dict becomes list instance method in python

How does dict (dictionary) become list (list) in python?

Note: List cannot be converted to dictionary

1. The converted list is an unordered list

a = {'a' : 1, 'b': 2, 'c' : 3}

 

# In a dictionary key Convert to list 

key_value = list(a.keys())

print(' In a dictionary key Convert to list: ', key_value)

 

# In a dictionary value Convert to list 

value_list = list(a.values())

print(' In a dictionary value Convert to list: ', value_list)

Run results:

 In a dictionary key Convert to list: ['a','b','c']

 In a dictionary value Convert to list: [1,2,3]

2. The converted list is an ordered list

import collections

z = collections.OrderedDict()

z['b'] = 2

z['a'] = 1

z['c'] = 3

z['r'] = 5

z['j'] = 4

 

# In a dictionary key Convert to list 

key_value = list(z.keys())

print(' In a dictionary key Convert to list: ', key_value)

 

# In a dictionary value Convert to list 

value_list = list(z.values())

print(' In a dictionary value Convert to list: ', value_list)

Run results:

 In a dictionary key Convert to list: ['b','a','c','p','j']

 In a dictionary value Convert to list: [2,1,3,5,4]

Note: The version of Python used here is 3. x.

Python dict and list Conversion

There is an dict here

d1 = {
 'en':' English ',
 'cn':' Chinese ',
 'fr':' French ',
 'jp':' Japanese '
}

values and keys can be extracted using d1.keys () or d1.values (). You can also generate keys, and values with the following code:

list_values = [i for i in d1.values()]
list_keys= [ i for i in d1.keys()]

Thus, list_keys is: ['en', 'cn', 'fr', 'jp'] list_values is: ['English', 'Chinese', 'French', 'Japanese']

To combine these two list into one dict, you can combine the zip () function.

d2=dict(zip(list_keys,list_values))
print('d2',d2)

The result is:

d2 {'en': ' English ', 'cn': ' Chinese ', 'fr': ' French ', 'jp': ' Japanese '}

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