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.
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)
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)
Tarea
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 |
Solución
# old list
people = ["Alex", 23, "Noah", 34, "Peter", 29]
# try to use concatenation
new_people = ["John", 41, "Michelle", 35]
print(people + new_people)
# try to use list methods
people.extend(("John", 41, "Michelle", 35))
print(people)
¿Todo estuvo claro?
¡Gracias por tus comentarios!
Sección 5. Capítulo 2
# old list
people = ["Alex", 23, "Noah", 34, "Peter", 29]
# try to use concatenation
new_people = ["John", 41, "Michelle", 35]
print(_ _ _)
# try to use list methods
_ _ _._ _ _(("John", 41, _ _ _))
print(people)
