windows 用于检查 Python 是否安装的批处理文件
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batch file to check if Python is installed
提问by fixxxer
I've written a batch script that checks if Python is installed, if it's not installed - it initiates the Python installer contained in the same folder as itself.
我编写了一个批处理脚本，用于检查 Python 是否已安装，如果未安装 - 它会启动包含在与其自身相同的文件夹中的 Python 安装程序。
I'm using the following code:
我正在使用以下代码：
reg query "hkcu\software\Python 2.6"
if ERRORLEVEL 1 GOTO NOPYTHON
:NOPYTHON
ActivePython-2.6.4.8-win32-x86.msi
reg query "hklm\SOFTWARE\ActiveState\ActivePerl\" 1>>Output_%date%_%time%.log 2>&1
if ERRORLEVEL 1 GOTO NOPERL
reg query "hklm\SOFTWARE\Gtk+"
if ERRORLEVEL 1 GOTO NOPYGTK
:NOPERL
ActivePerl-5.10.1.1006-MSWin32-x86-291086.msi 1>>Output_%date%_%time%.log 2>&1
:NOPYGTK
pygtk_windows_installer.exe
But in some cases the installer starts up even if Python is installed. What is the problem here?
但在某些情况下，即使安装了 Python，安装程序也会启动。这里有什么问题？
回答by drej
For those who just want a simple check if Python is installed and can be executed without going into the registy, in your batch file:
对于那些只想简单检查 Python 是否已安装并且无需进入注册表即可在批处理文件中执行的人：
:: Check for Python Installation
python --version 2>NUL
if errorlevel 1 goto errorNoPython
:: Reaching here means Python is installed.
:: Execute stuff...
:: Once done, exit the batch file -- skips executing the errorNoPython section
goto:eof
:errorNoPython
echo.
echo Error^: Python not installed
回答by vonPryz
Your code doesn't branch after the registry query is done. No matter what the first if ERRORLEVELevaluates to, the next step is always to step into the :NOPYTHONlabel.
注册表查询完成后，您的代码不会分支。不管第一个if ERRORLEVEL评估结果如何，下一步总是进入:NOPYTHON标签。
Ed: Here is an example how to make it work. The idea is to add another goto statement which will skip the :NOPYTHONlabel if desired.
Ed：这是一个如何让它工作的例子。这个想法是添加另一个 goto 语句，:NOPYTHON如果需要，它将跳过标签。
reg query "hkcu\software\Python 2.6"
if ERRORLEVEL 1 GOTO NOPYTHON
goto :HASPYTHON
:NOPYTHON
ActivePython-2.6.4.8-win32-x86.msi
:HASPYTHON
reg query "hklm\SOFTWARE\ActiveState\ActivePerl\" 1>>Output_%date%_%time%.log 2>&1
回答by Ste
Here's my method.
这是我的方法。
The python -Vcommand will return the version number and the find command with the aid of the /vswitch will search for the omittance of Pythonand there's also a normal one without that switch.
该python -V命令将返回版本号，而借助/v开关的 find 命令将搜索 的省略号，Python也有一个没有该开关的正常版本。
@echo off & title %~nx0 & color 5F
goto :DOES_PYTHON_EXIST
:DOES_PYTHON_EXIST
python -V | find /v "Python" >NUL 2>NUL && (goto :PYTHON_DOES_NOT_EXIST)
python -V | find "Python" >NUL 2>NUL && (goto :PYTHON_DOES_EXIST)
goto :EOF
:PYTHON_DOES_NOT_EXIST
echo Python is not installed on your system.
echo Now opeing the download URL.
start "" "https://www.python.org/downloads/windows/"
goto :EOF
:PYTHON_DOES_EXIST
:: This will retrieve Python 3.8.0 for example.
for /f "delims=" %%V in ('python -V') do @set ver=%%V
echo Congrats, %ver% is installed...
goto :EOF
