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Diffstat (limited to 'Doc/faq/programming.rst')
| -rw-r--r-- | Doc/faq/programming.rst | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/Doc/faq/programming.rst b/Doc/faq/programming.rst index f3c5b0f..584d33e 100644 --- a/Doc/faq/programming.rst +++ b/Doc/faq/programming.rst @@ -1279,13 +1279,25 @@ Or, you can use an extension that provides a matrix datatype; `NumPy <https://numpy.org/>`_ is the best known. -How do I apply a method to a sequence of objects? -------------------------------------------------- +How do I apply a method or function to a sequence of objects? +------------------------------------------------------------- -Use a list comprehension:: +To call a method or function and accumulate the return values is a list, +a :term:`list comprehension` is an elegant solution:: result = [obj.method() for obj in mylist] + result = [function(obj) for obj in mylist] + +To just run the method or function without saving the return values, +a plain :keyword:`for` loop will suffice:: + + for obj in mylist: + obj.method() + + for obj in mylist: + function(obj) + .. _faq-augmented-assignment-tuple-error: Why does a_tuple[i] += ['item'] raise an exception when the addition works? |