A return statement is used to end the execution of the function call and “returns” the result (value of the expression following the return keyword) to the caller. The statements after the return statements are not executed. If the return statement is without any expression, then the special value None is returned. A return statement is overall used to invoke a function so that the passed statements can be executed.
Note: Return statement can not be used outside the function.
Syntax:
def fun(): statements . . return [expression]
Example:
def cube(x): r=x**3 return r
Example:
Tóm Tắt
Python3
def
add(a, b):
return
a
+
b
def
is_true(a):
return
bool
(a)
res
=
add(
2
,
3
)
print
(
"Result of add function is {}"
.
format
(res))
res
=
is_true(
2
<
5
)
print
(
"\nResult of is_true function is {}"
.
format
(res))
Output:
Result of add function is 5 Result of is_true function is True
Returning Multiple Values
In Python, we can return multiple values from a function. Following are different ways.
- Using Object: This is similar to C/C++ and Java, we can create a class (in C, struct) to hold multiple values and return an object of the class.
Example
Python3
class
Test:
def
__init__(
self
):
self
.
str
=
"geeksforgeeks"
self
.x
=
20
def
fun():
return
Test()
t
=
fun()
print
(t.
str
)
print
(t.x)
Output
geeksforgeeks 20
- Using Tuple: A Tuple is a comma separated sequence of items. It is created with or without (). Tuples are immutable. See this for details of tuple.
Python3
def
fun():
str
=
"geeksforgeeks"
x
=
20
return
str
, x;
str
, x
=
fun()
print
(
str
)
print
(x)
- Output:
geeksforgeeks 20
- Using a list: A list is like an array of items created using square brackets. They are different from arrays as they can contain items of different types. Lists are different from tuples as they are mutable. See this for details of list.
Python3
def
fun():
str
=
"geeksforgeeks"
x
=
20
return
[
str
, x];
list
=
fun()
print
(
list
)
- Output:
['geeksforgeeks', 20]
- Using a Dictionary: A Dictionary is similar to hash or map in other languages. See this for details of dictionary.
Python3
def
fun():
d
=
dict
();
d[
'str'
]
=
"GeeksforGeeks"
d[
'x'
]
=
20
return
d
d
=
fun()
print
(d)
- Output:
{'x': 20, 'str': 'GeeksforGeeks'}
Function returning another function
In Python, functions are objects so, we can return a function from another function. This is possible because functions are treated as first class objects in Python. To know more about first class objects click here.
In the below example, the create_adder function returns the adder function.
Python3
def
create_adder(x):
def
adder(y):
return
x
+
y
return
adder
add_15
=
create_adder(
15
)
print
(
"The result is"
, add_15(
10
))
def
outer(x):
return
x
*
10
def
my_func():
return
outer
res
=
my_func()
print
(
"\nThe result is:"
, res(
10
))
Output:
The result is 25 The result is: 100
My Personal Notes
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