Map in Python :
For more information, refer to: Python map() function
for loop in Python :
For more information, refer to: Python For Loops
Example:
Python
# function to square a given number
def squareNum (a) :
return a * a
listt = [0, -1, 3, 4.5, 99, .08]
# using 'map' to call the function
# 'squareNum' for all the elements
# of 'listt'
x = map(squareNum, listt)
# map function returns a map
# object at this particular
# location
print(x)
# convert map to list
print(list(x))
# alternate way to square all
# elements of 'listt' using
# 'for loop'
for i in listt :
square = i * i
print(square)
Output:
<map object at 0x7fe413cf9b00>
[0, 1, 9, 20.25, 9801, 0.0064]
0
1
9
20.25
9801
0.0064
Map vs for loop
Comparing performance , map() wins! map() works way faster than for loop.
Using map():
Using for loop:
for loop can be with no content, no such concept exist in map() function.
Example:
Python
</p><pre><code class="language-python3 1==">
# we use the keyword 'pass'
# to simply get a for loop
# with no content
for i in range (10) :
pass
</code></pre><p></p><p dir="ltr"><span>There can be an </span><code><span>else</span></code><span> condition in </span><code><span>for</span></code><span> loop which only runs when no </span><code><span>break</span></code><span> statement is used. There is nothing like this in </span><code><span>map</span></code><span>.</span></p><p dir="ltr"><b><strong>Example : </strong></b><gfg-tabs data-run-ide="true" data-mode="light"><gfg-tab slot="tab">Python
# for loop with else condition
for i in range(10) :
print(i)
else :
print("Finished !")
Output : 0
1
2
3
4
5
6
7
8
9
Finished !
for loop can exit before too. We can do that using break statement. Exiting before expected is not possible in map.
map generates a map object, for loop does not return anything.
syntax of map and for loop are completely different.
for loop is for executing the same block of code for a fixed number of times, the map also does that but in a single line of code.
Let us see the differences in a tabular form -:
| | Map() | forloop |
| 1. | The map() function executes a specified function for each item in an iterable. | The for loop is used for iterating over a sequence. |
| 2. | Its syntax is -: map(function, iterables) | It is used by using for keyword. |
| 3. | In this, the item is sent to the function as a parameter. | It is used to execute a set of statements, once for each item in a list, tuple, set etc. |
| 4. | It takes two parameters function and iterables. | Its syntax is -: for var in iterable :
statements |
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