的Python - AttributeError的： 'NoneType' 對象有沒有屬性 '組'

Question

我有以下Python代碼：

import re 

terms = {} 
numbers = {} 

meshFile = 'file.bin' 
with open(meshFile, mode='rb') as file: 
    mesh = file.readlines() 

outputFile = open('mesh.txt', 'w') 

for line in mesh: 
    meshTerm = re.search(b'MH = (.+)$', line) 
    term = meshTerm.group(1) 
    meshNumber = re.search(b'MN = (.+)$', line) 
    number = meshNumber.group(1) 
    numbers[str(number)] = term 
    if terms.has_key(term): 
     terms[term] = terms[term] + ' ' + str(number) 
    else: 
     terms[term] = str(number) 

print(terms) 

當我運行代碼，我收到以下錯誤：

Traceback (most recent call last): 
    File "myFile.py", line 14, in <module> 
    term = meshTerm.group(1) 
AttributeError: 'NoneType' object has no attribute 'group' 

我該如何解決這個問題？

謝謝。

Answer 1

該錯誤告訴您沒有匹配的組。打印您的line變量，然後將其傳遞到re.search，並檢查meshNumber是否爲None。

Answer 2

當你在做meshTerm = re.search(b'MH = (.+)$', line)這個。這裏返回None。它應該是正則表達式對象。