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function_example.py
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def
my_function
()
->
None
:
"""
No argument, No Returns function.
>>> my_function()
hi
"""
print
(
"hi"
)
def
add
(
a
:
int
,
b
:
int
)
->
int
:
"""
Add of a and b.
>>> add(3, 3)
6
>>> add(3, -3)
0
>>> add(99, 1)
100
"""
return
a
+
b
def
add_more
(
*
args
):
"""
Arbitrary Arguments
>>> add_more(1, 2, 3)
6
"""
return
sum
(
args
)
def
calculate
(
a
:
int
,
operator
:
str
,
b
:
int
)
->
int
:
"""
Simple calculator.
>>> calculate(a = 3, operator = "+", b = 4)
7
>>> calculate(a = 3, operator = "-", b = 4)
-1
>>> calculate(a = 3, operator = "*", b = 4)
12
>>> calculate(a = 3, operator = "/", b = 4)
0
>>> calculate(a = 3, operator = "!", b = 4)
Traceback (most recent call last):
...
ValueError: Invalid operator
"""
if
operator
==
"+"
:
return
a
+
b
elif
operator
==
"-"
:
return
a
-
b
elif
operator
==
"*"
:
return
a
*
b
elif
operator
==
"/"
:
return
a
//
b
else
:
raise
ValueError
(
"Invalid operator"
)
def
intro
(
**
kwargs
):
"""
>>> intro(name="Python", age = 29)
key=name, value=Python
key=age, value=29
"""
for
(
key
,
value
,
)
in
kwargs
.
items
():
print
(
f"key=
{
key
}
, value=
{
value
}
"
)
def
print_number
(
number
:
int
=
5
)
->
int
:
"""
Default parameter.
>>> print_number(100)
100
>>> print_number()
5
"""
print
(
number
)
def
get_max
(
array
):
"""
Pass list as parameter.
>>> get_max([1, 3, 5, 7, 9])
9
"""
max_value
=
array
[
0
]
for
item
in
array
:
if
item
>
max_value
:
max_value
=
item
return
max_value
def
pass_function
():
"""
>>> pass_function()
"""
pass
# do anything.
def
factorial
(
n
:
int
)
->
int
:
"""
Recursion function.
>>> factorial(0)
1
>>> factorial(1)
1
>>> factorial(5)
120
>>> factorial(6)
720
"""
return
1
if
n
==
0
or
n
==
1
else
n
*
factorial
(
n
-
1
)
if
__name__
==
"__main__"
:
from
doctest
import
testmod
testmod
()
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