14 - General Overview Test #1 (password protected)

  Variables, IF statements and Loops

  Iteration, String Manipulation and Arrays

  Sequence, Selection and Iteration

  Variables, Constants and Lists (Arrays)

Unit of Gravity
Value of PI
Score of the player
Health of the player

  Unit of Gravity and Health

  Score of the player and Health of the player

  Value of PI and Score of the player

  Unit of Gravity and Value of PI

wholenumber= input("Enter a whole number please ")
answer = wholenumber *10 
print(answer)

  Answer is: 10

  ERROR

  Answer is: 50

  Answer is: 5555555555

pocket_money= input("How much pocket money do you have left? ")
answer = float(pocket_money) -5.00
print("Well, you owe me £5.00, so that leaves you with   £", answer)

  The variable 'pocket_money' is converted to a float data type and £5.00 is being subtracted from it

  The variable 'pocket_money' is being converted into a whole number and £5.00 is then subtracted

  The variable 'pocket_money' is being initialised to zero. £5.00 is being subtracted,causing an error for the value of 'answer'

  The constant 'pocket_money' is being floated (e.g. divided by 0) and £5.00 is subtracted from the result

print (6 % 4)

  2

  3

  9

  12

print (10 //3) # floor division: always truncates fractional remainders. Note using a single '/' would produce a different result.

  3

  2

  9

  12

print (3.0**2.0) 

  9

  2

  3

  12

score = input("Enter score: ")
score = int(score)
if score >= 80:
    grade = 'A'
else:
    if score >= 70:
        grade = 'B'
    else:
        if score >= 55:
            grade = 'C'
        else:
            if score >= 50:
                grade = 'Pass'
            else:
                 grade = 'Fail'
print ("\n\nGrade is: " + grade) 

  Indented iteration / Fail

  Simple IF Statements / Pass

  Nested IF statements' / Fail

  Iteration and IF statements / Fail

password="open123"
print('Enter password:')
answer=input()
if answer==password
                print("yes")
  else:
                print("no")

  There is a missing colon on line 4 and the indentation is incorrect on line 6

  Line 3 should be indented and Line 4 is missing a colon

  There is nothing wrong with it.

  It is not in a function, so will not run. Line 3 should also be indented

def  function1():
   i=1
   while i < 11:
      number=2
      print(i*number)
      i =i+1
    
def  function2():
   for i in range(1,11):
      number=2
      print(i*number)

function1()
function2()

  Both functions are identical and print the number '2', 11 times.

  Function 1 uses a while loop to count from 1 to 11, going up by 2. Function 2 simply prints the numbers 1 to 11 in order

  Function 1 works correctly to print the 2 times table, and function 2 produces an error as a for loop cannot be used to do this

  They both use loops (function 1 - while loop, function 2 - for loop) to produce the 2 times table up to 10. (e.g. 2,4,6,8,10 etc…)

  A while loop may not run at all if the starting condition is not met.

  A while loop's stopping condition is defined at the start where as a for loop has a known amount of iterations

  All the statements listed here are valid differences between for and while loops

  A while loop is condition controlled and a for loop is count controlled

x = 1
while x<2:
    print ("I love python")

  There are no errors in the code - it will correctly print "I love python" once.

  The code prints "I love python" 2 times. Change line 2 to: while x <1:

  The code produces an infinite loop. Line 4 needs the inclusion of: x=x+1

  The code prints "I love python" just once, but then produces an error. Line 1 needs to be: x=0

number=int(input("Enter a number:"))
for i in range(number):
  print("*",end="")
  for i in range(2):
    print("*",end="")
  print()

On running the program with an input of 5
we get a 3 x 5 matrix. 

Output
=======
Enter a number: 5
***
***
***
***
***

  The second for loop in the code (for i in range(2): needs to be changed to: for i in range(number):

  The first for loop in the code (for i in range(number) needs to be changed to: for i in range(i)

  The first for loop in the code (for i in range(number) needs to be changed to: for i in range(number-1)

  The second for loop in the code (for i in range(2): needs to be changed to: for i in range(number-1):

print (7 < 10)
print (4 < 16)
print (4 == 4)
print (4 <= 4)
print (4 >= 4)
print (4 != 3)   

  Boolean Expressions / True, True, True, False, False, True

  Integer division expressions / True, False, True, True, True, True

  Boolean expressions / 'False' in all cases

  Boolean expressons / 'True' in all cases

def mysteryfunction(x,y):
  return (x+y)%5


print(mysteryfunction(2,3))

  Parameter passing / Output: 0

  Function creation / Output: 5

  Parameter passing / Output: 6

  Parameter passing / Output: 1

matrix = [1,2,3,4,5,6,7]
matrix[3]="x"
print(matrix)

  [1,2,x,4,5,6,7]

  Error

  [1, 2, 3, 'x', 5, 6, 7]

  [x,x,x,x,x,x,x]

def main():
#1. Create a nested list (each list is a row on the matrix)
   matrix = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
#2. print the matrix so it displays row by row in a square grid
   for i in matrix:
      print(i[2])
main()

  1,4,7

  3,6,9

  2,5,8

  1,2,3

word = "Python"
print(word[0:3])

  pyth

  pyt

  thon

  th

filename = "hello.txt"
file = open(filename, "r")
for line in file:
   print line,

  r' indicates the letter that is being written to the file

  r' simply indicates the name of the file (extension such as hello.txt.r)

  r' indicates the letter that will separate each line

  r' indicates the 'mode' - in this case 'r' for reading from file

  reading to

  over writing

  finding

  duplicating

def binary_search(item_list,item):
	first = 0
	last = len(item_list)-1
	found = False
	while( first<=last and not found):
		#what needs to go here?
		if item_list[mid] == item :
			found = True
		else:
			if item < item_list[mid]:
				last = mid - 1
			else:
				first = mid + 1	
	return found
	
print(binary_search([1,2,3,5,8], 6))

  mid = first * last //2

  mid = (first + last)//2

  mid = first + last

  mid = first /2

def Sequential_Search(dlist, item):

    pos = 0
    found = False
    
    while pos < len(dlist) and not found:
        if dlist[pos] == item:
            found = True
        else:
            pos = pos + 1
    
    return found, pos

print(Sequential_Search([11,23,58,31,56,77,43,12,65,19],31))

  (False, 3)

  (True, 3)

  FOUND

  TRUE

def bubbleSort(nlist):
    for passnum in range(len(nlist)-1,0,-1):
        for i in range(passnum):
            if nlist[i]>nlist[i+1]:
                temp = nlist[i]
                nlist[i] = nlist[i+1]
                nlist[i+1] = temp

nlist = [14,46,43,27,57,41,45,21,70]
bubbleSort(nlist)
print(nlist)

  It finds the length of the list and adds 1 to it. In this case len(nlist) would give: 10

  It finds the maximum index number of the list (in this case 10)

  It gives the length of the list 'nlist' in this case 9

  It performs string manipulation on the list to retreive the 9th element

  arrays

  functions

  variables

  IF statements

startNumber = int(raw_input("Enter the start number here "))
endNumber = int(raw_input("Enter the end number here "))

def fib(n):
    if n < 2:
        return n
    return fib(n-2) + fib(n-1)

print map(fib, range(startNumber, endNumber))

  1,3,5,7

  1,2,3,4

  1,1,2,3

  1,1,3,5