Python - Computer Science

• Code


  1. print("STAY")

  2. print("CALM")

  3. print("AND")

  4. print("LEARN")
• IDLE


  • STAY
  • CALM
  • AND
  • LEARN
• Which one of the following will produce the following output Hello World ?

  
  

  a)print“Hello World”

  b)print(“Hello World”);

  c)print(“Hello World”)

  d)print(“Hel World”)

  e)print(Hello World)

  Ans: C
• print("Hello, what is your name?")

  name = input()

  print("What is your top 2 favourite films" + name"?")

  favouritefilm1 = input("1.")

  favouritefilm2= input("2.")

  favouritefilm3 = input("3.")

  Hello Vaishaa, your top 3 favourite films are as follows:

  1.Guardians of the Galaxy

  2.Endgame

  3. Finding Nemo
• To make a variable that will be stored in the python program, what must you remember?


  no blank space, can not start with number , case sensitive , underscore permitted
• What symbol do you use to comment on your code?


  # (hashtag)
• For python to do mathematical calculations, e.g. division.... you would use what symbol?


  / (forward slash)
• *


  means multiplication in python for mathematical calculations
• symbol for equals to

  ==
• symbol for not equals to 


  !=
• greater than


  >
• less than


  <
• greater than or equal to


  >=
• less than or equal to

  <=
• True or false

  6>=8

  False
• True or false

  6!=7

  True
• When do you use the int function? e.g. int(answer)


  when the answer is a whole integer
• What is the error in this code?

  if answer ==5

  print("Well Done")

  else:

  
  

  ANSWER:

  print("Sorry the answer was 5")

  if answer ==5:

  print("Well Done")

  else:

  print("Sorry the answer was 5")
• What is the difference between == and = ?


  == means equal to

  = means assigned to like a name being assigned to a variable
• Key points

  
  

  
  

  print("Please enter your name: ")

  my_name = input ()

  print(my_name + " what age are you")

  my_age = input()

  my_age = int(my_age)

  if my_age > 11:

      print("You must go to Secondary school")

  else:

       print("You must go to Primary school")
• What is a score known as?

  a counter
• Elif statements


  if score==6:

  print("You scored, score, out of 6,", name,". Your rank is TOTAL GENIUS.")

  elif score==5:

  print("You scored, score, out of 6,", name,". Your rank is MATHS GENIUS.")

  elif score==4:

  print("You scored, score, out of 6,", name,". Your rank is INTERMEDIATE .")

  elif score==3:

  print("You scored, score, out of 6,", name,". Your rank is BEGINNER.")
• iteration definition


  Repetitive execution of the same block of code over and over is referred to as iteration. There are two types of iteration: Definite iteration, in which the number of repetitions is specified explicitly in advance. Indefinite iteration, in which the code block executes until some condition is met.
• looping definition


  repeating something over and over until a particular condition is satisfied
• CODE

  for i in range (0,5):

  print(i , "looping")


  IDLE

  0 looping

  1 looping

  2 looping

  3 looping

  4 looping
• For i ....


  0 is the starting value
• for i in range (3,31,3):

  print (i)

  3 - starting number (times table)

  31 - one higher than number want to finish with (counter)

  3 - difference of each number( number to increase each i by)
• CODE

  for i in range (4,21,4):

  print(i)


  IDLE

  4

  8

  12

  16

  20
• CODE

  num = 0

  for i in range (6,37,6)

  num= num+1

  print(num, "*", "6", "=", i)


  IDLE

  1 * 6 = 6

  2 * 6 = 12

  3* 6 = 18

  4* 6 = 24

  5 * 6 = 30

  6 * 6 = 36