Question

我有一个文本文件，其中包含以下内容：

joe satriani is god 
steve vai is god
steve morse is god
steve lukather is god

我想用python编写代码，这将更改文件行，例如：

joe satriani is god ,absolutely man ..
steve vai is god,absolutely man ..
steve morse is god,absolutely man ..
steve lukather is god,absolutely man ..

我曾经尝试过这样做一次，但没有得到理想的结果。因此，首先，我尝试编写代码，该代码只会在第一行的末尾附加“绝对是男人”。

因此，以下是我的代码：

jj = open('readwrite.txt', 'r+')

jj.seek(1)
n = jj.read()
print(" yiuiuiuoioio \n") #just for debugging
print(n)

f = n.split("\n" , n.count("\n")) #to see what I am getting
print(f)   #As it turns out read returns the whole content as a string
print(len(f[0])) # just for debugging
jj.seek(len(f[0])) #take it to the end of first line
posy = jj.tell() # to see if it actually takes it 
print(posy)
jj.write(" Absolutely ..man ")

但是在执行代码时，我的文件更改为以下内容：

joe satriani is god Absolutely ..man d
steve morse is god
steve lukather is god

第二行被覆盖。如何在一行的末尾追加到一个字符串？

我想到了以读取和追加模式打开文件，但是它将覆盖现有文件。我不想从此文件中读取字符串，并通过追加将其写入另一个文件。如何添加或更改文件的行？

有没有包装的方法吗？

Answer 1

这是您要写入同一文件的解决方案

  file_lines = []
    with open('test.txt', 'r') as file:
        for line in file.read().split('\n'):
            file_lines.append(line+ ", absolutely man ..")
    with open('test.txt', 'w') as file:
        for i in file_lines:
            file.write(i+'\n')

这是您要写入其他文件的解决方案

with open('test.txt', 'r') as file:
    for line in file.read().split('\n'):
        with open('test2.txt', 'a') as second_file:
            second_file.write(line+ ", absolutely man ..\n")

Answer 2

given_str = 'absolutely man ..'
text = ''.join([x[:-1]+given_str+x[-1] for x in open('file.txt')])
with open('file.txt', 'w') as file:
    file.write(text)

Answer 3

试图用寻求来写点东西。您只是重写而不是插入，因此在写完文本后必须复制文件的结尾

jj = open('readwrite.txt', 'r+')
data = jj.read()

r_ptr = 0
w_ptr = 0
append_text = " Absolutely ..man \n"
len_append = len(append_text)
for line in data.split("\n"): #to see what I am getting
    r_ptr += len(line)+1
    w_ptr += len(line)
    jj.seek(w_ptr)
    jj.write(append_text+data[r_ptr:])
    w_ptr += len_append

写入以读写模式打开的文件，更改结构

3 个答案: