Practical Application of the len() Function in Python (in 90 seconds)

Описание: Understanding the len() function is essential for Python programming. In this tutorial, we explore its practical applications, from measuring string lengths to counting elements in lists, tuples, and ranges. We also cover Boolean comparisons and list comprehensions to filter data efficiently. Whether you're a beginner or looking to refine your Python skills, this video will help you leverage len() like a pro.

What You’ll Learn:
How the len() function works in Python
Using len() with strings, tuples, and ranges
Comparing object lengths using Boolean expressions
Filtering lists based on element length with list comprehensions

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help(len)

Example Data
name = 'JR'
scores = (89.76, 91.34, 93.65, 89.11)
r = range(1, 20, 2) # Generates a range from 1 to 20, counting by 2
l = ['Bill', '1976', 'Phil', 'Hello', '57']

Calculate Length of Variables
print(len(name), len(scores), len(r))

Compare Lengths Using Boolean Expressions
print(len(name) == len(scores))

Filter List Elements by Length Using List Comprehension
print([word for word in l if len(word) == 4])

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Why This is Important?
len() is one of the most commonly used Python functions
Helps in data analysis, filtering, and object manipulation
Useful for working with lists, tuples, dictionaries, and strings