【python】从txt中删除指定长度的字符，报错查因【已解决】

zhi_huo

问题：报错查因。 ValueError:list.remove(x): x not in list

情况：从本论坛的悬赏中看到要求：从txt中删除指定长度的字符。

      例如：从：shfsdk2434jfhsdf

              E389EBF0A6AA1CD9C9F976EEB4350F20               

              23423               

              BF9477540C8AA9C6B3131B2723B3C17B

删除长度为32的字符，像BF9477540C8AA9C6B3131B2723B3C17B

于是想用python来解决，写了下列代码，学艺不精，请大佬们指点：

[Python] 纯文本查看 复制代码

filename = 'x.txt'

with open(filename, 'r') as file_object:
    contents = file_object.readlines()
    print(contents)
    
    for content in contents:
        content = content.strip('\n')
        print(content)
        if len(content)==32:
            contents.remove('content')

    print(contents)

具体错误代码：

[PowerShell] 纯文本查看 复制代码

PS C:\Users\ZhiHu\Documents\python_application>  c:; cd 'c:\Users\ZhiHu\Documents\python_application'; & 'C:\Users\ZhiHu\AppData\Local\Programs\Python\Python310\python.exe' 'c:\Users\ZhiHu\.vscode\extensions\ms-python.python-2022.12.0\pythonFiles\lib\python\debugpy\adapter/../..\debugpy\launcher' '55704' '--' 'c:\Users\ZhiHu\Documents\python_application\txt_delete.py' 
['shfsdk2434jfhsdf\n', 'E389EBF0A6AA1CD9C9F976EEB4350F20\n', '23423\n', 'BF9477540C8AA9C6B3131B2723B3C17B']
shfsdk2434jfhsdf
E389EBF0A6AA1CD9C9F976EEB4350F20
Traceback (most recent call last):
  File "C:\Users\ZhiHu\AppData\Local\Programs\Python\Python310\lib\runpy.py", line 196, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "C:\Users\ZhiHu\AppData\Local\Programs\Python\Python310\lib\runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "c:\Users\ZhiHu\.vscode\extensions\ms-python.python-2022.12.0\pythonFiles\lib\python\debugpy\__main__.py", line 39, in <module>
    cli.main()
  File "c:\Users\ZhiHu\.vscode\extensions\ms-python.python-2022.12.0\pythonFiles\lib\python\debugpy/..\debugpy\server\cli.py", line 430, in main    
    run()
  File "c:\Users\ZhiHu\.vscode\extensions\ms-python.python-2022.12.0\pythonFiles\lib\python\debugpy/..\debugpy\server\cli.py", line 284, in run_file    runpy.run_path(target, run_name="__main__")
  File "c:\Users\ZhiHu\.vscode\extensions\ms-python.python-2022.12.0\pythonFiles\lib\python\debugpy\_vendored\pydevd\_pydevd_bundle\pydevd_runpy.py", line 321, in run_path
    return _run_module_code(code, init_globals, run_name,
  File "c:\Users\ZhiHu\.vscode\extensions\ms-python.python-2022.12.0\pythonFiles\lib\python\debugpy\_vendored\pydevd\_pydevd_bundle\pydevd_runpy.py", line 135, in _run_module_code
    _run_code(code, mod_globals, init_globals,
  File "c:\Users\ZhiHu\.vscode\extensions\ms-python.python-2022.12.0\pythonFiles\lib\python\debugpy\_vendored\pydevd\_pydevd_bundle\pydevd_runpy.py", line 124, in _run_code
    exec(code, run_globals)
  File "c:\Users\ZhiHu\Documents\python_application\txt_delete.py", line 11, in <module>
    contents.remove('content')
ValueError: list.remove(x): x not in list

grekevin

contents.remove('content')  
content 引号去掉

grekevin

兄弟使用sublime编辑器 + 正则表达式不必代码快

zhi_huo

grekevin 发表于 2022-8-14 10:43
contents.remove('content')  
content 引号去掉

去掉也不行

[PowerShell] 纯文本查看 复制代码

['shfsdk2434jfhsdf\n', 'E389EBF0A6AA1CD9C9F976EEB4350F20\n', '23423\n', 'BF9477540C8AA9C6B3131B2723B3C17B']
shfsdk2434jfhsdf
E389EBF0A6AA1CD9C9F976EEB4350F20
Traceback (most recent call last):
  File "C:\Users\ZhiHu\Documents\python_application\txt_delete.py", line 11, in <module>
    contents.remove(content)
ValueError: list.remove(x): x not in list

zhi_huo

grekevin 发表于 2022-8-14 10:48
兄弟使用sublime编辑器 + 正则表达式不必代码快

确实快，我想问一下python能不能处理这种问题？

grekevin

zhi_huo 发表于 2022-8-14 10:57
确实快，我想问一下python能不能处理这种问题？

可以
content = content.strip('\n') 这句你把\n去掉了，但是列表内的\n还在，去掉\n的元素肯定不在列表内
知道怎么改了吧

zhi_huo

grekevin 发表于 2022-8-14 11:05
可以
content = content.strip('\n') 这句你把\n去掉了，但是列表内的\n还在，去掉\n的元素肯定不在列表 ...

原来是这里出了问题。

但是我想不出来怎么改。

我不知道怎么去掉\n后，把content写入到contents

grekevin

[Python] 纯文本查看 复制代码

in_file = 'x.txt'
out_file = 'out.txt'


with open(out_file, 'w') as fo:
    with open(in_file, 'r') as fi:
        for line in fi:
            if len(line.strip())==32:
                fo.write(line)

zhi_huo

grekevin 发表于 2022-8-14 11:18
[mw_shl_code=python,true]in_file = 'x.txt'
out_file = 'out.txt'

OK，明白了。如果需要去掉32字符的话，
改成   if len(line.strip())  != 32:
                fo.write(line)

zhi_huo

grekevin 发表于 2022-8-14 11:18
[mw_shl_code=python,true]in_file = 'x.txt'
out_file = 'out.txt'

大佬，能把我看看悬赏贴吗？
https://www.52pojie.cn/thread-1675156-1-1.html