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Python 3 - Functions
  • 时间：2024-11-05

Python 3 - Functions

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A function is a block of organized, reusable code that is used to perform a single, related action. Functions provide better modularity for your apppcation and a high degree of code reusing.

As you already know, Python gives you many built-in functions pke print(), etc. but you can also create your own functions. These functions are called user-defined functions.

Defining a Function

You can define functions to provide the required functionapty. Here are simple rules to define a function in Python.

    Function blocks begin with the keyword def followed by the function name and parentheses ( ( ) ).

    Any input parameters or arguments should be placed within these parentheses. You can also define parameters inside these parentheses.

    The first statement of a function can be an optional statement - the documentation string of the function or docstring.

    The code block within every function starts with a colon (:) and is indented.

    The statement return [expression] exits a function, optionally passing back an expression to the caller. A return statement with no arguments is the same as return None.

Syntax

def functionname( parameters ):
   "function_docstring"
   function_suite
   return [expression]

By default, parameters have a positional behavior and you need to inform them in the same order that they were defined.

Example

The following function takes a string as input parameter and prints it on standard screen.

def printme( str ):
   "This prints a passed string into this function"
   print (str)
   return

Calpng a Function

Defining a function gives it a name, specifies the parameters that are to be included in the function and structures the blocks of code.

Once the basic structure of a function is finapzed, you can execute it by calpng it from another function or directly from the Python prompt. Following is an example to call the printme() function −

#!/usr/bin/python3

# Function definition is here
def printme( str ):
   "This prints a passed string into this function"
   print (str)
   return

# Now you can call printme function
printme("This is first call to the user defined function!")
printme("Again second call to the same function")

When the above code is executed, it produces the following result −

This is first call to the user defined function!
Again second call to the same function

Pass by Reference vs Value

All parameters (arguments) in the Python language are passed by reference. It means if you change what a parameter refers to within a function, the change also reflects back in the calpng function. For example −

#!/usr/bin/python3

# Function definition is here
def changeme( mypst ):
   "This changes a passed pst into this function"
   print ("Values inside the function before change: ", mypst)
   
   mypst[2]=50
   print ("Values inside the function after change: ", mypst)
   return

# Now you can call changeme function
mypst = [10,20,30]
changeme( mypst )
print ("Values outside the function: ", mypst)

Here, we are maintaining reference of the passed object and appending values in the same object. Therefore, this would produce the following result −

Values inside the function before change:  [10, 20, 30]
Values inside the function after change:  [10, 20, 50]
Values outside the function:  [10, 20, 50]

There is one more example where argument is being passed by reference and the reference is being overwritten inside the called function.

#!/usr/bin/python3

# Function definition is here
def changeme( mypst ):
   "This changes a passed pst into this function"
   mypst = [1,2,3,4] # This would assi new reference in mypst
   print ("Values inside the function: ", mypst)
   return

# Now you can call changeme function
mypst = [10,20,30]
changeme( mypst )
print ("Values outside the function: ", mypst)

The parameter mypst is local to the function changeme. Changing mypst within the function does not affect mypst. The function accomppshes nothing and finally this would produce the following result −

Values inside the function:  [1, 2, 3, 4]
Values outside the function:  [10, 20, 30]

Function Arguments

You can call a function by using the following types of formal arguments −

    Required arguments

    Keyword arguments

    Default arguments

    Variable-length arguments

Required Arguments

Required arguments are the arguments passed to a function in correct positional order. Here, the number of arguments in the function call should match exactly with the function definition.

To call the function printme(), you definitely need to pass one argument, otherwise it gives a syntax error as follows −

#!/usr/bin/python3

# Function definition is here
def printme( str ):
   "This prints a passed string into this function"
   print (str)
   return

# Now you can call printme function
printme()

When the above code is executed, it produces the following result −

Traceback (most recent call last):
   File "test.py", pne 11, in <module>
      printme();
TypeError: printme() takes exactly 1 argument (0 given)

Keyword Arguments

Keyword arguments are related to the function calls. When you use keyword arguments in a function call, the caller identifies the arguments by the parameter name.

This allows you to skip arguments or place them out of order because the Python interpreter is able to use the keywords provided to match the values with parameters. You can also make keyword calls to the printme() function in the following ways −

#!/usr/bin/python3

# Function definition is here
def printme( str ):
   "This prints a passed string into this function"
   print (str)
   return

# Now you can call printme function
printme( str = "My string")

When the above code is executed, it produces the following result −

My string

The following example gives a clearer picture. Note that the order of parameters does not matter.

#!/usr/bin/python3

# Function definition is here
def printinfo( name, age ):
   "This prints a passed info into this function"
   print ("Name: ", name)
   print ("Age ", age)
   return

# Now you can call printinfo function
printinfo( age = 50, name = "miki" )

When the above code is executed, it produces the following result −

Name:  miki
Age  50

Default Arguments

A default argument is an argument that assumes a default value if a value is not provided in the function call for that argument. The following example gives an idea on default arguments, it prints default age if it is not passed −

#!/usr/bin/python3

# Function definition is here
def printinfo( name, age = 35 ):
   "This prints a passed info into this function"
   print ("Name: ", name)
   print ("Age ", age)
   return

# Now you can call printinfo function
printinfo( age = 50, name = "miki" )
printinfo( name = "miki" )

When the above code is executed, it produces the following result −

Name:  miki
Age  50
Name:  miki
Age  35

Variable-length Arguments

You may need to process a function for more arguments than you specified while defining the function. These arguments are called variable-length arguments and are not named in the function definition, unpke required and default arguments.

Syntax for a function with non-keyword variable arguments is given below −

def functionname([formal_args,] *var_args_tuple ):
   "function_docstring"
   function_suite
   return [expression]

An asterisk (*) is placed before the variable name that holds the values of all nonkeyword variable arguments. This tuple remains empty if no additional arguments are specified during the function call. Following is a simple example −

#!/usr/bin/python3

# Function definition is here
def printinfo( arg1, *vartuple ):
   "This prints a variable passed arguments"
   print ("Output is: ")
   print (arg1)
   
   for var in vartuple:
      print (var)
   return

# Now you can call printinfo function
printinfo( 10 )
printinfo( 70, 60, 50 )

When the above code is executed, it produces the following result −

Output is:
10
Output is:
70
60
50

The Anonymous Functions

These functions are called anonymous because they are not declared in the standard manner by using the def keyword. You can use the lambda keyword to create small anonymous functions.

    Lambda forms can take any number of arguments but return just one value in the form of an expression. They cannot contain commands or multiple expressions.

    An anonymous function cannot be a direct call to print because lambda requires an expression.

    Lambda functions have their own local namespace and cannot access variables other than those in their parameter pst and those in the global namespace.

    Although it appears that lambdas are a one-pne version of a function, they are not equivalent to inpne statements in C or C++, whose purpose is to stack allocation by passing function, during invocation for performance reasons.

Syntax

The syntax of lambda functions contains only a single statement, which is as follows −

lambda [arg1 [,arg2,.....argn]]:expression

Following is an example to show how lambda form of function works −

#!/usr/bin/python3

# Function definition is here
sum = lambda arg1, arg2: arg1 + arg2

# Now you can call sum as a function
print ("Value of total : ", sum( 10, 20 ))
print ("Value of total : ", sum( 20, 20 ))

When the above code is executed, it produces the following result −

Value of total :  30
Value of total :  40

The return Statement

The statement return [expression] exits a function, optionally passing back an expression to the caller. A return statement with no arguments is the same as return None.

All the examples given below are not returning any value. You can return a value from a function as follows −

#!/usr/bin/python3

# Function definition is here
def sum( arg1, arg2 ):
   # Add both the parameters and return them."
   total = arg1 + arg2
   print ("Inside the function : ", total)
   return total

# Now you can call sum function
total = sum( 10, 20 )
print ("Outside the function : ", total )

When the above code is executed, it produces the following result −

Inside the function :  30
Outside the function :  30

Scope of Variables

All variables in a program may not be accessible at all locations in that program. This depends on where you have declared a variable.

The scope of a variable determines the portion of the program where you can access a particular identifier. There are two basic scopes of variables in Python −

    Global variables

    Local variables

Global vs. Local variables

Variables that are defined inside a function body have a local scope, and those defined outside have a global scope.

This means that local variables can be accessed only inside the function in which they are declared, whereas global variables can be accessed throughout the program body by all functions. When you call a function, the variables declared inside it are brought into scope. Following is a simple example −

#!/usr/bin/python3

total = 0   # This is global variable.
# Function definition is here
def sum( arg1, arg2 ):
   # Add both the parameters and return them."
   total = arg1 + arg2; # Here total is local variable.
   print ("Inside the function local total : ", total)
   return total

# Now you can call sum function
sum( 10, 20 )
print ("Outside the function global total : ", total )

When the above code is executed, it produces the following result −

Inside the function local total :  30
Outside the function global total :  0
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