這個程序有什麼問題？爲什麼數字和totalLength 0？

Question

爲什麼數字和總長度仍然是0？我究竟做錯了什麼。它應該到期行聲明已經改爲線路

def cleanedup(s): 
    alphabet= 'abcdefghijklmnopqrstuvwxyz' 
    cleantext = '' 
    for character in s.lower(): 
     if character in alphabet: 
      cleantext += character 
    else: 
      cleantext = ' ' 
    return cleantext 

import shelve 

shelf = shelve.open('books') 
lines = shelf['Pride and Prejudice'] 
shelf.close() 

number = 0 
totalLength = 0 

for line in lines: 
    for word in cleanedup(line).split(): 
     number += 1 
     totalLength += len(word) 

print(totalLength, number) 

Answer 1

這是主要的問題，你的腳本：

 for character in s.lower(): 
      ... 
     else: 
      cleantext = ' ' 

我不知道這是爲else正確的位置，你的情況你已經把它放在for循環之後，所以cleantext將被重置每次你運行這個函數時因爲你的for循環裏面沒有break聲明。 More info on for ... else ...

---

雖然這可能不是你想要的（問題是有點不清楚），下面的代碼工作：

def cleanedup(s): 
    alphabet= 'abcdefghijklmnopqrstuvwxyz' 
    cleantext = '' 
    for character in s.lower(): 
     if character in alphabet: 
      cleantext += character 
    return cleantext 


lines = ['lorem ipsum dolor sin amet', 'foo bar'] 

number = 0 
totalLength = 0 
for line in lines: 
    for word in cleanedup(line).split(): 
     number += 1 
     totalLength += len(word) 

print(totalLength, number) 

輸出：

>>> 28 2 # 28 = total number of characters, 2 = total number of lines 

---

PS：下一次，提供一個更簡潔的示例來演示問題，而不是使用外部文件。