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Python Functions
Python functions allow for reusable code through defining functions, passing arguments, returning values, and setting scopes. Functions can take positional or keyword arguments, as well as variable length arguments. Default arguments allow functions to specify default values for optional parameters. Functions are objects that can be assigned to variables and referenced later.
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Overview of defining and using functions, including arguments, return values, and reusability.
Covers built-in functions, syntax for defining functions, and how to call them with parameters.
Demonstration of user-defined functions like the square function, including examples of returning multiple values.
Discussion on variable scope and lifetime within functions, explaining local scope and memory management.
Explanation of default arguments, including default value assignments, mandatory vs optional parameters.
Clarification on keyword arguments, and the order rules for positional and keyword arguments.
Introduction to functions that can accept a variable number of arguments.
Describes how functions can be treated as objects - assigned, reassigned, and referenced.
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Python Functions
- 1.Python Functions● Definefunctions● Passing arguments to Function● Return a value from function● Scope of Objects● Default arguments● Positional and keyword arguments● Variable length arguments
- 2.Functions Piece ofreusable code Solves particular task Call function instead of writing codeyourself
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- 4.Syntax of FunctionMohammedSikander 4
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- 6.Function Call Oncewe have defined a function, we can call itfrom another function, program or even the Pythonprompt. To call a function we simply type the function namewith appropriate parameters.Calling the Functionmy_function()
- 7.Square function:Take oneargumentsand prints its square
- 8.Square function:Take oneargumentsand returns its square
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- 10.Scope and Lifetimeofvariables Scope of a variable is the portion of a program where thevariable is recognized. Parameters and variables defined inside a function is not visiblefrom outside. Hence, they have a local scope. Lifetime of a variable is the period throughout which the variableexits in the memory. The lifetime of variables inside a function isas long as the function executes. They are destroyed once we return from the function. Hence, afunction does not remember the value of a variable from itsprevious calls.
- 14.Default Arguments Functionarguments can have default values inPython. We can provide a default value to an argument byusing the assignment operator (=).
- 15.Default Arguments Inthis function, theparameter amount does not have a defaultvalue and is required (mandatory) during acall. On the other hand, the parameterdiscountPercentage has a default valueof 0. So, it is optional during a call. If a value is provided, it will overwrite thedefault value. Any number of arguments in a function canhave a default value.
- 16.Default Arguments Oncewe have a default argument, allthe arguments to its right must alsohave default values. SyntaxError: non-default argumentfollows default argument
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- 18. Positional argumentcannot followkeyword argument
- 19.Variable number ofarguments
- 20.Functions as Objects●Although functions are created differently from normalvariables, functions are just like any other kind of value.● They can be assigned and reassigned to variables, and laterreferenced by those names.