otp.Source.add_prefix#

Source.add_prefix(prefix, inplace=False)[source]#

Addes prefix to all column names.

Parameters

  • prefix (str) – String prefix to add to all columns.

  • inplace (bool) – The flag controls whether operation should be applied inplace or not. If inplace=True, then it returns nothing. Otherwise method returns a new modified object.

Return type

Source or None

Examples

>>> data = otp.DataSource(db='SOME_DB', tick_type='TT', symbols='S1')
>>> data = data.add_prefix('test_')
>>> otp.run(data)
                     Time  test_X
0 2003-12-01 00:00:00.000       1
1 2003-12-01 00:00:00.001       2
2 2003-12-01 00:00:00.002       3

>>> data.schema
{'test_X': <class 'int'>}

>>> data = otp.DataSource(db='NYSE_TAQ', tick_type='TRD', symbols='AAPL')
>>> data = data.add_prefix('test_')
>>> otp.run(data, start=otp.dt(2022, 3, 1), end=otp.dt(2022, 3, 2))
                     Time  test_PRICE  test_SIZE
0 2022-03-01 00:00:00.000         1.3        100
1 2022-03-01 00:00:00.001         1.4         10
2 2022-03-01 00:00:00.002         1.4         50

>>> data.schema
{'test_PRICE': <class 'float'>}

>>> data = otp.Tick(X=1, XX=2)
>>> data.add_prefix('X')
Traceback (most recent call last):
  ...
AttributeError: Column XX already exists, please, use another prefix