Note

This documentation is for a development version of IPython. There may be significant differences from the latest stable release (1.2.1).

Module: core.history

History related magics and functionality

5 Classes

class IPython.core.history.DummyDB

Bases: object

Dummy DB that will act as a black hole for history.

Only used in the absence of sqlite

class IPython.core.history.DatabaseError

Bases: sqlite3.Error

class IPython.core.history.HistoryAccessor(profile='default', hist_file=u'', **traits)

Bases: IPython.config.configurable.Configurable

Access the history database without adding to it.

This is intended for use by standalone history tools. IPython shells use HistoryManager, below, which is a subclass of this.

__init__(profile='default', hist_file=u'', **traits)

Create a new history accessor.

Parameters:

profile : str

The name of the profile from which to open history.

hist_file : str

Path to an SQLite history database stored by IPython. If specified, hist_file overrides profile.

config :

Config object. hist_file can also be set through this.

get_last_session_id()

Get the last session ID currently in the database.

Within IPython, this should be the same as the value stored in HistoryManager.session_number.

get_range(session, start=1, stop=None, raw=True, output=False)

Retrieve input by session.

Parameters:

session : int

Session number to retrieve.

start : int

First line to retrieve.

stop : int

End of line range (excluded from output itself). If None, retrieve to the end of the session.

raw : bool

If True, return untranslated input

output : bool

If True, attempt to include output. This will be ‘real’ Python objects for the current session, or text reprs from previous sessions if db_log_output was enabled at the time. Where no output is found, None is used.

Returns:

An iterator over the desired lines. Each line is a 3-tuple, either

(session, line, input) if output is False, or

(session, line, (input, output)) if output is True.

get_range_by_str(rangestr, raw=True, output=False)

Get lines of history from a string of ranges, as used by magic commands %hist, %save, %macro, etc.

Parameters:

rangestr : str

A string specifying ranges, e.g. “5 ~2/1-4”. See magic_history() for full details.

raw, output : bool

As get_range()

Returns:

Tuples as get_range()

get_session_info(session=0)

get info about a session

Parameters:

session : int

Session number to retrieve.

Returns:

session_id : int

Session ID number

start : datetime

Timestamp for the start of the session.

end : datetime

Timestamp for the end of the session, or None if IPython crashed.

num_cmds : int

Number of commands run, or None if IPython crashed.

remark : unicode

A manually set description.

get_tail(n=10, raw=True, output=False, include_latest=False)

Get the last n lines from the history database.

Parameters:

n : int

The number of lines to get

raw, output : bool

See get_range()

include_latest : bool

If False (default), n+1 lines are fetched, and the latest one is discarded. This is intended to be used where the function is called by a user command, which it should not return.

Returns:

Tuples as get_range()

init_db()

Connect to the database, and create tables if necessary.

search(pattern='*', raw=True, search_raw=True, output=False, n=None, unique=False)

Search the database using unix glob-style matching (wildcards * and ?).

Parameters:

pattern : str

The wildcarded pattern to match when searching

search_raw : bool

If True, search the raw input, otherwise, the parsed input

raw, output : bool

See get_range()

n : None or int

If an integer is given, it defines the limit of returned entries.

unique : bool

When it is true, return only unique entries.

Returns:

Tuples as get_range()

writeout_cache()

Overridden by HistoryManager to dump the cache before certain database lookups.

class IPython.core.history.HistoryManager(shell=None, config=None, **traits)

Bases: IPython.core.history.HistoryAccessor

A class to organize all history-related functionality in one place.

__init__(shell=None, config=None, **traits)

Create a new history manager associated with a shell instance.

end_session()

Close the database session, filling in the end time and line count.

get_range(session=0, start=1, stop=None, raw=True, output=False)

Retrieve input by session.

Parameters:

session : int

Session number to retrieve. The current session is 0, and negative numbers count back from current session, so -1 is previous session.

start : int

First line to retrieve.

stop : int

End of line range (excluded from output itself). If None, retrieve to the end of the session.

raw : bool

If True, return untranslated input

output : bool

If True, attempt to include output. This will be ‘real’ Python objects for the current session, or text reprs from previous sessions if db_log_output was enabled at the time. Where no output is found, None is used.

Returns:

An iterator over the desired lines. Each line is a 3-tuple, either

(session, line, input) if output is False, or

(session, line, (input, output)) if output is True.

get_session_info(session=0)

get info about a session

Parameters:

session : int

Session number to retrieve. The current session is 0, and negative numbers count back from current session, so -1 is previous session.

Returns:

session_id : int

Session ID number

start : datetime

Timestamp for the start of the session.

end : datetime

Timestamp for the end of the session, or None if IPython crashed.

num_cmds : int

Number of commands run, or None if IPython crashed.

remark : unicode

A manually set description.

name_session(name)

Give the current session a name in the history database.

new_session(conn=None)

Get a new session number.

reset(new_session=True)

Clear the session history, releasing all object references, and optionally open a new session.

store_inputs(line_num, source, source_raw=None)

Store source and raw input in history and create input cache variables _i*.

Parameters:

line_num : int

The prompt number of this input.

source : str

Python input.

source_raw : str, optional

If given, this is the raw input without any IPython transformations applied to it. If not given, source is used.

store_output(line_num)

If database output logging is enabled, this saves all the outputs from the indicated prompt number to the database. It’s called by run_cell after code has been executed.

Parameters:

line_num : int

The line number from which to save outputs

writeout_cache(conn=None)

Write any entries in the cache to the database.

class IPython.core.history.HistorySavingThread(history_manager)

Bases: threading.Thread

This thread takes care of writing history to the database, so that the UI isn’t held up while that happens.

It waits for the HistoryManager’s save_flag to be set, then writes out the history cache. The main thread is responsible for setting the flag when the cache size reaches a defined threshold.

__init__(history_manager)

stop()

This can be called from the main thread to safely stop this thread.

Note that it does not attempt to write out remaining history before exiting. That should be done by calling the HistoryManager’s end_session method.

3 Functions

IPython.core.history.needs_sqlite(f)

return an empty list in the absence of sqlite

IPython.core.history.catch_corrupt_db(f)

A decorator which wraps HistoryAccessor method calls to catch errors from a corrupt SQLite database, move the old database out of the way, and create a new one.

IPython.core.history.extract_hist_ranges(ranges_str)

Turn a string of history ranges into 3-tuples of (session, start, stop).

Examples

list(extract_input_ranges(“~8/5-~7/4 2”)) [(-8, 5, None), (-7, 1, 4), (0, 2, 3)]