如何替換特定行中以「關鍵字」開頭的特定字python

我試圖編寫python代碼來執行以下操作，並且卡住了。請幫忙。如何替換特定行中以「關鍵字」開頭的特定字python

我有這個文件「names.txt中」

 
rainbow like to play football 

however rainbow ... etc 

names = rainbow, john, alex 

rainbow sdlsdmclscmlsmcldsc.

我需要在開頭線來代替彩虹字（刪除）「NAME =」

我需要的代碼搜索關鍵字「name =」並在同一行中將單詞「rainbow」替換爲「（Removed）」，而不更改其他行中的彩虹字樣，然後覆蓋文件「names.txt」並將其更改爲：

 
rainbow like to play football 

however rainbow ... etc 

names = (Removed), john, alex 

rainbow sdlsdmclscmlsmcldsc.

感謝

來源

2017-01-04 rainbow

向我們展示了代碼，並且您在檢查'name ='或'names =' – depperm

歡迎來到Stack Overflow！您可以先參加[tour]（http://stackoverflow.com/tour）並學習[如何提出一個好問題]（http://stackoverflow.com/help/how-to-ask）並創建一個[最小，完整和可驗證]（http://stackoverflow.com/help/mcve）示例。我們會更容易幫助你。並請檢查你的語法。 – MrLeeh

避免正則表達式，在這裏是做

with open("names.txt") as f: 
    content = f.readlines()

這在How do I read a file line-by-line into a list?規定和使用谷歌搜索「的文件中的巨蟒閱讀棧溢出最好的方式」被發現的一種方式。然後採取這些內容，並執行以下操作。

new_list_full_of_lines = [] # This is what you are going to store your corrected list with 
for linea in content: # This is looping through every line 
    if "names =" in linea: 
    linea.replace ("rainbow", "(Removed)") # This corrects the line if it needs to be corrected - i.e. if the line contanes "names =" at any point 
    new_list_full_of_lines.append(linea) # This saves the line to the new list 
with open('names.txt', 'w') as f: # This will write over the file 
    for item in new_list_full_of_lines: # This will loop through each line 
    f.write("%s\n" % item) # This will ensure that there is a line space between each line.

參考 - String replace doesn't appear to be working

其他參考 - Writing a list to a file with Python

來源

2017-01-04 16:10:18

這將在兩個Python 2.7版（你作爲一個標籤）和Python 3

import fileinput 
import sys 

for line in fileinput.input("names.txt", inplace=1): 
    if "names = " in line: 
     line = line.replace("rainbow", "(Removed)") 
    sys.stdout.write(line)

看做工「可選就地過濾「here（Python 2.7.13）或here（Python 3.6）。

來源

2017-01-04 16:29:37

'if'條件弱。 –

這是要求提出的問題。沒有進一步的澄清，這是最好的可以做到的。 –

如何替換特定行中以「關鍵字」開頭的特定字python

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