[英]IndexError: string index out of range on my function
我正在嘗試創建一個函數,該函數使我可以拆分一個字符串並將每個單詞添加到列表中,然后不使用.split()命令而返回該列表中以某個字母開頭的單詞。 函數的第一部分(將字符串拆分並將每個單詞添加到列表中)工作得很好。 問題是當嘗試返回該列表中以某個字母開頭的值時。 這是我的代碼:
def getWordsStartingWith(text, letter):
split_text = [] #This is where each word is appeneded to.
text_addition = "" #This is where the letters from the string are added.
number = 0
gWSW = []
for str in text:
if str == ' ' or str == "'": # Checks to see whether the letter is a space or apostrophy.
split_text.append(text_addition)
text_addition = "" #If there is, then the letters collected so far in text_addition are apended to the list split_text and then cleared from text_addition
else:
text_addition += str #If not, then the letter is added to the string text_addition.
while number < len(split_text)-1:
if split_text[number][0] == letter:
gWSW.append(split_text[number])
number += 1
else:
number += 1
else:
return gWSW
問題在於線
如果split_text [number] [0] ==字母:
如標題中所述返回IndexError。 我很確定它與正在使用的[number]變量有關,但不確定該怎么做。
就像您對問題的評論中指出的那樣,您在其中也有很多問題,首先您要刪除最后一個單詞,可以通過以下方法解決此問題:
else:
text_addition += str #If not, then the letter is added to the string text_addition.
# Avoid dropping last word
if len(text_addition):
split_text.append(text_addition)
while number < len(split_text)-1:
if split_text[number][0] == letter:
然后,我認為您的IndexError問題是在您有兩個“空格”時出現的,在這種情況下,您正在添加一個空字符串,並且由於它沒有任何char [0],因此是indexError。 您可以使用以下方法解決此問題:
for str in text:
if str == ' ' or str == "'": # Checks to see whether the letter is a space or apostrophy.
if text_addition:
# Here we avoid adding empty strings
split_text.append(text_addition)
text_addition = "" #If there is, then the letters collected so far in text_addition are apended to the list split_text and then cleared from text_addition
else:
text_addition += str #If not, then the letter is added to the string text_addition.
那只是為了回答您的問題。
PD:我在最后一部分所做的一點改進是:
result = []
for str in split_text:
if str.startswith(letter):
result.add(str)
return result
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