Simplifies code in Data Providers and enhances API reference

[edoaltamura]

Summary

Simplifies the usage in data providers and enhances documentation.

Details and comments

BaseDataProvider: eliminates code repetitions when checking for self._data and adds more documentation in API reference.
RandomDataProvider, WikipediaDataProvider, YahooDataProvider: adds more documentation in API reference.
RandomDataProvider: replaces unnecessary calls to Pandas with more readable Numpy functions.

✅ I have added the tests to cover my changes.
✅ I have updated the documentation accordingly.
✅ I have read the CONTRIBUTING document.

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[woodsp-ibm]

@edoaltamura This has been inactive for sometime, did you want to complete this off? You need at least to add from __future__ import annotations into some of these to allow the use of | in earlier Python versions.

[edoaltamura]

I can make time to finalize it this coming week!

[coveralls]

Pull Request Test Coverage Report for Build 9467495943

Details

• 49 of 75 (65.33%) changed or added relevant lines in 6 files are covered.
• 4 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.08%) to 75.743%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
qiskit_finance/data_providers/_base_data_provider.py	20	21	95.24%
qiskit_finance/data_providers/random_data_provider.py	15	16	93.75%
qiskit_finance/data_providers/yahoo_data_provider.py	6	7	85.71%
qiskit_finance/data_providers/wikipedia_data_provider.py	5	7	71.43%
qiskit_finance/data_providers/exchange_data_provider.py	2	10	20.0%
qiskit_finance/data_providers/data_on_demand_provider.py	1	14	7.14%

Files with Coverage Reduction	New Missed Lines	%
qiskit_finance/data_providers/_base_data_provider.py	1	85.33%
qiskit_finance/data_providers/exchange_data_provider.py	1	18.03%
qiskit_finance/data_providers/data_on_demand_provider.py	2	27.66%

Totals
Change from base Build 9155947037:	-0.08%
Covered Lines:	612
Relevant Lines:	808

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 9479500352

Details

• 49 of 75 (65.33%) changed or added relevant lines in 6 files are covered.
• 7 unchanged lines in 4 files lost coverage.
• Overall coverage increased (+0.04%) to 75.866%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
qiskit_finance/data_providers/_base_data_provider.py	20	21	95.24%
qiskit_finance/data_providers/random_data_provider.py	15	16	93.75%
qiskit_finance/data_providers/yahoo_data_provider.py	6	7	85.71%
qiskit_finance/data_providers/wikipedia_data_provider.py	5	7	71.43%
qiskit_finance/data_providers/exchange_data_provider.py	2	10	20.0%
qiskit_finance/data_providers/data_on_demand_provider.py	1	14	7.14%

Files with Coverage Reduction	New Missed Lines	%
qiskit_finance/data_providers/_base_data_provider.py	1	85.33%
qiskit_finance/data_providers/exchange_data_provider.py	1	18.03%
qiskit_finance/data_providers/data_on_demand_provider.py	2	27.66%
qiskit_finance/data_providers/wikipedia_data_provider.py	3	64.58%

Totals
Change from base Build 9155947037:	0.04%
Covered Lines:	613
Relevant Lines:	808

---

💛 - Coveralls

[woodsp-ibm]

I made the comment above but as I said I think its ok. This is something that could always be improved in the future unless you'd like to course.

[edoaltamura]

I updated the method bindings also in a couple of other places where relevant. I like working on the details! 🙂

[coveralls]

Pull Request Test Coverage Report for Build 9491153560

Details

• 49 of 75 (65.33%) changed or added relevant lines in 6 files are covered.
• 4 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.08%) to 75.743%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
qiskit_finance/data_providers/_base_data_provider.py	20	21	95.24%
qiskit_finance/data_providers/random_data_provider.py	15	16	93.75%
qiskit_finance/data_providers/yahoo_data_provider.py	6	7	85.71%
qiskit_finance/data_providers/wikipedia_data_provider.py	5	7	71.43%
qiskit_finance/data_providers/exchange_data_provider.py	2	10	20.0%
qiskit_finance/data_providers/data_on_demand_provider.py	1	14	7.14%

Files with Coverage Reduction	New Missed Lines	%
qiskit_finance/data_providers/_base_data_provider.py	1	85.33%
qiskit_finance/data_providers/exchange_data_provider.py	1	18.03%
qiskit_finance/data_providers/data_on_demand_provider.py	2	27.66%

Totals
Change from base Build 9155947037:	-0.08%
Covered Lines:	612
Relevant Lines:	808

---

💛 - Coveralls

[woodsp-ibm]

Thanks for persisting with this. It all seems good to me now.