在 python 課程中解決這個(gè)問(wèn)題，但我終生無(wú)法弄清楚為什么這行不通。我寧愿它給我一個(gè)錯(cuò)誤也不愿打印 0！問(wèn)題給了我顯示的字符串的變量x，需要打印第一次y使用的索引。x = 'Poisson geometry plays an important role in noncommutative geometry.'y = 'u'i = 0while i == 0: for o in x: if o == y: print(y, "is first seen in index = ", y.index(o)) i += 1顯示的代碼返回：u is first seen in index = 0
3 回答
心有法竹
TA貢獻(xiàn)1866條經(jīng)驗(yàn) 獲得超5個(gè)贊
你想要索引x嗎？在這種情況下，使用x.index(o)where 搜索oin x。
x = 'Poisson geometry plays an important role in noncommutative geometry.'
y = 'u'
i = 0
while i == 0:
for o in x:
if o == y:
print(y, "is first seen in index = ", x.index(o))
i += 1
然而，正確的寫(xiě)法是沒(méi)有循環(huán)：
x = 'Poisson geometry plays an important role in noncommutative geometry.'
y = 'u'
print(y, "is first seen in index = ", x.index(y))
輸出：
u is first seen in index = 51
慕桂英546537
TA貢獻(xiàn)1848條經(jīng)驗(yàn) 獲得超10個(gè)贊
您實(shí)際上是在尋找'u'.index('u')
y.index(o)應(yīng)該是x.index(o)這個(gè)例子。
FFIVE
TA貢獻(xiàn)1797條經(jīng)驗(yàn) 獲得超6個(gè)贊
你需要迭代嗎？如果您保留前 2 行然后使用，您將在不使用,或 的情況下x.index(y)獲得相同的結(jié)果。whileforif
x = 'Poisson geometry plays an important role in noncommutative geometry.'
y = 'u'
print(y, "is first seen in index = ", x.index(y))
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