# Змінні оточення { #environment-variables }

/// tip | Порада

Якщо ви вже знаєте, що таке «змінні оточення» і як їх використовувати, можете пропустити цей розділ.

///

Змінна оточення (також відома як «env var») - це змінна, що існує поза кодом Python, в операційній системі, і може бути прочитана вашим кодом Python (а також іншими програмами).

Змінні оточення корисні для роботи з налаштуваннями застосунку, як частина встановлення Python тощо.

# Umgebungsvariablen { #environment-variables }

/// tip | Tipp

Wenn Sie bereits wissen, was „Umgebungsvariablen“ sind und wie man sie verwendet, können Sie dies überspringen.

///

Eine Umgebungsvariable (auch bekannt als „**env var**“) ist eine Variable, die **außerhalb** des Python-Codes im **Betriebssystem** lebt und von Ihrem Python-Code (oder auch von anderen Programmen) gelesen werden kann.

To understand environment variables you can read [Environment Variables](../environment-variables.md).

///

## Types and validation { #types-and-validation }

These environment variables can only handle text strings, as they are external to Python and have to be compatible with other programs and the rest of the system (and even with different operating systems, as Linux, Windows, macOS).

  # The string can then be piped into `source`, to re-set the
  # 'converted' variables.
  print(var_str)


if __name__ == '__main__':
  parser = argparse.ArgumentParser(description=(
      'Convert MSYS paths in environment variables to Windows paths.'))
  parser.add_argument('--blacklist',
                      nargs='*',
                      help='List of variables to ignore')
  parser.add_argument('--whitelist-prefix',

# variables in it, OR may be left empty if the user has already exported the
# relevant variables in their environment. Because of 'set -o allexport' above
# (which is equivalent to "set -a"), every variable in the file is exported
# for other files to use.
#
# Separately, if TFCI is set *and* there are also additional TFCI_ variables

    /**
     * Returns a {@link Map} with type variables as keys and type arguments as values for a parameterized type (class or interface).
     * <p>
     * If the type is not parameterized, an empty {@link Map} is returned.
     * </p>
     *
     * @param beanClass
     *            The parameterized type (class or interface). Must not be {@literal null}.

	)

	ErrMissingEnvCredentialSecretKey = newErrFn(
		"Missing credential environment variable, \""+EnvSecretKey+"\"",
		"Environment variables \""+EnvSecretKey+"\" and \""+EnvAccessKey+"\" are deprecated",

    }

    /**
     * Returns a {@link Map} where the keys are the type variables and the values are the type arguments
     * of the specified parameterized type (class or interface).
     *
     * @param clazz
     *            the parameterized type (class or interface) to analyze. Cannot be null.
     * @return a {@link Map} where the keys are the type variables and the values are the type arguments
     */

import java.util.concurrent.atomic.AtomicLong;

/**
 * One or more variables that together maintain an initially zero {@code long} sum. When updates
 * (method {@link #add}) are contended across threads, the set of variables may grow dynamically to
 * reduce contention. Method {@link #sum} (or, equivalently, {@link #longValue}) returns the current
 * total combined across the variables maintaining the sum.
 *

   *
   * @param formal The type whose type variables or itself is mapped to other type(s). It's almost
   *     always a bug if {@code formal} isn't a type variable and contains no type variable. Make
   *     sure you are passing the two parameters in the right order.
   * @param actual The type that the formal type variable(s) are mapped to. It can be or contain yet