UnicodeDecodeError: 'ascii' codec can't decode byte 0xe8 in position 11: ordinal not in range

本文记录了解决在使用yum安装mysql-devel过程中遇到的错误经历。最初错误提示为UnicodeDecodeError,通过清理/tmp和/var/log文件释放根目录空间后问题得到解决,并顺利完成安装。

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在安装yum install mysql-devel的时候报yum的错误。
Loaded plugins: fastestmirror, security
Traceback (most recent call last):
  File "/usr/bin/yum", line 29, in <module>
    yummain.user_main(sys.argv[1:], exit_code=True)
  File "/usr/share/yum-cli/yummain.py", line 285, in user_main
    errcode = main(args)
  File "/usr/share/yum-cli/yummain.py", line 114, in main
    base.doLock()
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 1791, in doLock
    while not self._lock(lockfile, mypid, 0644):
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 1857, in _lock
    errmsg = _('Could not create lock at %s: %s ') % (filename, str(msg))
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe8 in position 11: ordinal not in range(128)
[root@ZGBKY-TX287-Server01 liugao]# yum clean all
Loaded plugins: fastestmirror, security
Traceback (most recent call last):
  File "/usr/bin/yum", line 29, in <module>
    yummain.user_main(sys.argv[1:], exit_code=True)
  File "/usr/share/yum-cli/yummain.py", line 285, in user_main
    errcode = main(args)
  File "/usr/share/yum-cli/yummain.py", line 114, in main
    base.doLock()
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 1791, in doLock
    while not self._lock(lockfile, mypid, 0644):
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 1857, in _lock
    errmsg = _('Could not create lock at %s: %s ') % (filename, str(msg))
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe8 in position 11: ordinal not in range(128)


一直以为是yum 安装出问题,其实是/根目录没有空间了。。。

清除/tmp /var/log 等根目录的空间。再次安装,成功。。。。



[root@ZGBKY-TX287-Server01 Build]# yum install mysql-devel
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
Setting up Install Process
Resolving Dependencies
There are unfinished transactions remaining. You might consider running yum-complete-transaction first to finish them.
--> Running transaction check
---> Package mysql-devel.x86_64 0:5.1.73-7.el6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

=============================================================================================================================================================================================
 Package                                         Arch                                       Version                                             Repository                              Size
=============================================================================================================================================================================================
Installing:
 mysql-devel                                     x86_64                                     5.1.73-7.el6                                        os                                     130 k

Transaction Summary
=============================================================================================================================================================================================
Install       1 Package(s)

Total size: 130 k
Installed size: 388 k
Is this ok [y/N]: y
Downloading Packages:
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Warning: RPMDB altered outside of yum.
** Found 7 pre-existing rpmdb problem(s), 'yum check' output follows:
e2fsprogs-libs-1.41.12-22.el6.x86_64 is a duplicate with e2fsprogs-libs-1.41.12-12.el6.x86_64
keyutils-libs-1.4-5.el6.x86_64 is a duplicate with keyutils-libs-1.4-4.el6.x86_64
krb5-libs-1.10.3-57.el6.x86_64 is a duplicate with krb5-libs-1.9-33.el6.x86_64
libcom_err-1.41.12-22.el6.x86_64 is a duplicate with libcom_err-1.41.12-12.el6.x86_64
libselinux-2.0.94-7.el6.x86_64 is a duplicate with libselinux-2.0.94-5.3.el6.x86_64
libss-1.41.12-22.el6.x86_64 is a duplicate with libss-1.41.12-12.el6.x86_64
openssl-1.0.1e-48.el6_8.1.x86_64 is a duplicate with openssl-1.0.1e-30.el6_6.4.x86_64
  Installing : mysql-devel-5.1.73-7.el6.x86_64                                                                                                                                           1/1 
  Verifying  : mysql-devel-5.1.73-7.el6.x86_64                                                                                                                                           1/1 

Installed:
  mysql-devel.x86_64 0:5.1.73-7.el6                                                                                                                                                          

Complete!



### 解决方案 `UnicodeDecodeError: 'ascii' codec can't decode byte` 是 Python 中常见的编码错误之一,通常发生在尝试将非 ASCII 字符串解码为字符串时。以下是详细的解决方案: #### 1. **理解错误的原因** 该错误表明程序试图使用默认的 `ASCII` 编码来解码某些数据,而这些数据包含了超出 ASCII 范围 (0-127) 的字节[^1]。例如,在处理包含特殊字符(如汉字、法语重音字母等)的数据时,如果未指定正确的编码方式,则会触发此错误。 #### 2. **明确输入数据的实际编码格式** 在大多数情况下,现代文本文件可能采用 UTF-8 或其他更复杂的编码形式存储。因此,第一步应确认源数据的真实编码类型。可以借助工具库检测文件编码,比如 `chardet` 库: ```python import chardet with open('file.txt', 'rb') as f: raw_data = f.read() result = chardet.detect(raw_data) encoding = result['encoding'] print(f"The detected encoding is {encoding}.") ``` #### 3. **修改读取操作以匹配实际编码** 一旦明确了目标文件的具体编码标准之后,需调整代码逻辑使其按照相应的方式打开并解析文档内容。下面展示了一个例子,假设已知文件是以 UTF-8 形式保存的: ```python with open('file.txt', 'r', encoding='utf-8') as file: content = file.read() print(content) ``` 通过显式声明参数 `encoding='utf-8'`, 可有效规避因隐含假定而导致的异常状况发生[^2]. #### 4. **设置全局环境变量控制默认行为** 对于那些频繁遭遇此类难题的应用场景而言, 更加彻底的办法可能是重新定义整个运行期内的缺省设定值。这可以通过配置 PYTHONIOENCODING 来达成目的: ```bash export PYTHONIOENCODING=utf-8 ``` 或者直接嵌入脚本头部作为命令行选项传递给解释器执行: ```python #!/usr/bin/env python -X utf8 ... ``` 如此一来便能统一管理所有交互过程里的文字表现形态[^3]. #### 5. **捕获异常并妥善处置** 即便采取了预防措施仍有可能遗漏个别情况下的兼容性考量;为此建议加入 try-except 结构以便及时响应意外情形的发生。 ```python try: with open('file.txt', 'r', encoding='utf-8') as file: content = file.read() except UnicodeDecodeError as e: print(f"Failed to read the file due to decoding error: {e}") finally: pass # Additional cleanup actions here if necessary. ``` 以上方法综合运用能够显著降低乃至完全消除由 `'ascii' codec cannot decode byte` 所引发的一系列连锁反应问题. ---
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