question about loops

[deanhystad]

There is one print, the print in the function named Q9().

def Q9(n):
    for i in range(n):
        print(i)
Q9(5)

Output:
0
1
2
3
4

As rob101 said, you can modify the print command to put all the output on 1 line.

def Q9(n): # n is an arbitrary variable name
    for i in range(n):
        print(i, end=" ")  # This prints numbers
Q9(5)  # This calls the function that prints the numbers

Output:
0 1 2 3 4 

jIn both instances there is 1 print for each number counting up from 0 to n. It is just a matter of printing all the numbers on one line or separate lines.

If that doesn't resolve your confusion, there is one other thing that may be producing extra output in a jupyter notebook.

Jupyter is a bit odd in that it automatically prints results without having to call print(). If you call a function and it returns a result that is not None, jupyter automatically prints the result. I modified Q(n) to return n. Jupyter will see a non-None result and print it. This code will print the numbers, then it prints n.

def Q9(n):
    for i in range(n):
        print(i, end=" ")
    return(n)
Q9(5)

Output:
0 1 2 3 4 
5

The automatic printing can be suppressed by adding a semicolon to the end of the line.

def Q9(n):
    for i in range(n):
        print(i, end=" ")
    return(n)
Q9(5);

If you are seeing extra prints that you don't expect, look for function calls that return values. To stop them from printing, add semicolons to those lines.