Can dict have list in Python?

It definitely can have a list and any object as value but the dictionary cannot have a list as key because the list is mutable data structure and keys cannot be mutable else of what use are they.

What is dict list in Python?

Both of these are tools used in the Python language, but there is a crucial difference between List and Dictionary in Python. A list refers to a collection of various index value pairs like that in the case of an array in C++. A dictionary refers to a hashed structure of various pairs of keys and values.

Is dict or list faster Python?

A dictionary is 6.6 times faster than a list when we lookup in 100 items.

Should I use dict () or {}?

With CPython 2.7, using dict() to create dictionaries takes up to 6 times longer and involves more memory allocation operations than the literal syntax. Use {} to create dictionaries, especially if you are pre-populating them, unless the literal syntax does not work for your case.

Can we store list in dictionary?

Note that the restriction with keys in Python dictionary is only immutable data types can be used as keys, which means we cannot use a dictionary of list as a key . But the same can be done very wisely with values in dictionary. Let’s see all the different ways we can create a dictionary of Lists.

Can a dict have a list as value?

For example, you can use an integer, float, string, or Boolean as a dictionary key. However, neither a list nor another dictionary can serve as a dictionary key, because lists and dictionaries are mutable. Values, on the other hand, can be any type and can be used more than once.

What is the difference between dict and list?

List is a collection of index values pairs as that of array in c++. Dictionary is a hashed structure of key and value pairs. The indices of list are integers starting from 0. The keys of dictionary can be of any data type.

Why dictionary is used in Python?

Dictionaries are used to store data values in key:value pairs. A dictionary is a collection which is ordered*, changeable and do not allow duplicates. As of Python version 3.7, dictionaries are ordered. In Python 3.6 and earlier, dictionaries are unordered.

Why are dictionaries better than lists Python?

Therefore, the dictionary is faster than a list in Python. It is more efficient to use dictionaries for the lookup of elements as it is faster than a list and takes less time to traverse. Moreover, lists keep the order of the elements while dictionary does not.

Why are dictionaries faster than lists?

The reason is because a dictionary is a lookup, while a list is an iteration. Dictionary uses a hash lookup, while your list requires walking through the list until it finds the result from beginning to the result each time.

Is list () Same as []?

list is a global name that may be overridden during runtime. list() calls that name. [] is always a list literal.