Implement Array Dictionaries In Python
An array specifies a variable that can be indexed as a list in rows and columns.
The first index is zero as is common is most programming languages. Python does not have an array data type. Instead the data type list, tuple, set or dictionary can be used.
A dictionary is a collection which is ordered and changeable not allowing duplicate members. Dictionaries are created using curly brackets and have key and value pairs.
Common Functions For Manipulating Dictionaries In Python
Common Dictionary Functions
| Name | Description | Example |
|---|---|---|
| len() | Determine how many items | len(pickup_truck) |
| get() | Returns the value of the specified key | pickup_truck.get(“model”) |
| update() | Add elements from one dictionary | pickup_truck.update({“color”: “Silver”}) |
| keys() | Returns a list containing the dictionary’s keys | the_keys = pickup_truck.keys()) |
| values() | Returns a list of all the values in the dictionary | the_values = pickup_truck.values() |
| clear() | Remove all values | pickup_truck.clear() |
| pop() | Removes the element with the specified key | pickup_truck.pop(“model”) |
| Name | Description | Example |
Python Dictionary Snippet
# OjamboShop.com Learning Python Array Dictionary Tutorial #
pickup_truck = {"brand": "Ford", "model": "F-Series", "year": 1984}
print(pickup_truck)
print(len(pickup_truck)) # Number Of Items In Dictionary
the_model = pickup_truck["model"] # Access Item By Key Name
print(the_model)
the_model = pickup_truck.get("model") # Access Item By Key Name And Get Value
print(the_model)
the_keys = pickup_truck.keys() # Get Keys
print(the_keys)
the_values = pickup_truck.values() # Get Values
print(the_values)
the_items = pickup_truck.items() # Get Items As Tuples In A List
print(the_items)
pickup_truck["year"] = 2024 # Change Item Value By Key Name
print(pickup_truck)
pickup_truck.update({"year": 2000}) # Modify Item By Update
print(pickup_truck)
pickup_truck["color"] = "Red" # Add Item Value By Key Name
print(pickup_truck)
pickup_truck.update({"color": "Silver"}) # Add Or Modify Item By Update
print(pickup_truck)
pickup_truck.pop("model") # Pop Item By Key Name
print(pickup_truck)
pickup_truck.pop("color") # Remove Item by Key Name
print(pickup_truck)
pickup_truck.clear() # Remove All Items
print(pickup_truck)
copied_dict = pickup_truck.copy() # Make A Copy
print(copied_dict)
copied_dict2 = dict(pickup_truck)
print(copied_dict2)
Usage
You can use any IDE or text editor and the command line to compile and execute Python code. For this tutorial, the OjamboShop.com Learning Python Course Web IDE can used to input and compile Python code for dictionaries.
Open Source
Python is licensed under the Python Software Foundation License. This allows commercial use, modification, distribution, and allows making derivatives proprietary.
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Conclusion:
Python makes it easy to use dictionaries. Use dictionaries when you need an ordered, changeable array without duplicate members such as memberships requiring key and value pairs.
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