Python的應用re.sub工作不正常

試圖讓Python中的 'sed的替換' 功能工作Python的應用re.sub工作不正常

我有什麼現在

def pysed(filename,search,replace):  
    for line in fileinput.input(filename,inplace=True): 
     sys.stdout.write(re.sub(r'{0}','{1}',line.format(search,replace)))

調用函數...

pysed('/dev/shm/FOOD_DES.txt','Butter','NEVER')

文件/dev/shm/FOOD_DES.txt包含以下內容....

~01001~^~0100~^~Butter, salted~^~BUTTER,WITH SALT~^~~^~~^~Y~^~~^0^~~^6.38^4.27^8.79^3.87 
~01002~^~0100~^~Butter, whipped, with salt~^~BUTTER,WHIPPED,WITH  SALT~^~~^~~^~Y~^~~^0^~~^6.38^4.27^8.79^3.87 
~01003~^~0100~^~Butter oil, anhydrous~^~BUTTER OIL,ANHYDROUS~^~~^~~^~Y~^~~^0^~~^6.38^4.27^8.79^3.87 
~01004~^~0100~^~Cheese, blue~^~CHEESE,BLUE~^~~^~~^~Y~^~~^0^~~^6.38^4.27^8.79^3.87 
~01005~^~0100~^~Cheese, brick~^~CHEESE,BRICK~^~~^~~^~Y~^~~^0^~~^6.38^4.27^8.79^3.87 
~01006~^~0100~^~Cheese, brie~^~CHEESE,BRIE~^~~^~~^~Y~^~~^0^~~^6.38^4.27^8.79^3.87 
~01007~^~0100~^~Cheese, camembert~^~CHEESE,CAMEMBERT~^~~^~~^~Y~^~~^0^~~^6.38^4.27^8.79^3.87 
~01008~^~0100~^~Cheese, caraway~^~CHEESE,CARAWAY~^~~^~~^~~^~~^0^~~^6.38^4.27^8.79^3.87 
~01009~^~0100~^~Cheese, cheddar~^~CHEESE,CHEDDAR~^~~^~~^~Y~^~~^0^~~^6.38^4.27^8.79^3.87 
~01010~^~0100~^~Cheese, cheshire~^~CHEESE,CHESHIRE~^~~^~~^~~^~~^0^~~^6.38^4.27^8.79^3.87

但是，當運行這個時，我收到以下錯誤。任何想法，想法？

pysed('/dev/shm/FOOD_DES.txt','Butter','NEVER')  
Traceback (most recent call last): 
    File "<stdin>", line 1, in <module> 
    File "<stdin>", line 3, in pysed 
    File "/usr/lib64/python2.6/re.py", line 151, in sub 
    return _compile(pattern, 0).sub(repl, string, count) 
    File "/usr/lib64/python2.6/re.py", line 245, in _compile 
    raise error, v # invalid expression

來源

2012-10-02 user1601716

究竟是正則表達式應該是在你的榜樣電話嗎？因爲據我所見，你總是使用正則表達式'{0}'，這顯然是無效的。 – millimoose

您寫道：

sys.stdout.write(re.sub(r'{0}','{1}',line.format(search,replace)))

這是相當混亂。這是你的意思寫嗎？

sys.stdout.write(re.sub('{0}'.format(search), '{0}'.format(replace), line))

這當然會等同於：

sys.stdout.write(re.sub(search, replace, line))

來源

2012-10-02 01:30:01

大壩，讓我覺得很愚蠢的方式：D，但是完美的工作，謝謝 – user1601716

Python的應用re.sub工作不正常

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