如果L1和L2是包含键和对应值的列表对象,则可以使用以下列表推导式语法构建字典对象. >>>L1=['a','b','c','d']>>>L2=[1,2,3,4]>>>d={L1[k]:L2[k]forkinrange(len(L1))}>>>d{'a':1,'b':2,'c':3,'d':4} Python 更多Python相关文章,请阅读:Python 教程 ...
The example creates a dictionary of cities with literal notation. Python dictionary fromkeysThe fromkeys is a class method to create a new dictionary with keys from an iterable and values set to a value. fromkeys.py data = ['coins', 'pens', 'books', 'cups']; items = dict.fromkeys(data...
Another method to convert two lists into a dictionary is by using dictionary comprehension. Adictionary comprehensionis a concise and more pythonic way to create a new dictionary from an iterable by specifying how the keys and values should be mapped to each other. See the following example. # ...
index = [1, 2, 3] languages = ['python', 'c', 'c++'] dictionary = dict(zip(index, languages)) print(dictionary) Output {1: 'python', 2: 'c', 3: 'c++'} We have two lists: index and languages. They are first zipped and then converted into a dictionary. The zip() function...
Python Dictionary: Create a new dictionary, Get value by key, Add key/value to a dictionary, Iterate, Remove a key from a dictionary, Sort a dictionary by key, maximum and minimum value, Concatenate two dictionaries, dictionary length
Convert list into dictionary python, implying thedict.fromkeys()method, hence creating a dictionary from a list. A Pythonzip()function can be used to create a dictionary from two lists. Based on a list of values, you can create a new dictionary or convert list to dictionary python by apply...
Write a Python program to combine two or more dictionaries, creating a list of values for each key. Create a new collections.defaultdict with list as the default value for each key and loop over dicts. Use dict.append() to map the values of the dictionary to keys. ...
Python Dictionary Notes: Dictionary keys must be immutable, such as tuples, strings, integers, etc. We cannot use mutable (changeable) objects such as lists as keys. We can also create a dictionary using a Python built-in functiondict(). To learn more, visitPython dict(). ...
Then I’ll create complex dictionaries containing lists and append the deep copies to the list using the extend() method.from copy import deepcopy # Initialize an empty list dict1_new = {"key1": "value1", "key2": ["item1", "item2"]} # Create a dictionary containing lists dict2_...
In collections, you’ll find the ChainMap class, which allows you to create a dictionary-like object by combining multiple existing dictionaries. With ChainMap, you can iterate through several dictionaries as if they were a single one. In itertools, you’ll find a function called chain() that...