## Read env vars in Python { #read-env-vars-in-python }

You could also create environment variables **outside** of Python, in the terminal (or with any other method), and then **read them in Python**.

For example you could have a file `main.py` with:

```Python hl_lines="3"
import os

name = os.getenv("MY_NAME", "World")
print(f"Hello {name} from Python")
```

/// tip

    assertFailsToDecode(base16(), "EFGH", "Unrecognized character: G");
    // Valid base16 strings always have an even length.
    assertFailsToDecode(base16(), "A", "Invalid input length 1");
    assertFailsToDecode(base16(), "ABC");
    // These have a combination of invalid length and unrecognized characters.
    assertFailsToDecode(base16(), "?", "Invalid input length 1");

          @Override
          public void run() {
            assertFalse("previous tearDown should have run before setUp", setUpRan.getAndSet(true));
          }
        };
    Runnable tearDown =
        new Runnable() {
          @Override
          public void run() {
            assertTrue("setUp should have run", setUpRan.getAndSet(false));
          }
        };

 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package jcifs.smb;

import org.jspecify.annotations.NullUnmarked;

/**
 * Basher test for {@link ConcurrentHashMultiset}: start a bunch of threads, have each of them do
 * operations at random. Each thread keeps track of the per-key deltas that it's directly
 * responsible for; after all threads have completed, we sum the per-key deltas and compare to the
 * existing multiset values.
 *
 * @author mike nonemacher
 */

@NullUnmarked

        } catch (ThemeException e) {
            assertEquals(expectedMessage, e.getMessage());
            assertNull(e.getCause());
        } catch (Exception e) {
            fail("Should have caught ThemeException, but caught: " + e.getClass());
        }
    }

    public void test_throwAndCatchWithCause() {
        // Test throwing and catching exception with cause

package com.google.common.cache;

import com.google.common.annotations.GwtCompatible;

/**
 * An object that can receive a notification when an entry is removed from a cache. The removal
 * resulting in notification could have occurred to an entry being manually removed or replaced, or
 * due to eviction resulting from timed expiration, exceeding a maximum size, or garbage collection.
 *

        // Verify that multiple threads were processed
        assertTrue("Should process at least one thread", threadCount.get() >= 1);
        assertTrue("Should have stack trace elements", stackTraceCount.get() > 0);
        assertTrue("Should have more stack traces than threads", stackTraceCount.get() > threadCount.get());
    }

    public void test_processThreadDump_withException() {

                log.debug("Have new tree connection for retry");
            } catch (final SmbException e) {
                log.debug("Failed to connect tree on retry", e);
                last = e;
            }
        }

        if (last != null) {
            log.debug("All attempts have failed, last exception", last);
            throw last;
        }

    /**
     * Returns a hashcode for this IP address. The hashcode comes from the IP address
     * and is not generated from the string representation. So because NetBIOS nodes
     * can have many names, all names associated with an IP will have the same
     * hashcode.
     */

    @Override
    public int hashCode() {
        return this.address;
    }

    /**