Python how to split dictionary keys and values ​​into separate lists? (code example)

How to split a given dictionary into a list of keys and values ​​in Python? The following article will introduce you to several implementation methods. I hope it will be helpful to you. [Video tutorial recommendation: Python tutorial]

Method 1: Use built-in functions: keys() and values()

keys() function: can return all the keys in a dictionary in the form of a list.

values() function: can return all the values ​​in a dictionary in the form of a list.

The following is a code example to see how to use the keys() and values() functions to split the keys and values ​​of the dictionary.

#初始化字典
ini_dict = {'a' : 'akshat', 'b' : 'bhuvan', 'c': 'chandan'}
  
# 输出ini_dict字典
print("ini_dict=", str(ini_dict))
  
# 将字典拆分为键和值的列表
keys = ini_dict.keys()
values = ini_dict.values()
  
# 分别输出键和值的列表
print ("keys : ", str(keys))
print ("values : ", str(values))

Output:

##Method 2: Use zip() function

zip() function is used to take an iterable object as a parameter, pack the corresponding elements in the object into tuples, and then return a list composed of these tuples.

If the number of elements in each iterator is inconsistent, the length of the returned list is the same as the shortest object. Using the * operator, the tuple can be decompressed into a list.

The following is a code example to see how to use the zip() function to split the keys and values ​​of a dictionary.

#初始化字典
ini_dict = {'student_id' : '01', 'name' : 'May', 'age': '22'}
# 输出ini_dict字典
print("ini_dict=", str(ini_dict))

# 将字典拆分为键和值的列表
keys, values = zip(*ini_dict.items())

# 分别输出键和值的列表
print ("keys : ", str(keys))
print ("values : ", str(values))

Output:

Note: In order to reduce memory in Python 3.x, zip() returns Is an object; if you need to display a list, you need to manually use list() conversion.

Method 3: Use the items() function

items() function will return a traversable (key, value) tuple in a list array.

The following is a code example to see how to use the items() function to split the keys and values ​​of the dictionary.

#初始化字典
ini_dict = {'student_id' : '05', 'name' : '欧阳克', 'age': '22'}

# 输出ini_dict字典
print("ini_dict=", str(ini_dict))

# 将字典拆分为键和值的列表
keys = []
values = []
items = ini_dict.items()
for item in items:
    keys.append(item[0]), values.append(item[1])

# 分别输出键和值的列表
print ("keys : ", str(keys))
print ("values : ", str(values))

Output:

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