otp.Source.__setitem__

Source.__setitem__(key, value)

Add new column to the source or update existing one.

Parameters

• key (str) – The name of the new or existing column.

• value (int, str, float, datetime.datetime, datetime.date, Column, Operation, string, otp.date, otp.datetime, nsectime, msectime) – The new value of the column.

• self (Source) –

Examples

>>> data = otp.Tick(A='A')
>>> data['D'] = otp.datetime(2022, 2, 2)
>>> data['X'] = 1
>>> data['Y'] = data['X']
>>> data['X'] = 12345
>>> data['Z'] = data['Y'].astype(str) + 'abc'
>>> otp.run(data)
        Time  A          D      X  Y     Z
0 2003-12-01  A 2022-02-02  12345  1  1abc

See also

ADD_FIELD OneTick event processor

UPDATE_FIELD OneTick event processor