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In this lecture, I would like to

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clarify the use of white space.

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So when to use one white space, when to use

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more than one, and when not to use white space.

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And to explain that to you, I've

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got a script here with three parts.

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Each of the parts will do the same thing.

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So the first one prints a, aa, and three

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a's and then b here, and then c.

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So the first one here, I typed in 1, 2, 3, 4, 5, 6, 6 spaces.

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So that will work.

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As you can see here, you get the

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outputs correctly, but it's not a good practice.

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Even though that will work, it's not a good

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practice because the code is not very readable.

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So that's a problem with this first block and

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here in the second block I fixed that.

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So the space here is just right.

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Basically, you want to separate things with spaces.

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When it comes to operators, such as the comparison operators,

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or plus or minus or multiplication, the code will work

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even if you don't have any spaces like that.

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However, to make the code more readable, it's better

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to have some spaces between operators as well.

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So the space between if and a number is a must.

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If you have that, the code will

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not work, you'll get an invalid syntax.

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However, no space between operators is fine.

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[No audio]

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So that's a problem in this block here,

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that you have this expression without spaces.

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In some particular cases, like sometimes I don't use

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spaces in the videos because I want to show

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you the text in a greater font.

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So I have to sacrifice with less spaces, so

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that I can fit more text in the screen.

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So unless you have a good reason

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to do so, please use spaces,

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one space, and then here, that is fine.

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So one space here, one here and one there,

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then after the colon so this is what you

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should know, and I told you already about indentation.

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After a colon, you always have indentation.

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Indentation means at least one space.

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So this would also work like that.

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But a good practice is to have four spaces, four.

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So that's correct.

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And when you have more code in

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your script, it's good to separate things

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with a break line, separate logics.

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So if you have a conditional block there,

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you have to write them line by line.

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No break lines here like that, that would

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also work, but please don't use break lines

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to make your code more readable.

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However, once the conditional block ends,

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you have another logical block.

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There's no clear cut rules here, but just user logic.

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So I thought it's good to have this

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print functions without a break line between them.

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So here, if I would add another function, I would make a

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break line and then create a function here and so on.

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And of course use indentation for functions as well.

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So after the colon always comes the indentation

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and that's it more or less about spaces,

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white space in Python.

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[Outro sound]