Remove empty strings using filter() Dry Run in PYTHON

Remove empty strings using filter() is an interactive PYTHON dry run visualizer from the Special programs section. Study the source code, then use the execution controls to follow each step, variable update, highlighted line, and console output.

This page provides a browser-based dry run with source-code highlighting, auto-scroll, voice narration controls, and execution output for learning the program step by step.

Remove empty strings using filter() Program Code

data = ["hello", "", "world", "   ", "python", "", "lambda", "  ", "filter"]

# Method 1: filter with None (removes falsy values)
non_empty1 = list(filter(None, data))

# Method 2: explicit lambda to strip whitespace
non_empty2 = list(filter(lambda s: s.strip() != "", data))

print(f"Original: {data}")
print(f"After filter(None): {non_empty1}")
print(f"After strip filter: {non_empty2}")

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