OperatingSystem.current().isWindows -> requirements = listOf("os=windows", "gbt-dogfooding")
                        OperatingSystem.current().isMacOsX -> requirements = listOf("os=macos", "gbt-dogfooding")
                    }
                } else {
                    requirements = listOf("gbt-dogfooding")
                }
            }
        }

That will create a directory `./env/` with the Python binaries, and then you will be able to install packages for that local environment.

### Activate the environment

Activate the new environment with:

=== "Linux, macOS"

    <div class="termy">

    ```console
    $ source ./env/bin/activate
    ```

    </div>

=== "Windows PowerShell"

    <div class="termy">

    ```console

Your code needs to run on [all versions of Java that Gradle supports](platforms/documentation/docs/src/docs/userguide/releases/compatibility.adoc) and across all supported operating systems (macOS, Windows, Linux). The [Gradle CI system](http://builds.gradle.org/) will verify this, but here are some pointers that will avoid surprises:

# ==============================================================================
# Sourcing this enables local disk cache
if [[ $(uname -s) == "Darwin" ]]; then
  echo "Please note that using disk cache on macOS is not recommended because the"
  echo "cache can end up being pretty big and make the build process inefficient."
fi

# ---
*.sw[nop]

# Emacs
# -----
*~
\#*\#
.\#*

# Textmate
# --------
.textmate

# Sublime Text
# ------------
*.sublime-*

# jEnv
# ----
.java-version

# macOS
# ----
.DS_Store

# HPROF
# -----
*.hprof

# Work dirs
# ---------
/incoming-distributions
/intTestHomeDir

# Logs
# ----
/*.log

# Thread dumps for troubleshooting

                ) {
                    eachFile {
                        // Remove top folder when unzipping, that way we get rid of Android Studio.app folder that can cause issues on Mac
                        // where MacOS would kill the Android Studio process right after start, issue: https://github.com/gradle/gradle-profiler/issues/469
                        relativePath = RelativePath(true, *relativePath.segments.drop(1).toTypedArray())

  val safari12iOS = sslLabsClients.first { it.userAgent == "Safari" && it.platform == "iOS 12.3.1" }
  val safari12Osx =
    sslLabsClients.first { it.userAgent == "Safari" && it.platform == "MacOS 10.14.6 Beta" }

  val okhttp = currentOkHttp(ianaSuitesNew)

  val okHttp_4_10 = historicOkHttp("4.10")
  val okHttp_3_14 = historicOkHttp("3.14")
  val okHttp_3_13 = historicOkHttp("3.13")

You can create and use environment variables in the shell, without needing Python:

=== "Linux, macOS, Windows Bash"

    <div class="termy">

    ```console
    // You could create an env var MY_NAME with
    $ export MY_NAME="Wade Wilson"

    // Then you could use it with other programs, like

GuB,KAAAA,KAAMlB,IAAAA,cAAcA,IAAWkB,KAD7B,CAAAvB,ECAT,aAA2D,KAIpD,GAHCwB,+BAGD,CAFCC,EAAYzL,EAAS0L,MAAT1L,CAAgB,CAAhBA,EAAmB2L,WAAnB3L,GAAmCA,EAASiK,KAATjK,CAAe,CAAfA,CAEhD,CAAI4L,EAAI,EAAGA,EAAIJ,EAASvD,OAAQ2D,IAAK,IAClCC,GAASL,KACTM,EAAUD,QAAAA,MAC4B,WAAxC,QAAOzL,UAASC,IAATD,CAAc2L,KAAd3L,mBAIN,MCVT,YAAkC,aAC3BoK,MAAMC,eAGPuB,EAAkB,KAAKhC,SAAvBgC,CAAkC,YAAlCA,SACGlF,OAAOmF,gBAAgB,oBACvBnF,OAAOiF,MAAMd,SAAW,QACxBnE,OAAOiF,MAAM1I,IAAM,QACnByD,OAAOiF,MAAMxI,KAAO,QACpBuD,OAAOiF,MAAMvI,MAAQ,QACrBsD...

因此，通常会将它们提供为由应用程序读取的环境变量。

## 环境变量

!!! tip
    如果您已经知道什么是"环境变量"以及如何使用它们，请随意跳到下面的下一节。

环境变量（也称为"env var"）是一种存在于 Python 代码之外、存在于操作系统中的变量，可以被您的 Python 代码（或其他程序）读取。

您可以在 shell 中创建和使用环境变量，而无需使用 Python：

=== "Linux、macOS、Windows Bash"

    <div class="termy">

    ```console
    // 您可以创建一个名为 MY_NAME 的环境变量
    $ export MY_NAME="Wade Wilson"

    // 然后您可以与其他程序一起使用它，例如
    $ echo "Hello $MY_NAME"

    Hello Wade Wilson