Coding

• Generating a random number

  Import random

  
  

  print(“Roll the dice”)

  
  

  number = random.randint(1,6)

  #First number is the lowest number that can be generated

  #Last number is the highest number it can generate

  
  

  print(“You got”,number)

  #Prints out randomly generated number
• one dimensional array

  #------One dimensional array------#

  
  

  #Defines a list with the variable name you give it

  
  

  #Words must be put in quotation marks

  animals = ["dog","cat","lion","mice"]

  
  

  #Numbers do not need to be put in quotation marks

  numbers = [1,2,3,4]
• Positions in lists

  #---------Positions in lists--------#

  #Position 1 in the list is known as 0

  print(numbers[0])

  
  

  #Position 2 = the animal third in the array

  print(animals[2])

  
  

  #Prints animals in position 1 and 2 but not 3

  print(animals[1:3])

  
  

  #Prints numbers from position 1 and onwards

  print(numbers[1:])

  
  

  #Prints animals up to position 3 but not including position 3

  print(animals[:3])
• Editing elements in a list

  #------Editing elements in a list-------#

  #current list of animals

  
  

  print(animals)

  
  

  #modifies the first value in the list

  animals[0] = "monkey"

  print()

  print(animals)

  
  

  #Letting the user choose which position they would like to replace

  choice1 = int(input("Which position in the list would you like to edit?" ))

  
  

  #User chooses their animal in replacement

  choice2 = input("Which animal would you like instead? ")

  animals[choice1] = choice2

  
  

  #Prints out the new list

  print(animals)
• Adding and removing from a list

  #List of students

  students = ["Nazor","Zara","Obi"]

  
  

  #append adds a student to the list

  students.append("Patience")

  print(students)

  
  

  #remove takes away a student from the list

  students.remove(students[2])

  print(students)

  
  

  #List of scores

  scores = [34,56,23,72]

  
  

  #prints specific student and score. Converts the score to a string as you can't add a string to integer

  print(students[0]+" has "+str(scores[2])+" points.")
• Merging lists

  students = ["Nazor","Zara","Obi"]

  visitors = ["Tobi","Elise","Rachel"]

  
  

  #extends the student list by adding the visitors

  students.extend(visitors)

  
  

  #prints out the length of the students list (number of students in the list)

  print(len (students))

  
  

  #Prints out the last student from the list. Minus numbers count from the end of the list

  print(students[-1])

  
  

  #Prints out the last 3 students in the list

  print(students[-3:])
• Searching lists

  #----------Searching lists----------#

  #list of people

  people = ["jack","kim","tony","mike"]

  #searches a list

  #While true loop used so that the program does not end after we have searched for one student

  while True:

  name = input("Student search: ")

  if name in people:

  print("They are in my list.")

  else:

  print("They are not in my list")

  print()

  print()
• Sorting a list

  #-----------Sorting a list-----------#

  #colour list

  colourlist = ["red","green","blue","yellow","purple","black","orange"]

  
  

  print(colourlist)

  
  

  #sorts colours into alphabetical order

  #need the word sorted infront of the list you want to sort

  print(sorted(colourlist))
• Random from a list

  #always need this

  import random

  
  

  numbers = [1,2,3,4,5,6,7,8,9,10]

  
  

  #Randomly choses a number from the list

  choice = random.choice(numbers)

  
  

  print(choice)
• 2 dimensional arrays

  scores = [

  ["Jane", 23,69,72],

  ["Bob",12,62,45],

  ["Toni",78,96,56],

  ]

  #Prints out the first element of the list

  print(scores[0])

  #Number in the first bracket is the row you are looking for

  #Number in the second bracket is the column you are looking for

  
  

  #Will print out first column, first row which is the name

  print(scores[0][0])

  
  

  #If we want Jane's second test result:

  print(scores[0][2])