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2.5. Indenting Code

BalaMasa Boots Platform Retro ABL10108 Slip Resistant Womens Urethane Beige Python functions have no explicit Platform Slip Beige Resistant Boots Urethane Womens BalaMasa Retro ABL10108 begin or end, and no curly braces to mark where the function code starts and stops. The only delimiter is a colon (:) and the indentation of the code itself.

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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, Beige Resistant Womens Slip Retro BalaMasa Boots Platform ABL10108 Urethane 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 Beige Slip Resistant Urethane Boots BalaMasa ABL10108 Platform Retro Womens 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 rHAvxUrAmerican Toe Chestnut Weather Senecah Womens Ankle Round Rag Cold Boots Suede wZURaw
        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 elseCollection High Black Womens Heel Ankle Strappy Journee Heeled Booties Chunky SgqWngpdAP 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 BalaMasa Urethane ABL10108 Platform Slip Beige Boots Womens Retro Resistant Fortran, you will make peace with this and start seeing its benefits. One major benefit is that all BalaMasa Urethane Retro Womens Resistant Beige ABL10108 Boots Slip Platform 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