Can you call a function within a list python?

By On Friday, October 7th, 2022 Categories : Tanya Jawab

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After a function is defined, you can use it from outside the function by calling it’s name followed by the parenthesis with necessary input argument values.

function_name(p1_value, p2_value...)`

Actually we’ve been using this already. When we need to run the code in a function, we need to do function call. Function call contains the name of the function to be executed followed by a list of values, called arguments, which are assigned to
the parameters in the function definition.

Using the specified function name anywhere in your program and any number of times, you can run that block of code.

Call the Function directly to run the code in it.

After the function definition, we call the function say_hi() to run it:

def say_hi():
    print('Hi!')

say_hi()

The last line is not indented means this is out of the function already, we simply type the function name with the empty parenthesis since this function
has no input arguments. By clicking the run button, we can see the result is displayed in the code console:

Hi!

Call the function in some lines of codes

Let’s continue with the above lines,


for t in range(3):
    print(t)
    say_hi()

Console result:

1
Hi!
2
Hi!
3
Hi!

These few lines of statements use for loop to call the function say_hi() 3 times: at t=0,1,2, each time t is printed out before calling say_hi(), so the console shows the above message.

We can call the
function say_hi() in another function definition:

# continue with the above lines
def say_morning():
    say_hi()
    print('Good morning!')

say_morning()     # call the function

Here we start to define another function say_morning(), in this function there are two lines of statements: call function say_hi() and print another message. no more indented lines after print, so this is the end of function say_morning().

Next we call the function say_morning() on the last line with no indention, click run, the codes in the function body first execute another function say_hi(), then execute next print
statement, see the result in the console:

Hi!
Good morning!

Exercise:

Please define a function, sing(), call this function to print out a message: Happy birthday to you!

def sing():
    print('Happy birthday to you!`)

# call function
sing()

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What is Function in Python?

A Function in Python is a piece of code which runs when it is referenced. It is used to utilize the code in more than one place in a program. It is also called method or procedure. Python provides many inbuilt functions like print(), input(), compile(), exec(), etc. but it also gives freedom to create your own functions.

Function in Python is defined by
the “def ” statement followed by the function name and parentheses ( () )

Example:

Let us define a function by using the command ” def func1():” and call the function. The output of the function will be “I am learning Python function”.

The function print func1() calls our def func1(): and print the command ” I am learning Python function None.

There are set of rules in Python to define a function.

  • Any args or input parameters should be placed within these parentheses
  • The function first statement can be an optional statement- docstring or the documentation string of the function
  • The
    code within every function starts with a colon (:) and should be indented (space)
  • The statement return (expression) exits a function, optionally passing back a value to the caller. A return statement with no args is the same as return None.

Significance of Indentation (Space) in Python

Before we get familiarize with Python functions, it is important that we
understand the indentation rule to declare Python functions and these rules are applicable to other elements of Python as well like declaring conditions, loops or variable.

Python follows a particular style of indentation to define the code, since Python functions don’t have any explicit begin or end like curly braces to indicate the start and stop for the function, they have to rely on this indentation. Here we take a simple example with “print” command. When we write
“print” function right below the def func 1 (): It will show an “indentation error: expected an indented block“.

Now, when you add the indent (space) in front of “print” function, it should print as
expected.

At least, one indent is enough to make your code work successfully. But as a best practice it is advisable to leave about 3-4 indent to call your function.

It is also necessary that while
declaring indentation, you have to maintain the same indent for the rest of your code. For example, in below screen shot when we call another statement “still in func1” and when it is not declared right below the first print statement it will show an indentation error “unindent does not match any other indentation level.”

Now, when we apply same indentation for both the statements and align them in the same line, it gives the expected output.

How Function Return Value?

Return command in Python specifies what value to give back to the caller of the function.
Let’s understand this with the following example

Step 1) The function does not return anything

Here – we see when function is not “return”. For example, we want the square of 4, and it should give answer “16” when the code is executed. Which it gives when we simply use “print x*x” code, but when you call function “print square” it gives “None” as an output. This is because when you call the function, recursion does not happen and fall off the end of the function.
Python returns “None” for failing off the end of the function.

Step 2) Replace the print command with assignment command

To make this clearer we replace the print command with assignment command. Let’s
check the output.

When you run the command “print square (4)” it actually returns the value of the object since we don’t have any specific function to run over here it returns “None”.

Step 3) Use ‘return’
function and execute the code

Now, here we will see how to retrieve the output using “return” command. When you use the “return” function and execute the code, it will give the output “16.”

Step 4) Run
the command ‘print square’

Functions in Python are themselves an object, and an object has some value. We will here see how Python treats an object. When you run the command “print square” it returns the value of the object. Since we have not passed any argument, we don’t have any specific function to run over here it returns a default value (0x021B2D30) which is the location of the object. In practical Python program, you probably won’t ever need to do this.

Arguments in Functions

The argument is a value that is passed to the function when it’s called.

In other
words on the calling side, it is an argument and on the function side it is a parameter.

Let see how Python Args works –

Step 1) Arguments are declared in the function definition. While calling the function, you can pass the values for that args as shown below

Step 2) To declare a default value of an argument, assign it a value at function definition.

Example: x has no default values. Default values of y=0. When we supply only one argument while calling multiply function, Python assigns the supplied value to x while keeping the value of y=0. Hence the multiply of x*y=0

Step 3) This time we will change the value to y=2 instead of the default value y=0, and it will return the output as (4×2)=8.

Step 4) You can also change the order in which the arguments can be passed in Python. Here we have reversed the order of the value x and y to x=4 and y=2.

Step 5) Multiple Arguments can also be passed as an array. Here in the example we call the multiple args (1,2,3,4,5) by calling the (*args) function.

Example: We declared multiple args as number
(1,2,3,4,5) when we call the (*args) function; it prints out the output as (1,2,3,4,5)

Tips:

  • In Python 2.7. function overloading is not supported in Python. Function Overloading
    is the ability to create multiple methods of the same name with a different implementation. Function Overloading is fully supported in Python 3
  • There is quite a confusion between methods and functions. Methods in Python are associated with object instances while function are not. When Python calls a method, it binds the first parameter of that call to the appropriate object reference. In simple words, a standalone function in Python is a “function”, whereas a function that is an
    attribute of a class or an instance is a “method”.

Here is the complete Python 3 code

#define a function
def func1():
   print ("I am learning Python function")
   print ("still in func1")
   
func1()

def square(x):
  	return x*x
print(square(4))

def multiply(x,y=0):
	print("value of x=",x)
	print("value of y=",y)
    
	return x*y
  
print(multiply(y=2,x=4))

Here is the complete Python 2 code

#define a function
def func1():
   print " I am learning Python function"
   print " still in func1"
   
func1()

def square(x):
  	return x*x
print square(4)

def multiply(x,y=0):
	print"value of x=",x
	print"value of y=",y
    
	return x*y
  
print multiply(y=2,x=4)

Summary:

Function in Python is a piece of reusable code that is used to perform single, related action. In this article, we will see

  • Function defined by the def statement
  • The code block within every function starts with a colon (:) and should be indented (space)
  • Any arguments or input
    parameters should be placed within these parentheses, etc.
  • At least one indent should be left before the code after declaring function
  • Same indent style should be maintained throughout the code within def function
  • For best practices three or four indents are considered best before the statement
  • You can use the “return” command to return values to the function call.
  • Python will print a random value like (0x021B2D30) when the argument is not supplied to the
    calling function. Example “print function.”
  • On the calling side, it is an argument and on the function side it is a parameter
  • Default value in argument – When we supply only one argument while calling multiply function or any other function, Python assigns the other argument by default
  • Python enables you to reverse the order of the argument as well

Can we call a function inside a list in Python?

You can create the functions in the original scope, assign them to the array and then delete them from their original scope. Thus, you can indeed call them from the array but not as a local variable.

How do I call a function in a list Python?

Just add return wordlist to the function. Adding a return statement in a function returns the object whenever the function is called appropriately and you can store that returned variable in a global scope variable.

Can you put a call function in a list?

At the simplest level, you can simply use tuples for referencing function calls. For example, a call to func1(a, b, c) would be referenced by the tuple (func1, a, b, c) . You can then safely put those tuples in a list. That is : call the function in t[0] with the arguments in the remaining of typle.

Can a function be in an array Python?

Introduction to Python Array Functions. Array functions in python are defined as functions that will have arrays as parameters to the function and perform set of instructions to perform a particular task on input parameters to achieve a particular task is called array functions in python.

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