[英]Writing to the previous line of a txt file in Python 3.3
I have a .txt with alternating names and numbers (the numbers ordered from lowest to highest). 我有一个.txt,其中包含交替的名称和数字(数字从最低到最高排序)。 I then have 2 variables, an integer and a name.
然后,我有2个变量,一个整数和一个名称。 I want to search the .txt for the 1st number that is >= to my integer variable and then I want to write my integer and name above the found number (I need them on a new line, and each variable on a separate line).
我想在.txt中搜索第一个数字,该数字> =我的整数变量,然后我将我的整数和名称写在找到的数字之上(我需要在新行中将它们和每个变量都在单独的行中) 。
This is what I have so far: 这是我到目前为止的内容:
import re
new_num = 456
new_data = str(new_num) + '\n' + 'Georph'
written = False
with open('line_search.txt','r+') as f:
data = f.readlines()
for i, line in enumerate(data):
number = (re.findall("\d+", line))
if number:
if new_num <= int(number[0]):
while written == False:
written = True
print(number[0])
print("print 2 lines right before this line")
f.writelines(new_data)
And this is the test .txt being searched: 这是正在搜索的测试.txt:
65
Munkshunk
164
Nimaman
649
Tila
891
Mugshoe
Which I want to end up looking like this: 我想要最终看起来像这样:
65
Munkshunk
164
Nimaman
456
Georph
649
Tila
891
Mugshoe
But so far the script only appends my 2 variables to the end of the .txt , how do I make it insert it the line before the found variable? 但是到目前为止,脚本仅将我的2个变量附加到.txt的末尾 ,如何使它在找到的变量之前插入它?
If memory consumption and time is not a problem the easiest is to read all data from file, change data and overwrite file with new data: 如果内存消耗和时间不是问题,最简单的方法就是从文件中读取所有数据,更改数据并用新数据覆盖文件:
import re
new_num = 456
new_data = str(new_num) + '\n' + 'Georph\n'
written = False
with open('line_search.txt','r') as f:
data = f.readlines()
updated_data = []
for i, line in enumerate(data):
if re.match("\d+", line):
if new_num <= int(line):
updated_data = data[:i] + [new_data] + data[i:]
break
with open('line_search.txt', 'w') as f:
f.writelines(updated_data)
For anyone who wants to use the fileinput
method, here is what I came up with: 对于任何想使用
fileinput
方法的人,这是我想出的:
import re
import fileinput
new_num = 456
new_data = str(new_num) + '\n' + 'Georph'
written = False
for line in fileinput.input('line_search.txt', inplace=1):
number = (re.findall("\d+", line))
if number:
if new_num <= int(number[0]):
while written == False:
written = True
print(new_data)
print(line.strip('\n')) #without the .strip('\n') the file get's re-written for some reason with a '\n' between every single line in the document.
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