{
  "__type": "IngestedDoc",
  "__tag": 4010,
  "_content": {
    "Notes": {
      "__type": "Section",
      "__tag": 4015,
      "children": [],
      "title": [],
      "level": 0,
      "target": null
    },
    "Warns": {
      "__type": "Section",
      "__tag": 4015,
      "children": [],
      "title": [],
      "level": 0,
      "target": null
    },
    "Raises": {
      "__type": "Section",
      "__tag": 4015,
      "children": [],
      "title": [],
      "level": 0,
      "target": null
    },
    "Yields": {
      "__type": "Section",
      "__tag": 4015,
      "children": [],
      "title": [],
      "level": 0,
      "target": null
    },
    "Methods": {
      "__type": "Section",
      "__tag": 4015,
      "children": [],
      "title": [],
      "level": 0,
      "target": null
    },
    "Returns": {
      "__type": "Section",
      "__tag": 4015,
      "children": [],
      "title": [],
      "level": 0,
      "target": null
    },
    "Summary": {
      "__type": "Section",
      "__tag": 4015,
      "children": [
        {
          "__type": "Paragraph",
          "__tag": 4045,
          "children": [
            {
              "__type": "Text",
              "__tag": 4046,
              "value": "Time execution of a Python statement or expression"
            }
          ]
        }
      ],
      "title": [],
      "level": 0,
      "target": null
    },
    "Receives": {
      "__type": "Section",
      "__tag": 4015,
      "children": [],
      "title": [],
      "level": 0,
      "target": null
    },
    "Warnings": {
      "__type": "Section",
      "__tag": 4015,
      "children": [],
      "title": [],
      "level": 0,
      "target": null
    },
    "Attributes": {
      "__type": "Section",
      "__tag": 4015,
      "children": [],
      "title": [],
      "level": 0,
      "target": null
    },
    "Parameters": {
      "__type": "Section",
      "__tag": 4015,
      "children": [],
      "title": [],
      "level": 0,
      "target": null
    },
    "Extended Summary": {
      "__type": "Section",
      "__tag": 4015,
      "children": [
        {
          "__type": "Paragraph",
          "__tag": 4045,
          "children": [
            {
              "__type": "Strong",
              "__tag": 4048,
              "children": [
                {
                  "__type": "Text",
                  "__tag": 4046,
                  "value": "Usage, in line mode"
                }
              ]
            },
            {
              "__type": "Text",
              "__tag": 4046,
              "value": "    "
            }
          ]
        },
        {
          "__type": "Code",
          "__tag": 4050,
          "value": "%timeit [-n<N> -r<R> [-t|-c] -q -p<P> [-o|-v <V>]] statement",
          "execution_status": null
        },
        {
          "__type": "Paragraph",
          "__tag": 4045,
          "children": [
            {
              "__type": "Strong",
              "__tag": 4048,
              "children": [
                {
                  "__type": "Text",
                  "__tag": 4046,
                  "value": "or in cell mode"
                }
              ]
            },
            {
              "__type": "Text",
              "__tag": 4046,
              "value": "    "
            }
          ]
        },
        {
          "__type": "Code",
          "__tag": 4050,
          "value": "%%timeit [-n<N> -r<R> [-t|-c] -q -p<P> [-o|-v <V>]] setup_code\ncode\ncode...",
          "execution_status": null
        },
        {
          "__type": "Paragraph",
          "__tag": 4045,
          "children": [
            {
              "__type": "Text",
              "__tag": 4046,
              "value": "Time execution of a Python statement or expression using the timeit module.  This function can be used both as a line and cell magic:"
            }
          ]
        },
        {
          "__type": "BulletList",
          "__tag": 4053,
          "ordered": false,
          "start": 1,
          "children": [
            {
              "__type": "ListItem",
              "__tag": 4054,
              "children": [
                {
                  "__type": "Paragraph",
                  "__tag": 4045,
                  "children": [
                    {
                      "__type": "Text",
                      "__tag": 4046,
                      "value": "In line mode you can time a single-line statement (though multiple   ones can be chained with using semicolons)."
                    }
                  ]
                }
              ]
            },
            {
              "__type": "ListItem",
              "__tag": 4054,
              "children": [
                {
                  "__type": "Paragraph",
                  "__tag": 4045,
                  "children": [
                    {
                      "__type": "Text",
                      "__tag": 4046,
                      "value": "In cell mode, the statement in the first line is used as setup code   (executed but not timed) and the body of the cell is timed.  The cell   body has access to any variables created in the setup code."
                    }
                  ]
                }
              ]
            }
          ]
        },
        {
          "__type": "Paragraph",
          "__tag": 4045,
          "children": [
            {
              "__type": "Text",
              "__tag": 4046,
              "value": "Options:"
            }
          ]
        },
        {
          "__type": "DefList",
          "__tag": 4033,
          "children": [
            {
              "__type": "DefListItem",
              "__tag": 4037,
              "dt": {
                "__type": "Paragraph",
                "__tag": 4045,
                "children": [
                  {
                    "__type": "Text",
                    "__tag": 4046,
                    "value": "-n<N>"
                  }
                ]
              },
              "dd": [
                {
                  "__type": "Paragraph",
                  "__tag": 4045,
                  "children": [
                    {
                      "__type": "Text",
                      "__tag": 4046,
                      "value": "Execute the given statement N times in a loop. If N is not   provided, N is determined so as to get sufficient accuracy."
                    }
                  ]
                }
              ]
            },
            {
              "__type": "DefListItem",
              "__tag": 4037,
              "dt": {
                "__type": "Paragraph",
                "__tag": 4045,
                "children": [
                  {
                    "__type": "Text",
                    "__tag": 4046,
                    "value": "-r<R>"
                  }
                ]
              },
              "dd": [
                {
                  "__type": "Paragraph",
                  "__tag": 4045,
                  "children": [
                    {
                      "__type": "Text",
                      "__tag": 4046,
                      "value": "Number of repeats R, each consisting of N loops, and take the   average result.   Default: 7"
                    }
                  ]
                }
              ]
            },
            {
              "__type": "DefListItem",
              "__tag": 4037,
              "dt": {
                "__type": "Paragraph",
                "__tag": 4045,
                "children": [
                  {
                    "__type": "Text",
                    "__tag": 4046,
                    "value": "-t"
                  }
                ]
              },
              "dd": [
                {
                  "__type": "Paragraph",
                  "__tag": 4045,
                  "children": [
                    {
                      "__type": "Text",
                      "__tag": 4046,
                      "value": "Use "
                    },
                    {
                      "__type": "InlineCode",
                      "__tag": 4051,
                      "value": "time.time"
                    },
                    {
                      "__type": "Text",
                      "__tag": 4046,
                      "value": " to measure the time, which is the default on Unix.   This function measures wall time."
                    }
                  ]
                }
              ]
            },
            {
              "__type": "DefListItem",
              "__tag": 4037,
              "dt": {
                "__type": "Paragraph",
                "__tag": 4045,
                "children": [
                  {
                    "__type": "Text",
                    "__tag": 4046,
                    "value": "-c"
                  }
                ]
              },
              "dd": [
                {
                  "__type": "Paragraph",
                  "__tag": 4045,
                  "children": [
                    {
                      "__type": "Text",
                      "__tag": 4046,
                      "value": "Use "
                    },
                    {
                      "__type": "InlineCode",
                      "__tag": 4051,
                      "value": "time.clock"
                    },
                    {
                      "__type": "Text",
                      "__tag": 4046,
                      "value": " to measure the time, which is the default on   Windows and measures wall time. On Unix, "
                    },
                    {
                      "__type": "InlineCode",
                      "__tag": 4051,
                      "value": "resource.getrusage"
                    },
                    {
                      "__type": "Text",
                      "__tag": 4046,
                      "value": " is used   instead and returns the CPU user time."
                    }
                  ]
                }
              ]
            },
            {
              "__type": "DefListItem",
              "__tag": 4037,
              "dt": {
                "__type": "Paragraph",
                "__tag": 4045,
                "children": [
                  {
                    "__type": "Text",
                    "__tag": 4046,
                    "value": "-p<P>"
                  }
                ]
              },
              "dd": [
                {
                  "__type": "Paragraph",
                  "__tag": 4045,
                  "children": [
                    {
                      "__type": "Text",
                      "__tag": 4046,
                      "value": "Use a precision of P digits to display the timing result.   Default: 3"
                    }
                  ]
                }
              ]
            },
            {
              "__type": "DefListItem",
              "__tag": 4037,
              "dt": {
                "__type": "Paragraph",
                "__tag": 4045,
                "children": [
                  {
                    "__type": "Text",
                    "__tag": 4046,
                    "value": "-q"
                  }
                ]
              },
              "dd": [
                {
                  "__type": "Paragraph",
                  "__tag": 4045,
                  "children": [
                    {
                      "__type": "Text",
                      "__tag": 4046,
                      "value": "Quiet, do not print result."
                    }
                  ]
                }
              ]
            },
            {
              "__type": "DefListItem",
              "__tag": 4037,
              "dt": {
                "__type": "Paragraph",
                "__tag": 4045,
                "children": [
                  {
                    "__type": "Text",
                    "__tag": 4046,
                    "value": "-o"
                  }
                ]
              },
              "dd": [
                {
                  "__type": "Paragraph",
                  "__tag": 4045,
                  "children": [
                    {
                      "__type": "Text",
                      "__tag": 4046,
                      "value": "Return a "
                    },
                    {
                      "__type": "InlineCode",
                      "__tag": 4051,
                      "value": "TimeitResult"
                    },
                    {
                      "__type": "Text",
                      "__tag": 4046,
                      "value": " that can be stored in a variable to inspect   the result in more details."
                    }
                  ]
                }
              ]
            },
            {
              "__type": "DefListItem",
              "__tag": 4037,
              "dt": {
                "__type": "Paragraph",
                "__tag": 4045,
                "children": [
                  {
                    "__type": "Text",
                    "__tag": 4046,
                    "value": "-v <V>"
                  }
                ]
              },
              "dd": [
                {
                  "__type": "Paragraph",
                  "__tag": 4045,
                  "children": [
                    {
                      "__type": "Text",
                      "__tag": 4046,
                      "value": "Like "
                    },
                    {
                      "__type": "InlineCode",
                      "__tag": 4051,
                      "value": "-o"
                    },
                    {
                      "__type": "Text",
                      "__tag": 4046,
                      "value": ", but save the "
                    },
                    {
                      "__type": "InlineCode",
                      "__tag": 4051,
                      "value": "TimeitResult"
                    },
                    {
                      "__type": "Text",
                      "__tag": 4046,
                      "value": " directly to variable <V>."
                    }
                  ]
                }
              ]
            }
          ]
        },
        {
          "__type": "Admonition",
          "__tag": 4056,
          "kind": "versionchanged",
          "base_type": "neutral",
          "children": [
            {
              "__type": "AdmonitionTitle",
              "__tag": 4055,
              "children": [
                {
                  "__type": "Text",
                  "__tag": 4046,
                  "value": "versionchanged 7.3"
                }
              ]
            },
            {
              "__type": "Paragraph",
              "__tag": 4045,
              "children": [
                {
                  "__type": "Text",
                  "__tag": 4046,
                  "value": "User variables are no longer expanded, the magic line is always left unmodified."
                }
              ]
            }
          ]
        }
      ],
      "title": [],
      "level": 0,
      "target": null
    },
    "Other Parameters": {
      "__type": "Section",
      "__tag": 4015,
      "children": [],
      "title": [],
      "level": 0,
      "target": null
    }
  },
  "_ordered_sections": [
    "Summary",
    "Extended Summary",
    "Parameters",
    "Attributes",
    "Methods",
    "Returns",
    "Yields",
    "Receives",
    "Other Parameters",
    "Raises",
    "Warns",
    "Warnings",
    "Notes"
  ],
  "item_file": "/IPython/core/magics/execution.py",
  "item_line": 1046,
  "item_type": "function",
  "aliases": [
    "IPython.core.magics.ExecutionMagics.timeit"
  ],
  "example_section_data": {
    "__type": "Section",
    "__tag": 4015,
    "children": [
      {
        "__type": "Text",
        "__tag": 4046,
        "value": "::\n\n  In [1]: %timeit pass\n  8.26 ns ± 0.12 ns per loop (mean ± std. dev. of 7 runs, 100000000 loops each)\n\n  In [2]: u = None\n\n  In [3]: %timeit u is None\n  29.9 ns ± 0.643 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)\n\n  In [4]: %timeit -r 4 u == None\n\n  In [5]: import time\n\n  In [6]: %timeit -n1 time.sleep(2)\n\nThe times reported by ``%timeit`` will be slightly higher than those\nreported by the timeit.py script when variables are accessed. This is\ndue to the fact that ``%timeit`` executes the statement in the namespace\nof the shell, compared with timeit.py, which uses a single setup\nstatement to import function or create variables. Generally, the bias\ndoes not matter as long as results from timeit.py are not mixed with\nthose from ``%timeit``."
      }
    ],
    "title": [],
    "level": 0,
    "target": null
  },
  "see_also": [],
  "signature": {
    "__type": "SignatureNode",
    "__tag": 4029,
    "kind": "function",
    "parameters": [
      {
        "__type": "SigParam",
        "__tag": 4030,
        "name": "self",
        "annotation": {
          "__type": "Empty",
          "__tag": 4031
        },
        "kind": "POSITIONAL_OR_KEYWORD",
        "default": {
          "__type": "Empty",
          "__tag": 4031
        }
      },
      {
        "__type": "SigParam",
        "__tag": 4030,
        "name": "line",
        "annotation": {
          "__type": "Empty",
          "__tag": 4031
        },
        "kind": "POSITIONAL_OR_KEYWORD",
        "default": ""
      },
      {
        "__type": "SigParam",
        "__tag": 4030,
        "name": "cell",
        "annotation": {
          "__type": "Empty",
          "__tag": 4031
        },
        "kind": "POSITIONAL_OR_KEYWORD",
        "default": "None"
      },
      {
        "__type": "SigParam",
        "__tag": 4030,
        "name": "local_ns",
        "annotation": {
          "__type": "Empty",
          "__tag": 4031
        },
        "kind": "POSITIONAL_OR_KEYWORD",
        "default": "None"
      }
    ],
    "return_annotation": {
      "__type": "Empty",
      "__tag": 4031
    },
    "target_name": "timeit"
  },
  "references": null,
  "qa": "IPython.core.magics.execution:ExecutionMagics.timeit",
  "arbitrary": [],
  "local_refs": []
}