Lesson 11 Python Lists

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Transcript

Pattern list, and list is a collection. A collection allows us to put several values into a single variable. A collection is convenient, because it allows us to carry full of values in a single package. In this example, friends and actions are list. What is not a collection, most of our variables contain a value. When we add another value to our variable, the old value is replaced.

So a variable is not a collection. List constants. List constants are enclosed by square brackets, and the elements in the list are separated by commas. A list of items can be any Python object, even another list and list maybe empty. Each of the situation has been exemplified on the right side operations on this you can find here each operation exemplified first, you can create an empty list then create a list With four elements, then a list with the previous list as an element of the new list. This image shows you how to access elements by index by interval indexes, How to Add list, concatenate, and how to repeat the same list.

Then you see how to add elements to a list. At the end of it. sorted list, find an elements index, reverse the list, change a list element by index value, delete an element by index, delete by interval, and how to loop through the list. Here's a simple use of a list. lists and loops are very good friends. Each element in the list gets printed with this for loop search analyst.

Just like strings, we can reach each element of a list with an index specified in brackets. Lists are mutable. Strings are immutable. We cannot change the contents of a string. We have to create a new string so that we can modify it As you can see, you get an error on the right side of the image. When you try to reassign the value of the string sliders, the lists are mutable, we can change an element of a list.

Using the index operator, we can change the values of a list, as exemplified on the right side of the image. What is the length of a list, the Len function takes as a parameter a list, and indicates the number of elements present in the list. In fact, Len can tell us the number of elements present in any set or sequence such as strength using range function. The range function gives us a list of numbers that range from zero to one less than the parameter. We can create a loop index using for an entire iterator with an integer argument and range returns the list of n first integers with two integer arguments and n range m comma n returns the list of consecutive integers between m included and excluded with integer arguments, MK n range m comma n k returns the list of integers of the form m plus k times P, with P natural integers between m included and an excluded.

A non integer argument causes a type error error out and in list. Python provides two operators that allow you to check if an item is in a list. These are logical operators. They give us a true or false response. They do not modify the list internal functions in this. There are a number of functions in Python that allow you to define the list as parameters.

Do you remember the loops we built it's much simpler than that. Simply type the correct function for minimum, maximum and others to get the desired result. Here are two ways of finding the average of numbers. Both accept user input, the first adds the value to a variable, then it divides the result to the count variable number of inputs. The second as each input to a list, then performs the song and divides the sum to the length of the list. Double split.

Sometimes, we split a line one way, then we select one part that we will split further. Here we split an email into two results. The first part of the email address, then the part after the Add sign. In this picture, you can see examples of list of changes performed on the list and searches made. From the end of the list. You can see splitting being performed and other changes being done to list a list of lists.

One list contains objects of type list, change bases on index list methods. Here are exemplified the list method count that counts the element of the list, insert that insert an element as a specific position. append that append an element at the end of the list index that shows the index of an element. Remove that delete an element. Reverse that reverts to list begins with the last element and enter the first element sort. That changes the order of the elements.

To have the list in alphabetic order. Pop that deletes the last element of the list slice notion, it is possible to accept the I element of a list or a string with T of I. The slice consists of accessing a portion of a list or a string notation, T of W until end takes the sub list where the substring between the indexes begin and end one. We can use negative indices to index negative i is the same as going negative capital I string f equal to bondra, print f of negative two will give you you print f of one, two, negative two will give you oh and JO default parameters of slice. In a slice, the beginning is by default zero to t of the four elements is the same st of zero to four. In a slice, the flag is by default length of t, or T of the first four elements is the same as T of four after the length of t, t from zero to seven.

These are the first seven elements, t from to to end. These are the elements from the third, the first zero, t from beginning until negative two. These are all elements except the last two, T of negative five to end. These are all the last five elements

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