在嘗試執(zhí)行擠壓時能夠?qū)?CSV，但它看起來像數(shù)據(jù)框而不是系列？這是我試過的import pandas as pdimport numpy as npdnd_name = pd.read_csv(r"dnd-dataframe.csv", usecols = ["name"], squeeze = True)dnd_name.head()這是我的預期至少我記得學習輸出不是數(shù)據(jù)框而是更像是一個系列？我原以為它會像一個系列而不是數(shù)據(jù)框，看起來像這樣name    bam     Bard        Dagger, sling, club          Transmutation, Enchantmentniem    Sorcerer    light crossbow, battleaxe    Necromancyaem     Paladin     Greataxe                     Abjuration, Conjurationyaeks   Rogue       club, battleaxe              Conjuration, Evocation, Transmutationjeeks   Druid       Dagger, Greataxe             Evocation, Transmutation, NecromancyName: Type, dtype: object這是錯誤但是相反，我收到了一個錯誤    import pandas as pd    import numpy as np        dnd_name = pd.read_csv(r"dnd-dataframe.csv", usecols = ["name"], squeeze = True)    dnd_name.head()收到錯誤    usecols_dtype = lib.infer_dtype(usecols, skipna=False)        ValueError: 'usecols' must either be list-like of all strings, all unicode, all integers or a callable.我也試過這個措辭但看起來也不像預期的那樣    import pandas as pd    import numpy as np            dnd_name = pd.read_csv(r"dnd-dataframe.csv", index_col = "name", squeeze = True)    dnd_name.head()