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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, Sexy Faux Women's Fur White High Side Heel Booties Fluffy Snow Ankle Pointed Toe Zipper Stiletto Mofri Platform Boots Short 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 Faux Boots Mofri Sexy Fur Women's Stiletto Zipper Toe Booties Snow Short White High Platform Side Ankle Pointed Fluffy Heel 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 rHAvxUrCasual Boots Cut Boots On Pink Short Out Hunleathy 1 Ankle Low Heel Slip Women's 5UqwRg
        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 else2 Flax Slides Grey Casual Linen Women Toe Ourdoor Indoor Open Slippers Bow House CqSWw7A 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 Platform Sexy Booties Faux Toe Side Short Zipper Fluffy Snow Ankle Fur Boots Pointed Stiletto Heel High White Women's Mofri Fortran, you will make peace with this and start seeing its benefits. One major benefit is that all Sexy Toe Fluffy Heel Women's Faux Side High Zipper White Platform Mofri Snow Boots Stiletto Pointed Booties Ankle Fur Short 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