Lists (2/3)

There are several operations available for manipulating lists, same as for string, such as:

len() - length of list (i.e. number of elements);
list1 + list2 - concatenation (both must be lists);
list1 * n - n copies of list1;
list.append(x) - add x (one element!) to the end of list (x can not be list) - this one rewrites your list;
list.extend((x, y, ...)) - add x,y, ... to the end of list - also rewrites your list;
list.copy() - creates a copy of your list;
list.count(x) - counts number of x in list.

For example, we can modify a bit our list with several more countries.


              12345678910
            
countries = ["USA", 9629091, "Canada", 9984670, "Germany", 357114]
# list with new countries
countries_new = ["Brazil", 8515767, "India", 3166391]

# add new data (list) to our list using concatenation
print(countries + countries_new)

# using list method
countries.extend(("Brazil", 8515767, "India", 3166391))
print(countries)

Task

Swipe to start coding

Modify your last list with new data. Experiment with both methods and print the result.

Name	Age
John	41
Michelle	35

Solution

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Section 5. Chapter 2

Lists (2/3)

There are several operations available for manipulating lists, same as for string, such as:

len() - length of list (i.e. number of elements);
list1 + list2 - concatenation (both must be lists);
list1 * n - n copies of list1;
list.append(x) - add x (one element!) to the end of list (x can not be list) - this one rewrites your list;
list.extend((x, y, ...)) - add x,y, ... to the end of list - also rewrites your list;
list.copy() - creates a copy of your list;
list.count(x) - counts number of x in list.

For example, we can modify a bit our list with several more countries.


              12345678910
            
countries = ["USA", 9629091, "Canada", 9984670, "Germany", 357114]
# list with new countries
countries_new = ["Brazil", 8515767, "India", 3166391]

# add new data (list) to our list using concatenation
print(countries + countries_new)

# using list method
countries.extend(("Brazil", 8515767, "India", 3166391))
print(countries)

Task

Swipe to start coding

Modify your last list with new data. Experiment with both methods and print the result.

Name	Age
John	41
Michelle	35

Solution

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Section 5. Chapter 2

Switch to desktop for real-world practiceContinue from where you are using one of the options below