| # Timings of CPython Operations |
| |
| Here are some *very rough* approximate timings of CPython interpreter |
| operations: |
| |
| * `f(1)` (empty function body): 70-90ns |
| * `f(n=1)` (empty function body): 90-110ns |
| * `o.x`: 30-40ns |
| * `o.f(1)` (empty method body): 80-160ns |
| * `Cls(1)` (initialize attribute in `__init__`): 290-330ns |
| * `x + y` (integers): 20-35ns |
| * `a[i]` (list) : 20-40ns |
| * `[i]` (also dealloc): 35-55ns |
| * `a.append(i)` (list, average over 5 appends): 70ns |
| * `d[s]` (dict, shared str key): 20ns |
| * `d[s] = i` (dict, shared str key): 40ns |
| * `isinstance(x, A)`: 100ns |
| * `(x, y)`: 20-35ns |
| * `x, y = t` (tuple expand): 10ns |
| |
| Note that these results are very imprecise due to many factors, but |
| these should give a rough idea of the relative costs of various |
| operations. |
| |
| Details: CPython 3.6.2, Macbook Pro 15" (Mid 2015), macOS Sierra |
