是否在列表中理解？如何在Python中完成以下操作？row = [unicode(x.strip()) for x in row if x is not None else '']實(shí)質(zhì)上：用空字符串替換所有Nones，然后履行職能。
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斯蒂芬大帝
TA貢獻(xiàn)1827條經(jīng)驗(yàn) 獲得超8個(gè)贊
[unicode(x.strip()) if x is not None else '' for x in row]
[f(x) if condition else g(x) for x in sequence]
if
[f(x) for x in sequence if condition]
iffor…in
?:
value = 123print(value, 'is', 'even' if value % 2 == 0 else 'odd')
瀟瀟雨雨
TA貢獻(xiàn)1833條經(jīng)驗(yàn) 獲得超4個(gè)贊
def change(f): if f is None: return unicode(f.strip()) else: return ''row = [change(x) for x in row]
row = map(change, row)
四季花海
TA貢獻(xiàn)1811條經(jīng)驗(yàn) 獲得超5個(gè)贊
>>> print(", ".join(["ha" if i else "Ha" for i in range(3)]) + "!")Ha, ha, ha!if iFalse0Truerange()
>>> ["ha" if i else "Ha" for i in range(3)]['Ha', 'ha', 'ha']
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