Python 在文件中每个句子的末尾写一段文字

Question

f=open('file.txt', 'a', 
encoding='utf-8')
f.write('+1/n')
f.write('+2/n')


f.close()

在file.txt中，结果是

Line 1
Line 2
+1
+2

我想要这个

Line 1+1
Line 2+2

如何在每个句子的末尾写一段文字？

Answer 1

您可以打开文件并阅读带有readlines() 的行。然后回到开头并写下你添加的行。比如：

with open(path,'r+') as f:
    lines = f.readlines()
    f.seek(0)
    for i, line in enumerate(map(str.strip, lines)):
        f.write(f'{line}+{i+1}\n')

Answer 2

试试这个：

with open('file.txt','r', encoding='utf-8') as fr:
    lines = fr.readlines()

with open('file.txt','w', encoding='utf-8') as fw:
    for i,l in enumerate(lines):
        fw.write(f"l+{i+1}\n")

Answer 3

原始文本文件：

line 1
line 2
line 3
line 4

代码：

with open("file.txt", "r") as f:
    lines = f.readlines()
    with open("file.txt", "w") as out_f:
        for i, j in enumerate(lines):  # i represents the index of the line starting at 0. j represents the line itself
            out_f.write(j.strip("\n") + f"+{i + 1}\n")

输出后的文件：

line 1+1
line 2+2
line 3+3
line 4+4