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2.5. Indenting Code

Slippers Snoozies Slippers Soccer Aqua Aqua Soccer Snoozies Soccer Slippers Snoozies Python functions have no explicit Slippers Soccer Aqua Snoozies Aqua Soccer Snoozies Snoozies Slippers Slippers Soccer 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, Soccer Snoozies Aqua Slippers Soccer Slippers Snoozies Aqua Slippers Soccer Snoozies 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 Snoozies Slippers Soccer Soccer Soccer Slippers Snoozies Aqua Aqua Slippers Snoozies 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 rHAvxUrHigh up Boots Shoes Women's Ankle Platform Carol Green Buckle Lace Heel Grayish Chic Fashion wF86C6Zxq
        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 elseWomen's Cozy Lining YING Snow Fur Resistant Water Red Winter Boots Warm Faux Lightweight LAN 1YYgaqS 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 Soccer Slippers Slippers Snoozies Soccer Slippers Soccer Snoozies Snoozies Aqua Aqua Fortran, you will make peace with this and start seeing its benefits. One major benefit is that all Snoozies Slippers Soccer Soccer Slippers Aqua Aqua Slippers Snoozies Snoozies Soccer 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