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Computer Programming: Python - Module 2
(Code) Questions Answers
if x == y: →something ✅#if x equals y do something #can be >, <, >=, <=, != (not equal to) while x == y: →something ✅#while x is equal to y do something #can be >, <, >=, <=, != (not equal to) while True: →something →if x == y: →→break ✅ while True: →something →if x == y: →→continue ✅ for i in range (x): →something ✅#does "something" "x" times, starts counting at "0" for i in range (x,y): →something ✅#starts counting at x and ends at y #x>y for i in range (x,y,z): →something ✅#starts counting at x by increments of z and ends at y pass ✅an empty instruction x > y and q == z ✅checks if x is greater then y and if q equals z before continuing (also can be done with or) not (Variable == 0) ✅same as Variable != 0 & | ~ ^ ✅(ampersand) bitwise conjunction (bar) bitwise disjunction (tilde) bitwise negation
(caret) bitwise exclusive or (xor) the arguments of these operators must be integers Var = 17 VarRight = Var >> 1 VarLeft = Var << 2 print(Var, VarLeft, VarRight) ✅17 68 8 #17 // 2 → 8 (shifting to the right by one bit is the same as integer division by two) 17 * 4 → 68 (shifting to the left by two bits is the same as integer multiplication by four) numbers = [ 10, 5, 7, 2, 1 ] numbers[2] = 111 ✅background: [ 10, 5, 111, 2, 1 ] numbers = [ 10, 5, 7, 2, 1 ] len(numbers) ✅#len determines the lists length numbers = [ 10, 5, 7, 2, 1 ] del numbers[1] ✅background: [ 10, 7, 2, 1 ] numbers = [ 10, 5, 7, 2, 1 ] print(numbers[-1]) ✅ 1 numbers = [ 10, 5, 7, 2, 1 ] numbers.append(4) ✅background: [ 10, 5, 7, 2, 1, 4 ] numbers = [ 10, 5, 7, 2, 1 ] numbers.insert (1, 33) ✅background: [ 10, 33, 5, 7, 2, 1, ] list = [ 8, 10 , 6, 2, 4 ] list.sort( ) print(list) ✅[2, 4, 6, 8, 10] list1 = [ 1 ] list2 = list1 [ : ] list1 [ 0 ] = 2 print(list2) ✅[1] #[ : ] creates a new list for list 2 instead of assigning list2 to the same location as list list = [10, 8, 6, 4, 2] new_list = list [1:4] print (new_list) ✅[8, 6, 4]
