# Ambientes Virtuais

Ao trabalhar em projetos Python, você provavelmente deve usar um **ambiente virtual** (ou um mecanismo similar) para isolar os pacotes que você instala para cada projeto.

/// info | "Informação"

Se você já sabe sobre ambientes virtuais, como criá-los e usá-los, talvez seja melhor pular esta seção. 🤓

///

/// tip | "Dica"

Um **ambiente virtual** é diferente de uma **variável de ambiente**.

environment variable when building the toolchain using make.bash,
or you can set the CC environment variable any time you run the go tool.

The CXX_FOR_TARGET, CXX_FOR_${GOOS}_${GOARCH}, and CXX
environment variables work in a similar way for C++ code.

# Go references to C

Within the Go file, C's struct field names that are keywords in Go
can be accessed by prefixing them with an underscore: if x points at a C

  //     Iterable<? extends T> iterable,
  //     Predicate<? super T> predicate,
  //     @JointlyNullable T defaultValue);
  //
  // ...where "@JointlyNullable" is similar to @PolyNull but slightly different:
  //
  // - @PolyNull means "@Nullable or @Nonnull"
  //   (That would be unsound for an input Iterable<@Nullable Foo>. So, if we wanted to use

  }

  /**
   * Returns an InetAddress representing the literal IPv4 or IPv6 host portion of a URL, encoded in
   * the format specified by RFC 3986 section 3.2.2.
   *
   * <p>This method is similar to {@link InetAddresses#forString(String)}, however, it requires that
   * IPv6 addresses are surrounded by square brackets.
   *
   * <p>This method is the inverse of {@link InetAddresses#toUriString(java.net.InetAddress)}.

    mmHeap.remove(12);
    assertEquals(14, mmHeap.size());
    assertTrue("Heap is not intact after remove()", mmHeap.isIntact());
  }

  /** This tests a more obscure special case, but otherwise similar to above. */
  public void testInvalidatingRemove2() {
    MinMaxPriorityQueue<Integer> mmHeap = MinMaxPriorityQueue.create();
    List<Integer> values =
        Lists.newArrayList(

      array[i] = ((Number) checkNotNull(boxedArray[i])).floatValue();
    }
    return array;
  }

  /**
   * Returns a fixed-size list backed by the specified array, similar to {@link
   * Arrays#asList(Object[])}. The list supports {@link List#set(int, Object)}, but any attempt to
   * set a value to {@code null} will result in a {@link NullPointerException}.
   *

      array[i] = ((Number) checkNotNull(boxedArray[i])).doubleValue();
    }
    return array;
  }

  /**
   * Returns a fixed-size list backed by the specified array, similar to {@link
   * Arrays#asList(Object[])}. The list supports {@link List#set(int, Object)}, but any attempt to
   * set a value to {@code null} will result in a {@link NullPointerException}.
   *

      array[i] = ((Number) checkNotNull(boxedArray[i])).floatValue();
    }
    return array;
  }

  /**
   * Returns a fixed-size list backed by the specified array, similar to {@link
   * Arrays#asList(Object[])}. The list supports {@link List#set(int, Object)}, but any attempt to
   * set a value to {@code null} will result in a {@link NullPointerException}.
   *

      array[i] = ((Number) checkNotNull(boxedArray[i])).longValue();
    }
    return array;
  }

  /**
   * Returns a fixed-size list backed by the specified array, similar to {@link
   * Arrays#asList(Object[])}. The list supports {@link List#set(int, Object)}, but any attempt to
   * set a value to {@code null} will result in a {@link NullPointerException}.
   *

      array[i] = ((Number) checkNotNull(boxedArray[i])).longValue();
    }
    return array;
  }

  /**
   * Returns a fixed-size list backed by the specified array, similar to {@link
   * Arrays#asList(Object[])}. The list supports {@link List#set(int, Object)}, but any attempt to
   * set a value to {@code null} will result in a {@link NullPointerException}.
   *