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Functions are a means by which we can package up and parameterize functionality Four kinds of functions can be created in Python: global functions, local functions, lambda functions, and methods Every function we have created so far has been a global function Global objects (including functions) are accessible to any code in the same module (ie, the same py le) in which the object is created Global objects can also be accessed from other modules, as we will see in the next chapter Local functions (also called nested functions) are functions that are de ned inside other functions These functions are visible only to the function where they are de ned; they are especially useful for creating small helper functions that have no use elsewhere We rst show them in 7

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Although this book provides solid coverage of the Python 3 language and the built-in functions and most commonly used modules in the standard library, Python s online documentation provides a considerable amount of reference documentation, both on the language, and particularly on Python s extensive standard library The documentation is available online at docspythonorg and is also provided with Python itself On Windows the documentation is supplied in the Windows help le format Click Start All Programs Python 3x Python Manuals to launch the Windows help browser This tool has both an Index and a Search function that makes nding documentation easy Unix users have the documentation in HTML format In addition to the hyperlinks, there are various index pages There is also a very convenient Quick Search function available on the left-hand side of each page The most frequently used online document for new users is the Library Reference, and for experienced users the Global Module Index Both of these have links to pages covering Python s entire standard library and in the case of the Library Reference, links to pages covering all of Python s built-in functionality as well It is well worth skimming through the documentation, particularly the Library Reference or the Global Module Index, to see what Python s standard library offers, and clicking through to the documentation of whichever topics are of interest This should provide an initial impression of what is available and should also help you to establish a mental picture of where you can nd the documentation you are interested in (A brief summary of Python s standard library is provided in 5) Help is also available from the interpreter itself If you call the builtin help() function with no arguments, you will enter the online help system simply follow the instructions to get the information you want, and type q or quit to return to the interpreter If you know what module or data type you want help on, you can call help() with the module or data type as its argument For example, help(str) provides information on the str data type, including all of its methods, help(dictupdate) provides information on the dict collection data type s update() method, and help(os) displays information about the os module (providing it has been imported) Once familiar with Python, it is often suf cient to just be reminded about what attributes (eg, what methods) a data type provides This information is available using the dir() function for example, dir(str) lists all the string methods, and dir(os) lists all the os module s constants and functions (again, providing the module has been imported).

Lambda functions are expressions, so they can be created at their point of use; however, they are much more limited than normal functions Methods are functions that are associated with a particular data type and can be used only in conjunction with the data type they are introduced in 6 when we cover object-oriented programming Python provides many built-in functions, and the standard library and thirdparty libraries add hundreds more (thousands if we count all the methods), so in many cases the function we want has already been written For this reason, it is always worth checking Python s online documentation to see what is already available See the sidebar Online Documentation (172 ) The general syntax for creating a (global or local) function is:

The parameters are optional, and if there is more than one they are written as a sequence of comma-separated identi ers, or as a sequence of identifier=value pairs as we will discuss shortly For example, here is a function that calculates the area of a triangle using Heron s formula:

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def heron(a, b, c): s = (a + b + c) / 2 return mathsqrt(s * (s - a) * (s - b) * (s - c))

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