從列表中刪除字符

Question

你好，我有一個列表，列表中的每個項目在開頭都有相同的字符。我如何刪除這些字符。 「SiteName ........................................」

我試過使用result.split（）會引發錯誤。這是到目前爲止我的代碼及以下

createlist = open('ztest12.txt', 'r') 
result = [line.split(',') for line in createlist.readlines()] 
print result 




[['Site Name........................................ Denver\n'], 
['Site Name........................................ DenverOutdoor\n'], 
['Site Name........................................ Dietzenbach\n'], 
['Site Name........................................ EG3\n'], 
['Site Name........................................ Edina\n'], 
['Site Name........................................ Hongkong\n'], 
['Site Name........................................ Honolulu\n'], 
['Site Name........................................ HooneePlace\n'], 
['Site Name........................................ Juarez\n'], 
['Site Name........................................ KansasCity\n'], 
['Site Name........................................ Kent\n'], 
['Site Name........................................ LA\n'], 
['Site Name........................................ Lanham\n'], 
['Site Name........................................ Lebanon\n'], 
['Site Name........................................ Lockbourne\n'], 
['Site Name........................................ London\n'], 
['Site Name........................................ Mesa\n'], 
['Site Name........................................ Minneapolis\n'], 
['Site Name........................................ NewMexico\n'], 
['Site Name........................................ NewYork']] 

Answer 1

輸出就切出來：

with open('ztest12.txt', 'r') as f: 
    result = [line[50:].rstrip() for line in f] 

Answer 2

我看到兩個選項：

• 乾淨的：使用正則表達式

• 又快又髒一個：

  乾淨=行[50：]＃保持所有字符50

Answer 3

使用 「切片」 觀後：

>>> x = "Hello World!" 

>>> x[2:] 

'llo World!' 

>>> x[:2] 

'He' 

希望它能幫助。

Answer 4

你試圖用逗號分割你的字符串，但是其中有沒有逗號。不管怎樣，這是replace工作，不split：

createlist = open('ztest12.txt', 'r') 
result = [ line.replace('Site Name........................................ ', '') for line in createlist ] 

Answer 5

您可以使用str.rsplit()來實現：

>>> data = [['Site Name........................................ Denver\n'], 
['Site Name........................................ DenverOutdoor\n'], 
['Site Name........................................ Dietzenbach\n'], 
['Site Name........................................ EG3\n'], 
['Site Name........................................ Edina\n'], 
['Site Name........................................ Hongkong\n'], 
['Site Name........................................ Honolulu\n'], 
['Site Name........................................ HooneePlace\n'], 
['Site Name........................................ Juarez\n'], 
['Site Name........................................ KansasCity\n'], 
['Site Name........................................ Kent\n'], 
['Site Name........................................ LA\n'], 
['Site Name........................................ Lanham\n'], 
['Site Name........................................ Lebanon\n'], 
['Site Name........................................ Lockbourne\n'], 
['Site Name........................................ London\n'], 
['Site Name........................................ Mesa\n'], 
['Site Name........................................ Minneapolis\n'], 
['Site Name........................................ NewMexico\n'], 
['Site Name........................................ NewYork']] 
>>> 
>>> [[s[0].rsplit('.')[-1]] for s in data] 
[[' Denver\n'], 
[' DenverOutdoor\n'], 
[' Dietzenbach\n'], 
[' EG3\n'], 
[' Edina\n'], 
[' Hongkong\n'], 
[' Honolulu\n'], 
[' HooneePlace\n'], 
[' Juarez\n'], 
[' KansasCity\n'], 
[' Kent\n'], 
[' LA\n'], 
[' Lanham\n'], 
[' Lebanon\n'], 
[' Lockbourne\n'], 
[' London\n'], 
[' Mesa\n'], 
[' Minneapolis\n'], 
[' NewMexico\n'], 
[' NewYork']] 
>>> 

也許更強大的解決方案然而，是使用re.sub()：

>>> from re import sub 
>>> 
>>> [[sub('Site Name\.*', '', s[0])] for s in data] 
[[' Denver\n'], 
[' DenverOutdoor\n'], 
[' Dietzenbach\n'], 
[' EG3\n'], 
[' Edina\n'], 
[' Hongkong\n'], 
[' Honolulu\n'], 
[' HooneePlace\n'], 
[' Juarez\n'], 
[' KansasCity\n'], 
[' Kent\n'], 
[' LA\n'], 
[' Lanham\n'], 
[' Lebanon\n'], 
[' Lockbourne\n'], 
[' London\n'], 
[' Mesa\n'], 
[' Minneapolis\n'], 
[' NewMexico\n'], 
[' NewYork']] 
>>>