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GeezerVison is showing github.com — learn-python/src/functions/test_lambda_expressions.py at master · BlackHacked/learn-python Expand file tree/ Copy pathtest_lambda_expressions.pyMore file actions 34 lines (24 loc) · 1.31 KB / Copy pathtest_lambda_expressions.pyFile metadata and controls34 lines (24 loc) · 1.31 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 """Lambda Expressions @see: https://docs.python.org/3/tutorial/controlflow.html#lambda-expressions Small anonymous functions can be created with the lambda keyword. Lambda functions can be used wherever function objects are required. They are syntactically restricted to a single expression. Semantically, they are just syntactic sugar for a normal function definition. Like nested function definitions, lambda functions can reference variables from the containing scope. """ def test_lambda_expressions(): """Lambda Expressions""" # This function returns the sum of its two arguments: lambda a, b: a+b # Like nested function definitions, lambda functions can reference variables from the # containing scope. def make_increment_function(delta): """This example uses a lambda expression to return a function""" return lambda number: number + delta increment_function = make_increment_function(42) assert increment_function(0) == 42 assert increment_function(1) == 43 assert increment_function(2) == 44 # Another use of lambda is to pass a small function as an argument. pairs = [(1, 'one'), (2, 'two'), (3, 'three'), (4, 'four')] # Sort pairs by text key. pairs.sort(key=lambda pair: pair[1]) assert pairs == [(4, 'four'), (1, 'one'), (3, 'three'), (2, 'two')] |
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