Python Filter List with filter(): Syntax and Examples
Filter a Python list with filter() and a lambda. See its syntax and return value, and filter strings, objects, None values and items by another list.
Python: Find Most Frequent Element in a List or Array
Find the most frequent element in a Python list with Counter.most_common(), statistics.mode() and multimode(), pandas and NumPy, including ties.
Python: Remove Duplicates from a List and Keep Order
Remove duplicates from a Python list while keeping order with dict.fromkeys(), a seen set, NumPy np.unique() and pandas, plus dedupe by key and timings.
Python: Keep Last N Items of a List, Array or String
Keep the last N items in Python with deque(maxlen=n) or slicing [-n:]. Covers lists, NumPy arrays, strings, the n=0 trap, file tails and moving averages.
Python List Comprehension: if-else, Nested and Examples
Learn Python list comprehension syntax with examples. Place if and if-else correctly, flatten lists, pair two lists with zip() and build dicts and sets.
