List operarions

num[0]= num[1] - 5 #num[1] is 9 num[0]= 9 - 5 num[0]= 4

In the beginning: num = [10, 9, 8, 7, 6, 5] because: num[0] = num[1] - 5 and num[1] is 9, and num[0] = 4 thus now: num = [4, 9, 8, 7, 6, 5] Because 4 in [4, 9, 8, 7, 6, 5], num[3], which is 7, is printed.

Num=(10,9,8,7,6,5) Num[0]=num[1]-5 If in nums: Print(nums[3]) Else: Print(nums[4]) It is the answer because they said output nums number 3 And remember when you start counting you start from zero Now the new will be Num=(4,9,8,7, 6, 5) So the third one we will be 7 And if you still don't understand go back to the beginning where the lesson just started it's no big deal

Because list first item is the 0, the second item is 1... In this example num[0] is 10, num[1] is 9...

num[0] = num[1] -5#num[1] is 9 num[0]=9-5 num[0]=4

I'll try and break it down line by line: Line #1 num=(10,9,8,7,6,5) # The list and its contents are provided and assigned to the variable num Line #2 num[0]=num[1]-5 # num[0] is reassigning the value of the 1st element in the list (currently 10) to the difference of the value of the 2nd element (currently 9) minus 5. 9-5=4. The 1st element now has a value of 4. Now, num=(4,9,8,7,6,5) Line #3 If 4 in num: # This is testing if the value of 4 exists in the list assigned to the num variable. If it is True (i.e. the value is found), move on to the next line. If False, move on to Line #6 Line #4 print(num[3]) # This is saying to print the value of the 4th Element in list assigned to the num variable (currently 7) Line #6 print(num[4]) # This is saying to print the 5th element of the list assigned to the variable num (currently 6) if the test in Line 3 were False.

nums = [3, 2, 8] print(not 4 in nums) print(4 not in nums) print(not 3 in nums) print(3 not in nums)

Given is num,condition is num[0]=num[1]-5,so we assign num[1]=9-5=4 Go to loop If 4 is print num[3] Result is 4 so we print the 3 num.3 num is 7.so 7 is answer

Coming to 2nd row num[0] which is 10 is asigned ir replaced with num[1]-5 or 9-5 or 4 Now in 3rd row.... 4 in nums is true hence num[3] means 4th numbers will be printed which is 7

List operarions num=(10, 9,8,7,6,5) num[0]=num[1]-5 #num[0] = 10 and num[1]-5 = 9-5 = 4. #we take the number four and we affect to num[0] which is equal to 10,that mean num[0] = 4 now. If 4 in nums: #from what is above we know that the number 4 exists in the list, so the condition is checked. print(num[3]) #like that our condition is checked, so the first print () is executed.which gives us the result as 7, because do you remember that:num[0]=4,num[1]=9,num[2]=8, and num[3]= 7, ...etc else: print(num[4])