Map function on python tutorial

1. MAP()
PYTHONCreated By:
Muhammad Fathan M. (1906293190)
Marcia Nadin (1906293146)
Nabila Khansa (1906293221)
Dwi Ayu Sekarini P. (1906399190)
Under Guidance Of
Fariz Darari, S.Kom, M.Sc., Ph.D.

2. MAP()
FUNCTION
The map function takes two
arguments:
Function
Iterable object
It applies the function to all
items of the iterable object,
returning a map object.
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3. OUTPUT :
<MAP OBJECT>
The map object is an iterator,
with elements able to be
iterated over.
It can also be converted into a
sequence object such as :
List
Tuple
Etc.
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4. GIG 4
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Convert all string numbers
to integer inside a list
[‘1’,’2’,’3’,’4’,’5’]
[1,2,3,4,5]

5. DIRECT METHOD 5
>>>
>>>
>>>
>>>
>>>
str_num = [‘1’,’2’,’3’,’4’,’5’]
int_numbers = [] #create an empty list
for i in str_num: #using for loop
a = int(i) #use the int() function
int_num.append(a) #appends result to a new list
int_num
[1,2,3,4,5]
OUTPUT

6. MAP() FUNCTION
Data = a1, a2, a3, a4, …
Function: f(x)
map(f, Data):
return an iterator over f(a1),
f(a2), f(a3), f(a4), ...
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7. GIG 2 7
given a list of three
dimensional points in the
form of tuples, create a
new list consisting of the
distances of each point
from the origin

8. MAP() FUNCTION
from math import sqrt
points = [(2,1,3),(5,7,-3),(2,4,0),(9,6,8)]
def distance(point):
x,y,z = point
return sqrt(x**2 + y**2 + z**2)
distances = list(map(distance,points))
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9. UTILIZING MAP FUNCTION 9
>>>
>>>
>>>
string_numbers = [‘1’,’2’,’3’,’4’,’5’]
int_numbers = map(int, string_numbers)
int_numbers
<map object at 0x000001C05465E370>
*Map function does not return a list

10. Converting the Result 10
Convert using the list function
string_numbers = [‘1’,’2’,’3’,’4’,’5’]
int_numbers = list(map(int, string_numbers))
int_numbers
>>>
>>>
>>>
OUTPUT
[1,2,3,4,5]>>>

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