How can I get a flat result from a list comprehension instead of a nested list?

by

You can have nested iterations in a single list comprehension:

[filename for path in dirs for filename in os.listdir(path)]

which is equivalent (at least functionally) to:

filenames = []
for path in dirs:
    for filename in os.listdir(path):
        filenames.append(filename)

More Related Contents:

  1. how to create a list of lists using list comprehension [closed]
  2. List comprehension vs map
  3. List comprehension rebinds names even after scope of comprehension. Is this right?
  4. Creating a dictionary from a csv file?
  5. Python: Why is functools.partial necessary?
  6. Double Iteration in List Comprehension
  7. Can you explain closures (as they relate to Python)?
  8. How does functools partial do what it does?
  9. List vs generator comprehension speed with join function [duplicate]
  10. Set operations (union, intersection) on Swift array?
  11. How can I do assignments in a list comprehension?
  12. What is a Y-combinator? [closed]
  13. How can I use a conditional expression (expression with if and else) in a list comprehension? [duplicate]
  14. How to return a subset of a list that matches a condition [duplicate]
  15. Get number of items from list (or other iterable) with certain condition
  16. “Closures are poor man’s objects and vice versa” – What does this mean?
  17. What is the exact definition of a closure?
  18. The truth value of an array with more than one element is ambigous when trying to index an array
  19. Comprehension on a nested iterables?
  20. remove None value from a list without removing the 0 value
  21. What is “point free” style (in Functional Programming)?
  22. How to remove duplicate items from a list using list comprehension? [duplicate]
  23. sum each value in a list of tuples
  24. Any Functional Programming method of traversing a nested dictionary?
  25. Pass a typed function as a parameter in Dart
  26. Specification for a Functional Reactive Programming language
  27. How to limit the size of a comprehension?
  28. So: what’s the point?
  29. Removing syntactic sugar: List comprehension in Haskell
  30. Why is Python’s list comprehension loop order backwards? [duplicate]

Leave a Comment