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Idiom #205 Get an environment variable

Read an environment variable with the name "FOO" and assign it to the string variable foo. If it does not exist or if the system does not support environment variables, assign a value of "none".

import os
try:
    foo = os.environ['FOO']
except KeyError:
    foo = "none"
import os
foo = os.environ.get('FOO', 'none')
from os import getenv
foo = getenv('FOO', 'none')
#include <stdlib.h>
const char * foo = getenv("FOO");
if (foo == NULL) foo = "none";
#include <cstdlib>
#include <string>
const char* tmp = std::getenv("FOO");
std::string foo = tmp ? std::string(tmp) : "none";
string foo = Environment.GetEnvironmentVariable("FOO");
if (string.IsNullOrEmpty(foo)) foo = "none";
foo = System.get_env("FOO", "none")
Foo = os:getenv("FOO","none").
  call get_environment_variable ("FOO", length=n, status=st)
  if (st /= 0) then
    foo = "none"
  else
    allocate (character(len=n) :: foo)
    call get_environment_variable ("FOO", value=foo)
  end if 
import "os"
foo, ok := os.LookupEnv("FOO")
if !ok {
	foo = "none"
}
import "os"
foo := os.Getenv("FOO")
if foo == "" {
	foo = "none"
}
def foo = System.getenv('FOO') ?: 'none'
const foo = process.env["FOO"] || "none";
String foo = System.getenv("foo");
if (foo == null) {
	foo = "none";
}
$foo = getenv("FOO") ?: "none";
sysutils
var
  foo: string;
begin
  foo := GetEnvironmentVariable('FOO');
  if (foo = '') then foo := 'none';
end.
use 5.010;
my $foo = $ENV{FOO} // 'none';
foo = ENV["FOO"]
use std::env;
let foo;
match env::var("FOO") {
    Ok(val) => foo = val,
    Err(_e) => foo = "none".to_string(),
}
let foo = env::var("FOO").unwrap_or("none".to_string());
use std::env;
let foo = match env::var("FOO") {
    Ok(val) => val,
    Err(_e) => "none".to_string(),
};
imports System
Dim _foo as String
Try
	foo = Environment.GetEnvironmentVariable("FOO")
Catch ex as Exception
	foo = "none"
End Try

New implementation...
tkoenig