NamedTuple in python

Today I learnt about python container like dictionaries called "namedtuples" which is present in module called "collections"

Some of the operations performed on namedtuples are

1. Access by index
2. Access by keyname
3. Access by getattr

Conversion Operations supported

1. _make()  - returns namedtuple() from iterable passed as an argument.
2. _asdict() - returns OrderedDict() as constructed from the mapped values of namedtuple()
3. ** -  This operator is used to convert a dictionary into the namedtuple().

Extra Operations

1. _fields gives the information about all the key names declared. 

Example Code:

"""

Below examples discusses about namedtuple from collections module

"""

import collections


#Declaring a namedtuple

employee = collections.namedtuple("Employee", ["Name", "Age", "DOB"])



#Adding Values
emp = employee("Johnny Depp", "35", "02011983")


#initializing iterable
ex_list = ["Abraham", "24", "20091994"]


#initializing dict
ex_dict = {"Name" : "Moti", "Age" : 29, "DOB" : "16091987"}


#Below 3print statements print Same output

print(emp.Name) #Access by key
print(emp[0]) #Access by index
print(getattr(emp, "Name")) #Access via getattr



#using _make() to return namedtuple()
print ("The namedtuple instance using iterable is : ")
print(employee._make(ex_list))


#using _asdict() to return an OrderedDict()
print("The OrderedDict instance using namedtuple is :")
print(emp._asdict())



#using ** operator to return namedtuple from dictionary
print("The namedtuple instance from dict is :")
print(employee(**ex_dict))


#print fields of the named tuple
print(emp._fields)