[英]Insert text into a text file following specific text using Python
我必須編輯一些文本文件以包含新信息,但我需要根據周圍的文本在文件中的特定位置插入該信息。
這不是我需要它的方式:
with open(full_filename, "r+") as f:
lines = f.readlines()
for line in lines:
if 'identifying text' in line:
offset = f.tell()
f.seek(offset)
f.write('Inserted text')
...因為它將文本添加到文件的末尾。 如何將其寫入識別文本后的下一行?
(AFAICT,這不是類似問題的重復,因為沒有一個能夠提供這個答案)
如果您不需要在適當的地方工作,那么可能是這樣的:
with open("old.txt") as f_old, open("new.txt", "w") as f_new:
for line in f_old:
f_new.write(line)
if 'identifier' in line:
f_new.write("extra stuff\n")
(或者,兼容Python-2.5):
f_old = open("old.txt")
f_new = open("new.txt", "w")
for line in f_old:
f_new.write(line)
if 'identifier' in line:
f_new.write("extra stuff\n")
f_old.close()
f_new.close()
轉過來
>>> !cat old.txt
a
b
c
d identifier
e
成
>>> !cat new.txt
a
b
c
d identifier
extra stuff
e
(關於在'string2'中使用'string1'的常見警告:'enamel'中'name'為True,''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
您可以使用正則表達式,然后替換文本。
import re
c = "This is a file's contents, apparently you want to insert text"
re.sub('text', 'text here', c)
print c
返回“這是文件的內容,顯然你想在這里插入文字”
不確定它是否適用於您的用例但如果它適合它就很好而且簡單。
這將在文件中查找任何字符串(不具體,僅在行的開頭,即也可以存在於多行中)。
通常情況下,你可以遵循算法:
讓我們看看代碼:
#!/usr/bin/python
import os
SEARCH_WORD = 'search_text_here'
file_name = 'sample.txt'
add_text = 'my_new_text_here'
final_loc=-1
with open(file_name, 'rb') as file:
fsize = os.path.getsize(file_name)
bsize = fsize
word_len = len(SEARCH_WORD)
while True:
found = 0
pr = file.read(bsize)
pf = pr.find(SEARCH_WORD)
if pf > -1:
found = 1
pos_dec = file.tell() - (bsize - pf)
file.seek(pos_dec + word_len)
bsize = fsize - file.tell()
if file.tell() < fsize:
seek = file.tell() - word_len + 1
file.seek(seek)
if 1==found:
final_loc = seek
print "loc: "+str(final_loc)
else:
break
# create file with doxygen comments
f_old = open(file_name,'r+')
f_new = open("new.txt", "w")
f_old.seek(0)
fStr = str(f_old.read())
f_new.write(fStr[:final_loc-1]);
f_new.write(add_text);
f_new.write(fStr[final_loc-1:])
f_new.close()
f_old.close()
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.