我正在嘗試在input.txt中獲得此字詞列：Suzuki musicChinese musicConservatoryBlue grassRock n rollRhythmCompositionContraInstruments 轉(zhuǎn)換成這種格式："suzuki music", "chinese music", "conservatory music", "blue grass", "rock n roll", "rhythm"...這段代碼：with open ('artsplus_stuff.txt', 'r') as f: list.append(", ".join(['%s' % row for row in f.read().splitlines()])) for item in list: item.lower()print list返回列表，但首字母大寫。['鈴木音樂，中國音樂，音樂學(xué)院，藍(lán)草，搖滾樂，節(jié)奏，作曲，打擊樂，樂器']我該如何將所有項目轉(zhuǎn)換為小寫？
3 回答
慕森王
TA貢獻(xiàn)1777條經(jīng)驗 獲得超3個贊
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錯誤：list.append（“，” .join（['“％s”'f.read（）。splitlines（）]）中行的％類型錯誤：描述符'append'需要一個'list'對象，但已收到'str'注銷
幕布斯6054654
TA貢獻(xiàn)1876條經(jīng)驗 獲得超7個贊
代替
for item in list: item.lower()
將變量的名稱更改list為l或在Python中不是保留字的任何內(nèi)容，并使用以下行，顯然用您為列表命名的任何內(nèi)容l。
l = [item.lower() for item in l]
該lower方法以所有小寫字母返回字符串的副本。創(chuàng)建字符串后，沒有任何內(nèi)容可以修改其內(nèi)容，因此您需要創(chuàng)建一個包含所需內(nèi)容的新字符串。
白衣染霜花
TA貢獻(xiàn)1796條經(jīng)驗 獲得超10個贊
這是可以做到的：
In [6]: l = ['Suzuki music', 'Chinese music', 'Conservatory', 'Blue grass']
In [7]: map(str.lower, l)
Out[7]: ['suzuki music', 'chinese music', 'conservatory', 'blue grass']
您的代碼無法按預(yù)期方式運行的原因之一是item.lower()不會修改字符串（在Python中，字符串是不可變的）。而是返回字符串的小寫版本，然后您的代碼將其忽略。
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