CPSC120B - Day 8 Notes

Can put any code you want inside of a loop, including another loop
```
for i in range(2):
    for j in range(3):
        print(i, j)
```
This is useful when dealing with information in a grid, spreadsheets, simulations, or images
Where nested loops get a bit more tricky is when the inner loops uses the outer loop’s iterator variable
```
for i in range(1, 4):
    for j in range(i):
        print(i, j)
```

Have your tried to put a comma after a variable or a period at the end of a sentence when printing?
For example: print('the result is', result, '.')
There is a space between the value and the period
The documentation for the print function lists a couple of optional arguments
sep specifies what separates each thing that is printed
It defaults to a space, ‘’, but we can set it to be the empty string, ’’
So the above example becomes print('the result is ', result, '.', sep='')
Note we now need a space in the string before the result because we lost that space as well.
The print function also always gives a new line, sometimes you don’t want that.
The end argument lets you change that.
For example, print(i, j, end='') will put all print statements on one line
This is useful when working with a loop.
But how do you get a new line when you are done?
What if you are nesting and want new lines in the outer loop?