[英]Search for Word in Text file and replace with value from dictionary, only once
[英]search for a word in file and replace it with the corresponding value from dictionary in python
我想從某個文件中搜索一個單詞,然后用與關鍵字詞典不同的字符串替換該單詞。 基本上,這只是文本替換。
我的以下代碼不起作用:
keyword = {
"shortkey":"longer sentence",
"gm":"goodmorning",
"etc":"etcetera"
}
with open('find.txt', 'r') as file:
lines = file.readlines()
for line in lines:
if re.search(keyword.keys(), line):
file.write(line.replace(keyword.keys(), keyword.values()))
break
我寫print
時的錯誤消息:
Traceback (most recent call last):
File "py.py", line 42, in <module>
if re.search(keyword.keys(), line):
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/re.py", line 146, in search
return _compile(pattern, flags).search(string)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/re.py", line 237, in _compile
p, loc = _cache[cachekey]
TypeError: unhashable type: 'list'
就地編輯文件很臟; 您最好寫一個新文件,然后再替換舊文件。
您正在嘗試將列表用作正則表達式,這是無效的。 我不確定為什么首先要使用正則表達式,因為這不是必需的。 您也不能將列表傳遞到str.replace
。
您可以遍歷關鍵字列表,並對照字符串檢查每個關鍵字。
keyword = {
"shortkey": "longer sentence",
"gm": "goodmorning",
"etc": "etcetera"
}
with open('find.txt', 'r') as file, open('find.txt.new', 'w+') as newfile:
for line in file:
for word, replacement in keyword.items():
newfile.write(line.replace(word, replacement))
# Replace your old file afterwards with the new one
import os
os.rename('find.txt.new', 'find.txt')
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