collection

Map

• It is a collection which can contains multiple values/objects mapped to a key.
• It returns a Map iterator object of the results.
• Iterator object is a special type of object to which we can apply a for loop to retrieve values from it. (Just like range function returns an iterator object.)
• We can pass this iterator object as argument to functions like list() (to create a list), set() (to create a set) and so on.

map(function, iterable, ...)

• Function: - map() passes each item of the iterable to this transform function.
• Iterable: - iterable which is to be mapped.
• Note: You can pass more than one iterable to the map() function.

names=['amit','raj','mohan']
mobj = map(len,names)
print(mobj)
for item in mobj:
    print(item)
lst=list(mobj)
print(lst)

<map object at 0x0000018359114700>
4
3
5
[4,3,5]

• Map function returns a Map iterator object of the results.
• Iterator object is a special type of object to which we can apply a for loop to retrieve values from it.
• We can pass this iterator object as argument to functions like list() (to create a list), set() (to create a set) and so on.

def myfun(val):
    return val.upper()
names=['amit','raj','mohan']
mobj=map(myfun,names)
print(mobj)
for item in mobj:
    print(item)
lst=list(mobj)
print(lst)

<map object at 0x0000018359114700>
AMIT
RAJ
MOHAN
['AMIT','RAJ','MOHAN']

def myfun(val1,val2):
    return val1+' '+val2
fnames=['amit','raj', 'mohan','radha']
lnames=['jain','rathi','joshi']
mobj = map(myfun,fnames,lnames)
print(mobj)
lst=list(mobj)
print(lst)

<map object at 0x0000018359114700>
['amit jain','raj rathi','mohan joshi']

lst=input('Enter Numbers :').split()
mobj=map(int,lst)
nlst=list(mobj)
s=sum(nlst)
print("Sum is ",s)

  Enter Numbers: 5 11 2 15 4
Sum is 43