TASK 1

Matching Brackets

Your task is to implement the function

def match_brackets(s: str) -> bool:

This takes a string s as input, and returns true if every ( has a matching )

Note: you can use string slices, "Hello"[1:4] returns "ell"

Your code should work with all possible strings, by ignoring anything that is not "(" or ")".

Some Examples:

"()" should return True
"(2+2)*10" should return True
"(()" should return False
"))((" should return False
"((()())(())(())))" should return True

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GUIDE

This guide is intended to help with syntax. See the prelude section for pre-defined functions and variables. See the tutorials page for tutorials on how to write code.

Data Types
- int
  int
  Integer values, such as 2, -4 and 254.
- float
  float
  Floating point values, such as 2.0, -4.72 and 254.2681.
- string
  string
  String values, such as "hello, world!", "haha" and "33".
- boolean
  boolean
  Boolean values True and False.
- colour
  colour
  Colour values for drawing on the canvase, See the prelude for more.
- list
  list[element_type]
  List values. Note the element type must be correctly specified. Examples are [1,2,3], [["hello"], ["world"]] and [].
Variables
- declaration
  name: type
  A variable must first be declared with a type before it can be used
- assignment
  name = value
- increment
  name += value
  Only applicable to integer values. Equivalent to name = name + value .
- decrement
  name -= value
  Only applicable to integer values. Equivalent to name = name - value .
Expressions
- logic
  
  Applicable to boolean values. and, or and not.
- mathematical
  
  Applicable to numerical values. +, -, *, **, /, // and %.
- relational
  
  Applicable to comparable values. >, <, ==, !=, <= and >=.
Selection Statements
- if
  if condition: statements elif condition: statements else: statements
Loops
- while
  while condition: statements
- for
  for ident in list: statements
Function
- function
  def name(parameter: parameter_type) -> return_type: statements
  Values can be returned with return
- procedure
  def name(parameter: parameter_type): statements
  Equivalent to a function which returns a None type

Can't find what you're looking for?

Check the tutorials page for more!

PRELUDE

The prelude is all the pre-defined functions and variables available to use. See the tutorials page for tutorials on how to write code.

Terminal Functions
- print
  print(expr)
  Prints the value of the expression to the terminal.
- print_str
  print_str(expr)
  Prints the value of the expression as a string to the terminal.
- clear_terminal
  clear_terminal()
  Clears the terminal.
- input
  input(message: str) -> str
  Displays message to the user, and returns their input as a string.
Type Functions
- str
  str(expr) -> str
  Where possible returns the string representation of expr.
- int
  int(expr) -> int
  Where possible parses the integer representation of expr.
- float
  float(expr) -> float
  Where possible parses the float representation of expr.
- len
  len(expr) -> int
  Where possible returns the length of expr.
- type
  type(expr) -> str
  Returns the name of the type of expr.
Math Functions
- round
  round(n: float) -> int
  Rounds the value of n using bankers rounding.
- random_int
  random_int(from: int, to: int) -> int
  Returns a random integer between from and to.
- random_float
  random_float(from: float, to: float) -> float
  Returns a random float between from and to.
- pi
  pi: int
  The value of π.
String Functions
- upper
  str.upper()
  Returns the uppercase of str.
- lower
  str.lower()
  Returns the lowercase of str.
- replace
  str.replace(s1: str, s2: str)
  Returns a string will all occurances of s1 replaced with s2.
- split
  str.split(d: str)
  Returns a list of strings of str split on all occurances of d.
- join
  str.join(ss: list[str])
  Returns a string from joining all strings in ss using d.
- isnumeric
  str.isnumeric() -> bool
  Returns true if all characters in str are numbers.
List Functions
- append
  l.append(elem)
  Appends elem to the list l.
- remove
  l.remove(elem)
  Removes the first instance of elem from the list l.
- count
  l.count(elem)
  Returns the total of elems present in the list l.
- range
  range(f: int, t: int) -> list[int]
  Returns the list of values from f to t.
Drawing Functions
- line
  line(x1: int, y1: int, x2: int, y2: int)
  Draws a line from (x1,y1) to (x2,y2).
- rect
  rect(x: int, y: int, w: int, h: int)
  Draws a rectangle of dimensions w by h on the canvas at position (x,y).
- circle
  circle(x: int, y: int, r: int)
  Draws a circle with radius r on the canvas at position (x,y).
- ellipse
  ellipse(x: int, y: int, r1: int, r2: int)
  Draws an ellispe with horizontal radius r1 and vertical radius r2 at position (x,y).
- arc
  arc(x: int, y: int, r: int, f: int, t: int)
  Draws an arc with radius r on the canvas at position (x,y) from f degrees to t degrees.
- sect
  sect(x: int, y: int, r: int, f: int, t: int)
  Draws a sector with radius r on the canvas at position (x,y) from f degrees to t degrees.
- triangle
  triangle(x1: int, y1: int, x2: int, y2: int, x3: int, y3: int)
  Draws a triangle with corners at positions (x1,y1), (x2,y2) and (x3,y3).
- polygon
  polygon(xs: list[int], ys: list[int])
  Draws a polygon with corners at positions (xi,yi) from xs and ys.
- img
  img(x: int, y: int, w: int, h: int url: string)
  Draws the image loaded from the url at position (x,y) with width w and height h.
- text
  text(x: int, y: int, t: string)
  Draws the text t at position (x,y).
Colour Functions
- rbg
  rgb(r: int, g: int, b: int) -> colour
  Returns the colour for the respecive red, green and blue values.
- rbga
  rgba(r: int, g: int, b: int, a: float) -> colour
  Returns the colour for the respecive red, green and blue and alpha values. Alpha is opacity, in the range 0.0 to 1.0.
- red
  red: colour
  The built in colour red, equivalent to rgb(240, 51, 51).
- green
  green: colour
  The built in colour green, equivalent to rgb(98, 203, 166).
- blue
  blue: colour
  The built in colour blue, equivalent to rgb(117, 117, 232).
- pink
  pink: colour
  The built in colour pink, equivalent to rgb(197, 89, 146).
- yellow
  yellow: colour
  The built in colour yellow, equivalent to rgb(221, 192, 107).
- white
  white: colour
  The built in colour white, equivalent to rgb(255, 255, 255).
- black
  black: colour
  The built in colour black, equivalent to rgb(0, 0, 0).
- transparent
  transparent: colour
  The built in colour transparent, equivalent to rgba(0, 0, 0, 0.0).
Canvas Functions
- width
  width: int
  The width of the canvas in pixels.
- height
  height: int
  The height of the canvas in pixels.
- line_colour
  line_colour(c: colour)
  Sets the canvas line colour to c.
- fill_colour
  fill_colour(c: colour)
  Sets the canvas fill colour to c.
- line_width
  line_width(w: int)
  Sets the canvas line width to w.
- font_size
  font_size(s: int)
  Sets the canvas font size to s.
- translate
  translate(x: int, y: int)
  Translates the canvas by (x,y).
- rotate
  rotate(a: int)
  Rotates the canvas by angle a in degrees.
- scale
  scale(x: float, y: float)
  Scales the canvas size by (x,y).
- frame_rate
  frame_rate(s: int)
  Sets the frame rate of the definable draw function.
- stop_draw
  stop_draw(s: int)
  Stops the execution of the definable draw function.
Definable Functions
- draw
  def draw():
  Is called at frame_rate, intended for animations and games on the canvas.
- left_pressed
  def left_pressed():
  Is called whenever the left arrow key is pressed.
- right_pressed
  def right_pressed():
  Is called whenever the right arrow key is pressed.
- up_pressed
  def up_pressed():
  Is called whenever the up arrow key is pressed.
- down_pressed
  def down_pressed():
  Is called whenever the down arrow key is pressed.
- space_pressed
  def space_pressed():
  Is called whenever the space key is pressed.

Can't find what you're looking for?

Check the tutorials page for more!

TASK 1

Matching Brackets

Some Examples:

Well done!

You have completed all of the tasks.

Something isn't quite right...

GUIDE

Data Types

int

float

string

boolean

colour

list

Variables

declaration

assignment

increment

decrement

Expressions

logic

mathematical

relational

Selection Statements

if

Loops

while

for

Function

function

procedure

Can't find what you're looking for?

PRELUDE

Terminal Functions

print

print_str

clear_terminal

input

Type Functions

str

int

float

len

type

Math Functions

round

random_int

random_float

pi

String Functions

upper

lower

replace

split

join

isnumeric

List Functions

append

remove

count

range

Drawing Functions

line

rect

circle

ellipse

arc

sect

triangle

polygon

img

text

Colour Functions

rbg

rbga

red

green

blue

pink

yellow