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Oppiskele Lists (2/3) | Other data types
Learn Python from Scratch

Pyyhkäise näyttääksesi valikon

book
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)
copy
Tehtävä

Swipe to start coding

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

NameAge
John41
Michelle35

Ratkaisu

Switch to desktopVaihda työpöytään todellista harjoitusta vartenJatka siitä, missä olet käyttämällä jotakin alla olevista vaihtoehdoista
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book
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)
copy
Tehtävä

Swipe to start coding

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

NameAge
John41
Michelle35

Ratkaisu

Switch to desktopVaihda työpöytään todellista harjoitusta vartenJatka siitä, missä olet käyttämällä jotakin alla olevista vaihtoehdoista
Oliko kaikki selvää?

Miten voimme parantaa sitä?

Kiitos palautteestasi!

close

Awesome!

Completion rate improved to 2.33

Pyyhkäise näyttääksesi valikon

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