Einführung

Der Python Die Return-Anweisung wird verwendet, um einen Wert von einer Funktion zurückzugeben. Der Benutzer kann die Return-Anweisung nur in einer Funktion verwenden. Es kann nicht außerhalb der Python-Funktion verwendet werden. Eine Return-Anweisung enthält das Schlüsselwort return und den Wert, der danach zurückgegeben wird.

Syntax der Return-Anweisung:

 def funtion_name(): statements . . . return [expression] 

Programm 1

 def adding(x, y): i = x + y return i result = adding(16, 25) print(f'Output of adding(16, 25) function is {result}') 

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Programm 2

 def adding(a, b): # this function is return the value of (a + b) return a + b def boolean_function(a): # this function is return the Boolean value return bool(a) # calling function flag = adding(2, 3) print(&apos;Output of first function is {}&apos;.format(flag)) flag = boolean_function(9 <5) print('
output of second function is {}'.format(flag)) < pre> <p> <strong>Output.</strong> </p> <img src="//techcodeview.com/img/python-tutorial/18/python-return-statement-2.webp" alt="Python return statement"> <h3>Returning Multiple Values</h3> <p>In the Python programming language, a user can return multiple values from a function. The following are the various methods for this.</p> <p> <strong>1. Using Object:</strong> This method is similar to <a href="/c-programming-language-tutorial">C</a> / <a href="/c-tutorial">C ++</a> and <a href="/java-tutorial">Java</a> . A user can create a class to hold multiple values in a function and return an object of that class.</p> <pre> class a: def __init__(self): self.omg = &apos;javatpoint is the best website to learn&apos; self.i = 122 # This function will return an object of the class a def test(): return a() # Driver code to test the above method z = test() print(z.omg) print(z.i) </pre> <p> <strong>Output</strong> </p> <img src="//techcodeview.com/img/python-tutorial/18/python-return-statement-3.webp" alt="Python return statement"> <p> <strong>2. Using Tuple:</strong> The tuple is similar to a list, but there is a slight difference between tuple and list. In the tuple, the object values cannot be changed, while the object value can be changed in the list.</p> <pre> def test(): omg = &apos;javatpoint is the best website to learn&apos; i = 122 return omg, i; # Return tuple, we could also. # Driver code to test the above method. omg, i = test() # Assign return tuple print(omg) print(i) </pre> <p> <strong>Output</strong> </p> <img src="//techcodeview.com/img/python-tutorial/18/python-return-statement-4.webp" alt="Python return statement"> <p> <strong>3. Using list:</strong> The list is similar to the dynamically sized array. In the list, the user can store everything in a single variable.</p> <pre> def test(): omg = &apos;javatpoint&apos; i = 122 return [omg, i]; # Driver code to test the above method list = test() print(list) </pre> <p> <strong>Output</strong> </p> <img src="//techcodeview.com/img/python-tutorial/18/python-return-statement-5.webp" alt="Python return statement"> <p> <strong>4. Using dictionary:</strong> In the Python language, a dictionary is a collection of unstructured items that are used to store data values such as hash or map.</p> <pre> def test(): a = dict(); a[&apos;omg&apos;] = &apos;javatpoint&apos; a[&apos;i&apos;] = 122 return a # Driver code to test the above method a = test() print(a) </pre> <p> <strong>Output</strong> </p> <img src="//techcodeview.com/img/python-tutorial/18/python-return-statement-6.webp" alt="Python return statement"> <p> <strong>5. Using Data Class (Python 3.7+)</strong> </p> <pre> from dataclasses import dataclass @dataclass class Book_list: bookname: str cost: float quantity_of_book_available: int = 0 # This function is used to calculate the total cost of the books def total_cost_of_book(self) -&gt; float: return self.cost * self.quantity_of_book_available book = Book_list(&apos;Python programming language.&apos;, 499, 10) i = book.total_cost_of_book() # print the total cost print(i) # print the details of the book print(book) </pre> <p> <strong>Output</strong> </p> <img src="//techcodeview.com/img/python-tutorial/18/python-return-statement-7.webp" alt="Python return statement"> <h3>Function returning another function</h3> <p>In the Python programming language, a function is in the form of an object. Therefore, the user can return a function from another function.</p> <p>In the below program, The first_add function returns the second_add function.</p> <pre> def first_add(x): def second_add(y): return x + y return second_add i = first_add(20) print(&apos;The value of x + y is&apos;, i(10)) # second function def outer_func(x): return x * 5 def func(): # return the value in the different function return outer_func # storing the function in z z = func() print(&apos;
The value of x * y is&apos;, z(10)) </pre> <p> <strong>Output</strong> </p> <img src="//techcodeview.com/img/python-tutorial/18/python-return-statement-8.webp" alt="Python return statement"> <hr></5)>

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Java-Listenzeichenfolge

2. Tupel verwenden: Das Tupel ähnelt einer Liste, es gibt jedoch einen kleinen Unterschied zwischen Tupel und Liste. Im Tupel können die Objektwerte nicht geändert werden, während der Objektwert in der Liste geändert werden kann.

 def test(): omg = 'javatpoint is the best website to learn' i = 122 return omg, i; # Return tuple, we could also. # Driver code to test the above method. omg, i = test() # Assign return tuple print(omg) print(i) 

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3. Verwendung der Liste: Die Liste ähnelt dem Array mit dynamischer Größe. In der Liste kann der Benutzer alles in einer einzigen Variablen speichern.

 def test(): omg = 'javatpoint' i = 122 return [omg, i]; # Driver code to test the above method list = test() print(list) 

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Letztes Zeichen aus der Zeichenfolge entfernen

4. Wörterbuch verwenden: In der Python-Sprache ist ein Wörterbuch eine Sammlung unstrukturierter Elemente, die zum Speichern von Datenwerten wie Hash oder Map verwendet werden.

 def test(): a = dict(); a['omg'] = 'javatpoint' a['i'] = 122 return a # Driver code to test the above method a = test() print(a) 

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5. Verwenden der Datenklasse (Python 3.7+)

 from dataclasses import dataclass @dataclass class Book_list: bookname: str cost: float quantity_of_book_available: int = 0 # This function is used to calculate the total cost of the books def total_cost_of_book(self) -> float: return self.cost * self.quantity_of_book_available book = Book_list('Python programming language.', 499, 10) i = book.total_cost_of_book() # print the total cost print(i) # print the details of the book print(book) 

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Funktion, die eine andere Funktion zurückgibt

In der Programmiersprache Python liegt eine Funktion in Form eines Objekts vor. Daher kann der Benutzer eine Funktion von einer anderen Funktion zurückgeben.

Im folgenden Programm gibt die Funktion „first_add“ die Funktion „second_add“ zurück.

 def first_add(x): def second_add(y): return x + y return second_add i = first_add(20) print('The value of x + y is', i(10)) # second function def outer_func(x): return x * 5 def func(): # return the value in the different function return outer_func # storing the function in z z = func() print('
The value of x * y is', z(10)) 

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