You can filter lists based on specified criteria using the filter() function in Python. You can also Filter the list elements using for loop, list comprehension, regex, and lambda functions.
Python filter list example
Simple example code filter list using the for loop and if-else statements.
profits = [200, 400, 90, 50, 20, 150] res =  for p in profits: if p >= 100: res.append(p) print(res) print(type(res))
Using List Comprehension
This translates method one into a single line of code.
scores = [200, 105, 18, 80, 150, 140] res = [s for s in scores if s >= 150] print(res)
import re students = ["Abid", "Natasha", "Nick", "Matthew"] # regex pattern pattern = "N.*" # Match pattern using list comprehension res = [x for x in students if re.match(pattern, x)] print(res)
Using filter() Method
filter() is a built-in Python function to filter list items. It requires a filter function and a list.
def filter_height(height): if (height < 150): return True else: return False heights = [140, 180, 165, 162, 145] res = filter(filter_height, heights) print(list(res))
Using Lambda Function
You can convert method four (filter() Method) into a single line by using the lambda function.
ages = [20, 33, 44, 66, 78, 92] res = filter(lambda a: a > 50, ages) print(list(res))
Do comment if you have any doubts or suggestions on this Python filter topic.
Note: IDE: PyCharm 2021.3.3 (Community Edition)
All Python Examples are in Python 3, so Maybe its different from python 2 or upgraded versions.
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