Min () function in Python

The built-in min () function in Python returns the smallest element in an iterable or smallest of passed parameters.

If the values are strings, they will compare alphabetically.

So, how does the syntax of min () function work, what parameters and how does it work? Invites you to read the track.

The syntax of min () function in Python

The min () function in Python has two forms:

 min(iterable, *iterables[,key, default])

Or:

 min(item1, item2, *item[, key])

Parameters of min function ()

The min () function works with two types of parameters corresponding to the two syntaxes mentioned above:

1. min(iterable, *iterables[, key, default])

iterable : Required. The tuples, string, set, dictionary or iterator objects that you need to find the smallest element in.
*iterables : Optional. The smallest Iterable will be returned.
key : Optional. Key function, where the iterable goes through. Comparisons are made based on the results returned after passing the key function.
default : Optional. The default value when iterable is empty.

2. min(item1, item2, *item[, key])

item1 , item2 : Required. Object to compare, can be number, string .
*item : Optional. Other objects for comparison.
At least two objects are needed to make comparisons with the min () function.
key : Optional. Key function, where items pass. The comparison is performed on the result returned after passing the key function.

Return value from min ()

The min () function returns different results corresponding to the two types as above:

1. min(iterable, *iterables[, key, default])

Case

Key

Default

Return value

Iterable empty Yes or No No Exception Exception ValueError Iterable blank Yes Yes Returns Default value An iterable (not empty) No or No Returns the smallest number in iterable One iterable (blank) Yes or No Transmission each element in iterable for the key function, the result returned is the smallest element based on the return value from the key function Multiple iterable (not empty) No Yes or No Returns iterable smallest Multiple iterable (not empty) Yes Yes or Don't pass each iterable to the key function. The result returned is the smallest iterable based on the value returned from the key function

2. min(item1, item2, *item[, key])

Case

Key

Return value

2 item No Return parameter smaller than 2 item Yes Pass each parameter for the key function, the result returned is smaller element based on the return value from the key function Many items No Returns the smallest parameter Many items Yes Pass each parameter to the key function, the result returned is the smallest element based on the value returned from the key function

Example 1: Find the smallest element in the number passed

 # su dung min(item1, item2, *item) print('So nho nhat la:', min(1, 3, 2, 5, 4)) # su dung min(iterable) num = [1, 3, 2, 8, 5, 10, 6] print('So nho nhat la:', min(num))

Run the program, the result is:

 So nho nhat la: 1 So nho nhat la: 2

Example 2: Find the number that has the smallest number of digits using the key function

 def sumDigit(num): sum = 0 while(num): sum += num % 10 num = int(num / 10) return sum # su dung min(item1, item2, *item, key) print('Ket qua nho nhat la:', min(100, 321, 267, 59, 40, key=sumDigit)) # su dung min(iterable, key) num = [15, 300, 2700, 821, 52, 10, 6] print('Ket qua nho nhat la:', min(num, key=sumDigit))

The return output is:

 Ket qua nho nhat la: 100 Ket qua nho nhat la: 10

In this example, the parameters or each element in the iterable parameter are passed in turn to sumDigit() to get the result that the number has the smallest sum of digits.

Example 3: Find the list with the smallest length using the key function

 num = [15, 300, 2700, 821] num1 = [12, 2] num2 = [34, 567, 78] # su dung min(iterable, *iterables, key) print('List ngan nhat la:', min(num, num1, num2, key=len))

Results returned:

 List ngan nhat la: [12, 2]

In the above program, iterable num, num1 and num2 passed into the key function are built-in len () functions in Python. The result is iterable, and the min () function will iterable with the smallest length.

You should read it

May be interested

The function set () in Python
in this article, tipsmake.com will learn with you about set (), syntax, parameters and specific examples. invites you to read the track.
Help () function in Python
the built-in help () function in python is used to display documents and invoke the help system of modules, functions, classes, keywords ...
Sum () function in Python
the built-in function sum () in python returns the sum of all numbers in iterable.
The slice () function in Python
the slice () function in python returns a slice object that helps you determine how to cut an existing string.
The chr () function in Python
in python, the chr () function returns a character (a string) from an integer that represents the unicode of the returned character.
The iter () function in Python
continuing with the topic of python's built-in functions, the article will introduce you to the iter () function with the syntax, usage as well as specific examples. invites you to read the track.
The pow () function in Python
the pow () function built into python returns the value of x with the power of y (xy). if there is a third parameter, the function returns x to the power y, the module z.
The reversed () function in Python
the reversed () function is one of the built-in functions in python, used to reverse the original string returning the iterator.
Exec () function in Python
the exec () function used to execute python programs dynamically can be string or object code. how does exec () function syntax, what parameters do it have, and how is it used? invites you to read the track.
Built-in Python functions
in the previous article, you learned that python has a basic function type, one is a built-in function, two are user-defined functions. today, we will learn about a list of python's built-in functions.