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Learn Common Dictionary 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

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Common Dictionary Methods in Python

Dictionaries have unique characteristics that set them apart from lists and tuples. They also come with their own set of methods.

  • len(d) - returns the number of key:value pairs in the dictionary d;
  • d.copy() - creates a copy of the dictionary d;
  • d.items() - provides all the key, value pairs from the dictionary d;
  • d.keys() - lists all the keys in the dictionary d;
  • d.values() - provides all the values from the dictionary d.

Unlike lists, dictionaries don't use methods like .append() or .extend(), nor do they support concatenation like strings. Instead, since dictionaries store data as key-value pairs, you add new entries by simply assigning a value to a key.

  • d[k] = e – assigns the value e to the key k. If k already exists in the dictionary, its value is updated otherwise, a new key-value pair is added.
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# Initial dictionary countries_dict = {'USA': (9629091, 331002651), 'Canada': (9984670, 37742154), 'Germany': (357114, 83783942)} # Update dictionary with two countries countries_dict["Brazil"] = (8515767, 212559417) countries_dict["India"] = (3166391, 1380004385) # Printing dictionary print(countries_dict)
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Section 4. Chapter 13
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