The most basic data structure binary option dictionary Python is the sequence. Each element of a sequence is assigned a number – its position or index. The first index is zero, the second index is one, and so forth.
Python has six built-in types of sequences, but the most common ones are lists and tuples, which we would see in this tutorial. There are certain things you can do with all sequence types. These operations include indexing, slicing, adding, multiplying, and checking for membership. In addition, Python has built-in functions for finding the length of a sequence and for finding its largest and smallest elements.
Important thing about a list is that items in a list need not be of the same type. Creating a list is as simple as putting different comma-separated values between square brackets. Similar to string indices, list indices start at 0, and lists can be sliced, concatenated and so on. Accessing Values in Lists To access values in lists, use the square brackets for slicing along with the index or indices to obtain value available at that index. In fact, lists respond to all of the general sequence operations we used on strings in the prior chapter. Indexing, Slicing, and Matrixes Because lists are sequences, indexing and slicing work the same way for lists as they do for strings. Gives the total length of the list.