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Python Data Structures
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Python Data Structures

Python Data Structures

1. Mastering Python Lists
Creating Lists in Python: Declaring and Initializing ListsList Indexing in Python: Accessing Elements EfficientlyWorking with Nested Lists in PythonPython List Length: Measuring and Managing List SizeModifying Lists in Python: Updating and Changing ElementsUsing the append() Method: Adding Elements to ListsUsing the insert() Method: Placing Elements at Specific PositionsDeleting Elements in Python Lists: Removing Items SafelyUsing the remove() Method: Deleting Specific Elements from Lists
2. Mastering Python Dictionaries
Creating a Dictionary in Python: Storing Key-Value PairsAccessing Dictionary ValuesAccessing Dictionary KeysAdding Items to a Dictionary: Updating Key-Value PairsUsing the del Keyword: Removing Dictionary EntriesUsing the pop() Method: Deleting Elements with Return ValuesUsing the popitem() Method: Removing the Last Inserted ItemUsing the clear() Method: Emptying a Dictionary Completely
3. Mastering Python Tuples
Creating a Tuple in Python: Defining Immutable Data StructuresAccessing Elements in a Tuple: Indexing TechniqueConcatenating Tuples in Python: Merging Immutable SequencesDeleting Tuples in Python: Removing References to TuplesUpdating Tuples in PythonAdding Items to a Tuple: Alternative Approaches Using ListsCounting Elements in a Tuple: Using the count() MethodFinding Elements in a Tuple: Using the index() Method for Lookup
4. Mastering Python Sets
Creating a Set in Python: Defining Unordered CollectionsUsing the add() Method: Adding Single Elements to a SetUsing the update() Method: Merging Multiple Elements into a SetAccessing Elements in a Set: Iteration and Membership TestingUsing the remove() and discard() MethodsUsing the clear() Method: Removing All Elements from a Set

book
Using the append() Method: Adding Elements to Lists

The append() method in Python is used to add an element to the end of a list. It's a convenient way to expand a list dynamically without having to create a new one.

Imagine you have a list of cities you want to visit. You've already listed a few, but as your plans evolve, you want to add more cities without replacing the existing ones.

python

The list currently contains four cities. Now imagine you want to add another city, say "Sydney". Here's how you can do it:


              
123456

            
travel_wishlist = ['Paris', 'Tokyo', 'New York', 'Rome']

# Adding a new city to the travel wishlist
travel_wishlist.append("Sydney")

print(travel_wishlist) # Output: ['Paris', 'Tokyo', 'New York', 'Rome', 'Sydney']
copy

As you can see, "Sydney" has been added to the end of the list without affecting the existing items.

Note

  • The list grows by one element every time you use append();
  • You can append not only strings but also variables, numbers, or even other lists;
  • The same logic applies to integers, floats, or any object.

The append() method allows you to efficiently update your list without recreating it. Additionally, this method is especially practical in for loops, where you can dynamically build or grow a list by adding elements iteratively based on conditions or computations.

Taak

Swipe to start coding

You are given a list of cities, travel_wishlist.

  • Add 2 cities to the list: "Berlin", "New York".
  • Use the append method instead of recreating the list.

Oplossing

Switch to desktopSchakel over naar desktop voor praktijkervaringGa verder vanaf waar je bent met een van de onderstaande opties
Was alles duidelijk?

Hoe kunnen we het verbeteren?

Bedankt voor je feedback!

Sectie 1. Hoofdstuk 6
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book
Using the append() Method: Adding Elements to Lists

The append() method in Python is used to add an element to the end of a list. It's a convenient way to expand a list dynamically without having to create a new one.

Imagine you have a list of cities you want to visit. You've already listed a few, but as your plans evolve, you want to add more cities without replacing the existing ones.

python

The list currently contains four cities. Now imagine you want to add another city, say "Sydney". Here's how you can do it:


              
123456

            
travel_wishlist = ['Paris', 'Tokyo', 'New York', 'Rome']

# Adding a new city to the travel wishlist
travel_wishlist.append("Sydney")

print(travel_wishlist) # Output: ['Paris', 'Tokyo', 'New York', 'Rome', 'Sydney']
copy

As you can see, "Sydney" has been added to the end of the list without affecting the existing items.

Note

  • The list grows by one element every time you use append();
  • You can append not only strings but also variables, numbers, or even other lists;
  • The same logic applies to integers, floats, or any object.

The append() method allows you to efficiently update your list without recreating it. Additionally, this method is especially practical in for loops, where you can dynamically build or grow a list by adding elements iteratively based on conditions or computations.

Taak

Swipe to start coding

You are given a list of cities, travel_wishlist.

  • Add 2 cities to the list: "Berlin", "New York".
  • Use the append method instead of recreating the list.

Oplossing

Switch to desktopSchakel over naar desktop voor praktijkervaringGa verder vanaf waar je bent met een van de onderstaande opties
Was alles duidelijk?

Hoe kunnen we het verbeteren?

Bedankt voor je feedback!

Sectie 1. Hoofdstuk 6
Switch to desktopSchakel over naar desktop voor praktijkervaringGa verder vanaf waar je bent met een van de onderstaande opties
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