pd.DataFrame([[[]]])
df.columns = ["col"]
df.query("col == []") # 不会按照字面意思筛选单元格值==[]
# df["col"] == [] # valueError
df.loc[df["col"].astype(str) == "[]"]
df.query("col.astype('str') == '[]'") # keyerror if str without ''
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df = pd.DataFrame([[[]]])
df.columns = ["col"]
df.query("col == []") # 不会按照字面意思筛选单元格值==[]
# df["col"] == [] # valueError
df.loc[df["col"].astype(str) == "[]"]
df.query("col.astype('str') == '[]'") # keyerror if str without ''
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