Fatal Python error: initfsencoding: unable to load the file system codec

When both Python 2 and Python 3 exist and one of them fails to start, an error is reported in one of two cases
 
1. File error in python2 path failed to start python3

Fatal Python error: initfsencoding: Unable to load the file system codec
file “C:\Python27\Lib\encodings\__init__. Py “, line 123
ise CodecRegistryError,\
^>r> syntaxe> : invalid syntax
Current thread 0x000004dc (most recent call first):
2, file error in python3 path failed to start

File “E:\Python37\Lib\site.py”, line 177
File =sys.stderr)

s>xerror: invalid syntax
 
The above two cases in returning the same, the reason is to set the environment variable PYTHONPATH, PYTHONPATH is Python search path, we import the default module will search from the PYTHONPATH, environment variable is set to one version of the module path, lead to another version of the module loading path error when starting, leading to launch failure, this is according to the online tutorial to install Python when leaving a hole, the variable can not actually, The environment variable needs to be configured when the custom module is no longer in the Python installation path, so you can remove this environment variable, or just remove C:\Pythonxx\Lib

Perfect solution after deletion

Lookuperror: unknown encoding: cp65001 when executing Python

Appears during FETCH V8

E:\GitProject\svn_v8>fetch v8
Running: 'E:\GitProject\libcef\depot_tools\python276_bin\python.exe' 'E:\GitProj
ect\libcef\depot_tools\gclient.py' root
Traceback (most recent call last):
  File "E:\GitProject\libcef\depot_tools\\fetch.py", line 353, in <module>
    sys.exit(main())
  File "E:\GitProject\libcef\depot_tools\\fetch.py", line 348, in main
    return run(options, spec, root)
  File "E:\GitProject\libcef\depot_tools\\fetch.py", line 342, in run
    return checkout.init()
  File "E:\GitProject\libcef\depot_tools\\fetch.py", line 134, in init
    self.run_gclient('config', '--spec', self._format_spec())
  File "E:\GitProject\libcef\depot_tools\\fetch.py", line 76, in run_gclient
    return self.run(cmd_prefix + cmd, **kwargs)
  File "E:\GitProject\libcef\depot_tools\\fetch.py", line 63, in run
    print 'Running: %s' % (' '.join(pipes.quote(x) for x in cmd))
LookupError: unknown encoding: cp65001

LookupError: unknown encoding: cp65001
This error can be solved by changing the encoding mode:

chcp 1252

You can also set the default character encoding
HKEY_CURRENT_USER\Console\%SystemRoot%_system32_cmd.exe\CodePage by modifying the registry CodePage value

Unknown code: GB18030

The Linux installation of Python 3.5.2 encountered the following error
Could not find platform dependent libraries < exec_prefix>
Consider setting $PYTHONHOME to < prefix> [:<exec_prefix>]
Fatal Python error: Py_Initialize: Unable to get the locale encoding
LookupError: unknown encoding: GB18030
 
Solution:
Before the web.config
Export LANG= zh_cn.utf-8
export LANGUAGE= zh_cn.utf-8

LookupError: Couldn’t find path to unrar library.

 

LookupError: Couldn’t find path to unrar library.
Mean to find unrar library paths, here we need to download the unrar library, in fact it is unrar. DLL this stuff, download url: http://www.rarlab.com/rar/UnRARDLL.exe or go to http://www.rarlab.com/rar_add.htm to find unrar. DLL download, should the need to compile under lunix.
The second step:
C:\Program Files (x86)\UnrarDLL = C:\Program Files (x86)\UnrarDLL = C:\Program Files (x86)\UnrarDLL = C:\Program Files (x86)\UnrarDLL = C:\Program Files (x86)\UnrarDLL = C:\Program Files (x86)\UnrarDLL = C:\Program Files (x86)\UnrarDLL = C:\Program Files (x86)\UnrarDLL = C:\Program Files (x86)\UnrarDLL = unrar.lib

Reproduced in: https://www.cnblogs.com/sea-stream/p/10329794.html

Lookuperror: couldn’t find path to unrear library! two thousand and twenty

Appear this kind of circumstance, because unrar there is dependent on a file unrar. DLL download address

when the download is complete must be installed in the default folder
then will pop up after the completion of the installation folder,
C:\Program Files (x86)\ Unrardll \x64
br> a>

>

<>bb4

C:\Program Files (x86)\ Unrardll \x64
C:\Program Files (x86)\ Unrardll \x64

Could’t find path to unrear Library

The original link: https://blog.csdn.net/ysy950803/article/details/52939708
Win:

    to RARLab first official download library files, http://www.rarlab.com/rar/UnRARDLL.exe, and installation; The best way to install is to choose the default path, usually in the C: Program Files (x86)\UnrarDLL\ directory; Then the important step is to add the environment variable, this computer (my computer) right click, properties, find advanced system Settings, advanced TAB under the environment variable, in the system variable (note not user variable) new, variable name input UNRAR_LIB_PATH, must be exactly the same, the value of the variable should pay special attention to! If you are a 64-bit system, type C:\Program Files (x86)\ Unrardll \x64\ Unrar64.dll, if you are a 32-bit system, type C:\Program Files (x86)\ Unrard.dll. Once you’re sure to save the environment variables, restart your PyCharm with the same code, and run it error-free. At this point the dependent libraries have been added to the system environment.

Linux needs to manually compile and generate the SO file itself, which is a bit more cumbersome:

    in the same way, the first to download the Source file, but it’s not like a Win for you packaging good, you need to download the Source code: http://www.rarlab.com/rar/unrarsrc-5.4.5.tar.gz, namely RARLab website to download the list of UnRAR Source, you can download the latest version; Make install-lib will automatically compile the library files. After the compilation is complete, use make install-lib to generate the libunrar.so file (normally located under /usr/lib). Finally, you still need to set the environment variable of your Linux system, find the profile file in the /etc/profile directory, which you can edit directly using the Vim /etc/profile command (even easier with WinSCP), add export UNRAR_LIB_PATH=/usr/lib/libunrar.so at the end of the profile, don’t put the comma in it. Save the variable successfully and then use the source /etc/profile command to make the variable effective. This way, if you run the py file again, you won’t get an error, at least you won’t be told that you can’t find the unrar library.

Sudo apt-get install g++ : sudo apt-get install g++ : sudo apt-get install g++ : sudo apt-get install g++ : sudo apt-get install
Source: author: acerola
CSDN
,
https://blog.csdn.net/ysy950803/article/details/52939708 copyright statement: this article original articles for bloggers, reproduced please attach link to blog!

Panda was unable to open the. Xlsx file, xlrd.biffh.XLRDError : Excel xlsx file； not supported

The reason is that XLRD was recently updated to version 2.0.1 and only supports.xls files. So Pandas. Read_Excel (‘ xxx.xlsx ‘) will return an error.
You can install an older version of XLRD and run it in CMD:
PIP uninstall XLRD
PIP install XLRD ==1.2.0
You can also open the.xlsx file with OpenPyXL instead of XLRD:
Df = pandas read_excel (‘ data. XLSX, engine = ‘openpyxl)

PHP connection to MySQL database error: call to undefined function MySQL_ connect()

Problem description
I just started to learn PHP, and the system environment is Ubuntu+PHP7.0+Mysql5.7+Apache2.
running a database connection test sample error:

[client 127.0.0.1:37496] PHP Fatal error:  Uncaught Error: Call to undefined function mysql_connect() in /var/www/html/test.php:2\nStack trace:\n#0 {main}\n  thrown in /var/www/html/test.php on line 2

The sample code is:

<?PHP
    $conn=mysql_connect("localhost","root","root");
    if($conn){
        echo"ok";
    }else{
        echo"error";    
    }
?>

The solution
The mysql_connect() function has been deprecated since PHP5.0. In PHP 7.0 it has been deprecated and replaced with this function:

mysqli_connect();

Usage is:

$con=mysqli_connect("localhost","my_user","my_password","my_db");

The description of the official connection: http://php.net/manual/en/function.mysqli-connect.php
the correct test code:

<?PHP
    $conn=mysqli_connect("localhost","root","root");
    if($conn){
        echo"ok";
    }else{
        echo"error";    
    }
?>

conclusion

    in the Ubuntu + PHP7.0 + Mysql5.7 + Apache2 system under the environment of the wrong, because the mysql_connect () function has been deprecated, when following outdated tutorial learning may encounter this error. (note: if it is a Windows system, are more likely to be Apache2 not enable mysql, details on baidu) when running the above test code, interface without any reaction, the error is in the log to consult, log directory in the/var/log/Apache2/error log “.

SCP error: not a regular file

Linux local files are uploaded to the server
SCP/home/liujia/file. TXT [email protected]:1/user/liujia
Download the file from the server
[email protected]:/user/liujia/file1. TXT/home/liujia

The command
SCP [email protected]:/user/liujia// home/liujia
Cp not a regular file
The reason is that this is the equivalent of downloading folders, not files.
The solution is to add the parameter -r
SCP – r [email protected]:/user/liujia// home/liujia
That’s it