Answers for "list to dict python"

python dictionary to list

>> d = {'a': 'Arthur', 'b': 'Belling'}

>> d.items()
[('a', 'Arthur'), ('b', 'Belling')]

>> d.keys()
['a', 'b']

>> d.values()
['Arthur', 'Belling']

list to string python

list1 = ['1', '2', '3']
str1 = ''.join(list1)

list to dict python

my_list = ['Nagendra','Babu','Nitesh','Sathya']
my_dict = dict() 
for index,value in enumerate(my_list):
  my_dict[index] = value
print(my_dict)
#OUTPUT
{0: 'Nagendra', 1: 'Babu', 2: 'Nitesh', 3: 'Sathya'}

convert list to dictionary using python

# Python3 program to Convert a
# list to dictionary
 
def Convert(lst):
    res_dct = {lst[i]: lst[i + 1] for i in range(0, len(lst), 2)}
    return res_dct
         
# Driver code
lst = ['a', 1, 'b', 2, 'c', 3]
print(Convert(lst))

dictionary to list python

# This is our example dictionary
petAges = {"Cat": 4, "Dog": 2, "Fish": 1, "Parrot": 5}
# This will be our list, epmty for now
petAgesList = []
# Search through the dictionary and find all the keys and values
for key, value in petAges.items(): 
  petAgesList.append([key, value]) # Add the key and value to the list
print(petAgesList) # Print the now-filled list
# Output: [['Cat', 4], ['Dog', 2], ['Fish', 1], ['Parrot', 5]]

python convert a list to dict

#python convert a dict to list or a list to dict or a slice a dict or sort a dict by key or value without import
#convert dict to list or list to dict or slice a dict
#1. convert dict to list
temp = [] # not required as [] is mentioned below
s = {'b': 3, 'a': 2, 'c': 2, 'd': 1, 'e': 1}#our dict remember
temp = [[k,v]for k,v in s.items()]# temp is now list
print(temp)#[['b', 3], ['a', 2], ['c', 2], ['d', 1], ['e', 1]]

#2. list to dict || pass a list like below
a_dict ={}# not required since we have {} in below
a_dict = {  v[0]:v[1] for k,v in enumerate(temp)}
# OR || a_dict = {  v[0]:v[1] for k,v in enumerate([k,v]for k,v in s.items())}
print(a_dict)#{'b': 3, 'a': 2, 'c': 2, 'd': 1, 'e': 1}

#3. Slice a dict is as simple slice as slicing a list
#see below at temp[0:3] to slice dict to first 4 elements (0 to 3)
a_dict = {  v[0]:v[1] for k,v in enumerate(temp[0:3])}
print(a_dict)#{'b': 3, 'a': 2, 'c': 2}
# OR Also like doing this ([[k,v]for k,v in s.items()][0:3])
#a_dict = { v[0]:v[1] for k,v in enumerate([[k,v]for k,v in s.items()][0:3])}
print(a_dict)#{'b': 3, 'a': 2, 'c': 2}

#Sort a dict #Reverse True for desc and False for asc
#4. Sort a dict by key || s = {'b': 3, 'a': 2, 'c': 2, 'd': 1, 'e': 1}
a_dict = dict(sorted(s.items(),key=lambda x:x[0],reverse = False))
print(a_dict )# {'a': 2, 'b': 3, 'c': 2, 'd': 1, 'e': 1}
#Sort a dict by value || put 1 in x:x[1]
a_dict = dict(sorted(s.items(),key=lambda x:x[1],reverse = False))
#{'d': 1, 'e': 1, 'a': 2, 'c': 2, 'b': 3}

#5. Sort dict with import operator
import operator as op#change itemgetter to 0|1 for key|value
a_dict = dict(sorted(s.items(),key=op.itemgetter(0), reverse = False))
print(a_dict)#{'a': 2, 'b': 3, 'c': 2, 'd': 1, 'e': 1}
#refer to #python convert a dict to list or a list to dict or a slice a dict or sort a dict by key or value without import
#convert dict to list or list to dict or slice a dict
#1. convert dict to list
temp = [] # not required as [] is mentioned below
s = {'b': 3, 'a': 2, 'c': 2, 'd': 1, 'e': 1}#our dict remember
temp = [[k,v]for k,v in s.items()]# temp is now list
print(temp)#[['b', 3], ['a', 2], ['c', 2], ['d', 1], ['e', 1]]

#2. list to dict || pass a list like below
a_dict ={}# not required since we have {} in below
a_dict = {  v[0]:v[1] for k,v in enumerate(temp)}
# OR || a_dict = {  v[0]:v[1] for k,v in enumerate([k,v]for k,v in s.items())}
print(a_dict)#{'b': 3, 'a': 2, 'c': 2, 'd': 1, 'e': 1}

#3. Slice a dict is as simple slice as slicing a list
#see below at temp[0:3] to slice dict to first 4 elements (0 to 3)
a_dict = {  v[0]:v[1] for k,v in enumerate(temp[0:3])}
print(a_dict)#{'b': 3, 'a': 2, 'c': 2}
# OR Also like doing this ([[k,v]for k,v in s.items()][0:3])
#a_dict = { v[0]:v[1] for k,v in enumerate([[k,v]for k,v in s.items()][0:3])}
print(a_dict)#{'b': 3, 'a': 2, 'c': 2}

#Sort a dict #Reverse True for desc and False for asc
#4. Sort a dict by key || s = {'b': 3, 'a': 2, 'c': 2, 'd': 1, 'e': 1}
a_dict = dict(sorted(s.items(),key=lambda x:x[0],reverse = False))
print(a_dict )# {'a': 2, 'b': 3, 'c': 2, 'd': 1, 'e': 1}
#Sort a dict by value || put 1 in x:x[1]
a_dict = dict(sorted(s.items(),key=lambda x:x[1],reverse = False))
#{'d': 1, 'e': 1, 'a': 2, 'c': 2, 'b': 3}

#5. Sort dict with import operator
import operator as op#change itemgetter to 0|1 for key|value
a_dict = dict(sorted(s.items(),key=op.itemgetter(0), reverse = False))
print(a_dict)#{'a': 2, 'b': 3, 'c': 2, 'd': 1, 'e': 1}
#refer to https://ideone.com/uufYuP
#dn't forget to upvote