Example of how to query IPython history, searching using a known string used in a session and then using the session_id from the first query to get the whole of that session.

ipython_history_query.py

#Example of searching for a string in IPython sqlite history
from IPython.core.history import HistoryAccessor
history_accessor = HistoryAccessor()
sqlite_cursor = history_accessor.search('*threshold*')
results = sqlite_cursor.fetchall()
for result in results:
    print result
#From the first number in the printed results you can see the relevant session 
#number, and then below retrieve the whole session using get_range
session_results = history_accessor.get_range(1321)
for session, line_number, command in session_results:
    print command
#Test