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Learn Common List Methods in Python | Other Data Types in Python
Introduction to Python
course content

Course Content

Introduction to Python

Introduction to Python

1. First Acquaintance with Python
2. Variables and Types in Python
3. Conditional Statements in Python
4. Other Data Types in Python
5. Loops in Python
6. Functions in Python

book
Common List Methods in Python

There are many operations you can perform on a list. Here are some of the most common ones:

  • len(t): returns the number of items in list t;
  • list1 + list2: combines two lists (both must be lists);
  • t * n: creates n copies of list t;
  • t.append(x): adds x to the end of t (modifies the original list);
  • t.extend([x, y, ...]): appends multiple elements to t (also modifies the list);
  • t.copy(): creates a duplicate of t;
  • t.count(x): counts how many times x appears in t.

For example, let's expand our previous list by adding the capital city and total number of states.

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# Initial and new lists US_Info = ["USA", 9629091, 331002651] US_Info_new = ["Washington D.C.", 50] # Add new data using concatenation print(US_Info + US_Info_new) # Add new data using list method US_Info.extend(US_Info_new) print(US_Info)
copy

Note

The .extend() method requires an iterable as its argument. In this case it is a list. An iterable in Python is any object that can be traversed element by element.

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Section 4. Chapter 2
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