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def validate_attr(instance, attr, valid, errors=None, positive=True):
    '''Returns a list of errors (strings) for mom objects attribute
    validation.

    Parameters:
    instance:  instance or list of instances to validate.
    attr:      attribute name or list of attributes names as strings.
    valid:     valid value or list of valid values (invalid values if
               positive=False).
    errors:    an optional list to aggregate the errors into.

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import java.util.Map;
import processing.video.Movie;

String MOVIE_FILE = "videofile";
String OUTPUT_DIR = "pos/";
int SEEK_INTERVAL = 4;

String OBJ_NAME = "object_name";

DisposeHandler dh;

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$(document).ready(function() {
	$("#submit_button").on("click", function() {
		window.history.replaceState({}, 'foo page', '/foo');
	});
});

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var block_navigation = function(state) {
	if (state) {
		window.onbeforeunload = function(e) {
			// If we haven't been passed the event get the window.event
			e = e || window.event;
			var message = 'Any text will block the navigation and display a prompt';
			// For IE6-8 and Firefox prior to version 4
			if (e) { e.returnValue = message; }
			// For Chrome, Safari, IE8+ and Opera 12+
			return message;

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import Tkinter as tk
import serial

ANGLE_MIN = 0
ANGLE_MAX = 180
SERVO_MIN = 1
SERVO_MAX = 4

# Assign Arduino's serial port address
#   Windows example

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'''
This program controls the state of the waterpump and
LED's of the nuclear power station.
If the pump stops working a countdown of 10 seconds starts
ticking and then does 2 things:
1) turning on red lights instead of blue lights in the
   reactor's core.
2) cutting the power: writing outpin HIGH (on the arduino
   of the power system this will set the power out.

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Common sequence operations with examples

len

:::python
len('abc')  # -> 3

len([1, 5, 2, 3])  # -> 4

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List in-place operations

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Common string operations

Checks

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import java.util.List;
import java.util.ArrayList;
import java.util.Arrays;

class Exercise {

	public List<String> ex;

	public Exercise(String[] input) {
		ex = new ArrayList<String>(Arrays.asList(input));