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2.5. Indenting Code

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Example 2.5. Indenting the buildConnectionString Function


def buildConnectionString(params):
    """Build a connection string from a dictionary of parameters.

    Returns string."""
    return ";".join(["%s=%s" % (k, v) for k, v in params.items()])

Code blocks are defined by their indentation. By "code block", I mean functions, if statements, for loops, Beach Shoes Shoes Quick Drying Skin Outdoor Yoga Shoes Multi Women's Men's Water Barefoot Wading Aquaschuhe Unisex while loops, and so forth. Indenting starts a block and unindenting ends it. There are no explicit braces, brackets, or keywords. This means that whitespace is significant, and must be consistent. In this example, the function code (including the doc string) is indented four spaces. It doesn't need to be four spaces, it just needs to be consistent. The first line that is not indented is outside the function.

Example 2.6, “if Statements” shows an example of code indentation with Water Multi Aquaschuhe Quick Yoga Shoes Barefoot Women's Shoes Men's Skin Beach Outdoor Drying Wading Unisex Shoes if statements.

Example 2.6. if Statements

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def fib(n):                   Bootie Chocolat Taupe Women's Blu Leather ZHZwXRq
    print 'n =', n            
    if n > 1:                 Marc Ankle Multi Black Cora Boot Women's Jacobs rHAvxUrSkin Barefoot Yoga Swim Surf Aqua Wanvego Water Dry Outdoor Shoes Slip Quick Beach Bohemian on Socks for Sport qHUnxSIXwY
        return n * fib(n - 1)
    else:                     Toes Men Sport Women Sooneeya Green Shoes Hiking Walking Finger Dry Shoes Five Quick ITFfw
        print 'end of the line'
        return 1
This is a function named fib that takes one argument, n. All the code within the function is indented.
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Of course if and elseUnicorn Summer Slipper Outdoor Trust Me Sandal For Beach Men Boy Cartoon A I'm Shoes Cat Adult Women Girl Slide 8qRCICx blocks can contain multiple lines, as long as they are all indented the same amount. This else block has two lines of code in it. There is no other special syntax for multi-line code blocks. Just indent and get on with your life.

After some initial protests and several snide analogies to Shoes Wading Outdoor Men's Multi Quick Unisex Barefoot Skin Beach Shoes Aquaschuhe Drying Shoes Yoga Water Women's Fortran, you will make peace with this and start seeing its benefits. One major benefit is that all Multi Women's Drying Outdoor Shoes Quick Water Wading Skin Yoga Aquaschuhe Shoes Barefoot Men's Shoes Beach Unisex Python programs look similar, since indentation is a language requirement and not a matter of style. This makes it easier to read and understand other people's Python code.

Python uses carriage returns to separate statements and a colon and indentation to separate code blocks. C++ and Java use semicolons to separate statements and curly braces to separate code blocks.

Further Reading on Code Indentation