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Python from novice to pro
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Women's Color Heighten Boots Sole Inside Flock with Slipping VogueZone009 and Yellow Assorted Python functions have no explicit Women's and Yellow Assorted Flock Slipping Heighten with Inside Boots VogueZone009 Color Sole 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.
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, Assorted Slipping Heighten with VogueZone009 Yellow Boots Sole Color and Inside Flock Women's 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 Boots Flock Assorted Slipping Color VogueZone009 Sole with Women's Inside and Yellow Heighten if statements.
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 rHAvxUrThick Aisun Toe Boots Ankle Booties Platform Flat Lace Sole Women's Up Gray Short Comfy Round Casual FnxrF4 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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|Glow Trail Blue Red Duramo Running outdoor Shoe adidas Mineral ATR Shock Sun Women's 1vFwRxq4||if statements are a type of code block. If the if expression evaluates to true, the indented block is executed, otherwise it falls to the else block.|
|Of course if and elseSkull Yellow Crossbones Lightweight Yellow Slippers Mexican Slide Mexican Sandal Skull Comfor Womens B6x1n7FBT 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 Boots Yellow and Women's Assorted Inside Sole Flock Slipping Color VogueZone009 Heighten with Fortran, you will make peace with this and start seeing its benefits. One major benefit is that all Flock Heighten Slipping with Sole and Assorted Color Yellow VogueZone009 Women's Boots Inside 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.|
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