otp.MultiOutputSource

class MultiOutputSource

Bases: object

Construct a source object with multiple outputs from several connected Source objects.

This object can be saved to disk as a graph using to_otq() method, or passed to onetick.py.run() function.

If it’s passed to onetick.py.run(), then returned results for different outputs will be available as a dictionary.

Parameters

outputs (dict) – Dictionary which keys are names of the output sources, and values are output sources themselves. All the passed sources should be connected.

Examples

Results for individual outputs can be accessed by output names

>>> root = otp.Tick(A=1)
>>> branch_1 = root.copy()
>>> branch_2 = root.copy()
>>> branch_3 = root.copy()
>>> branch_1['B'] = 1
>>> branch_2['B'] = 2
>>> branch_3['B'] = 3
>>> src = otp.MultiOutputSource(dict(BRANCH1=branch_1, BRANCH2=branch_2, BRANCH3=branch_3))
>>> res = otp.run(src)
>>> sorted(list(res.keys()))
['BRANCH1', 'BRANCH2', 'BRANCH3']
>>> res['BRANCH1'][['A', 'B']]
   A  B
0  1  1
>>> res['BRANCH2'][['A', 'B']]
   A  B
0  1  2
>>> res['BRANCH3'][['A', 'B']]
   A  B
0  1  3

node_name parameter of the otp.run() method can be used to select outputs

>>> src = otp.MultiOutputSource(dict(BRANCH1=branch_1, BRANCH2=branch_2, BRANCH3=branch_3))
>>> res = otp.run(src, node_name=['BRANCH2', 'BRANCH3'])
>>> sorted(list(res.keys()))
['BRANCH2', 'BRANCH3']
>>> res['BRANCH2'][['A', 'B']]
   A  B
0  1  2
>>> res['BRANCH3'][['A', 'B']]
   A  B
0  1  3

If only one output is selected, then it’s returned directly and not in a dictionary

>>> src = otp.MultiOutputSource(dict(BRANCH1=branch_1, BRANCH2=branch_2, BRANCH3=branch_3))
>>> res = otp.run(src, node_name='BRANCH2')
>>> res[['A', 'B']]
   A  B
0  1  2

A dictionary with sources can also be passed to otp.run directly, and MultiOutputSource object will be constructed internally

>>> res = otp.run(dict(BRANCH1=branch_1, BRANCH2=branch_2))
>>> res['BRANCH1'][['A', 'B']]
   A  B
0  1  1
>>> res['BRANCH2'][['A', 'B']]
   A  B
0  1  2

get_branch(branch_name)

Retrieve a branch by its name.

Parameters

branch_name (str) – The name of the branch to retrieve.

Returns

The branch corresponding to the given name.

Return type

otp.Source

property main_branch: onetick.py.core.source.Source

Get the main branch.

Returns

The main branch.

Return type

otp.Source

to_otq(file_name=None, file_suffix=None, query_name=None, symbols=None, start=None, end=None, timezone=None)

Constructs an onetick query graph and saves it to disk

See also

onetick.py.Source.to_otq()