Python OrderedDict access and existence check

Last update on April 23 2025 12:57:35 (UTC/GMT +8 hours)

3. Access and Check in OrderedDict

Write a Python program that accesses an item in the OrderedDict by its key. Check if a specified item exists in the OrderedDict as well.

Sample Solution:

Code:

from collections import OrderedDict

# Create an OrderedDict
ordered_dict = OrderedDict()
ordered_dict['Laptop'] = 40
ordered_dict['Desktop'] = 45
ordered_dict['Mobile'] = 35

# Access an item by its key
item = ordered_dict['Desktop']
print(f"Quantity of Desktops: {item}")

# Check if a specified item exists
item_to_check = 'Mobile'
if item_to_check in ordered_dict:
    print(f"{item_to_check} exists in the OrderedDict")
else:
    print(f"{item_to_check} does not exist in the OrderedDict")

# Check if a specified item exists
item_to_check = 'Charger'
if item_to_check in ordered_dict:
    print(f"{item_to_check} exists in the OrderedDict")
else:
    print(f"{item_to_check} does not exist in the OrderedDict")

Output:

Quantity of Desktops: 45
Mobile exists in the OrderedDict
Charger does not exist in the OrderedDict

In the exercise above, we use 'square brackets' to access an item in the OrderedDict using its key ('Desktop'). We also use the 'in' keyword to check if a specified item ('Mobile' / 'Charger') exists in the OrderedDict.

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python program to retrieve a value from an OrderedDict using a given key and print a default message if the key does not exist.
Write a Python script to check whether an OrderedDict contains a specified key and then print either "Found" or "Not Found".
Write a Python function that iterates through an OrderedDict and prints keys that meet a specific condition (e.g., keys starting with a vowel).
Write a Python program to access multiple items in an OrderedDict by a list of keys and output the corresponding values, returning None for missing keys.

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