ENH: Add tqdm to skopt optimization (kernc#282)

* ENH: Add tqdm to skopt

* MNT: Format long line

* ENH: Pass max_tries as total len, update desc wording

* ENH: Replace skopt class with variable

* ENH: Pass single skopt callback directly instead of in a list

* ENH: Check if tqdm object has update attr

* MNT: Update tqdm description text

* FMT: Use single quotes

* MNT: Refactor pbar to use iter

* MNT: Refactor to meet max line length

* bikeshedding

Fixes kernc#280

Author: crazy25000

backtesting/backtesting.py

@@ -1357,7 +1357,8 @@ def _batch(seq):
                     with ProcessPoolExecutor() as executor:
                         futures = [executor.submit(Backtest._mp_task, backtest_uuid, i)
                                    for i in range(len(param_batches))]
-                        for future in _tqdm(as_completed(futures), total=len(futures)):
+                        for future in _tqdm(as_completed(futures), total=len(futures),
+                                            desc='Backtest.optimize'):
                             batch_index, values = future.result()
                             for value, params in zip(values, param_batches[batch_index]):
                                 heatmap[tuple(params.values())] = value
@@ -1425,9 +1426,11 @@ def _optimize_skopt() -> Union[pd.Series,
 
             # np.inf/np.nan breaks sklearn, np.finfo(float).max breaks skopt.plots.plot_objective
             INVALID = 1e300
+            progress = iter(_tqdm(repeat(None), total=max_tries, desc='Backtest.optimize'))
 
             @use_named_args(dimensions=dimensions)
             def objective_function(**params):
+                next(progress)
                 # Check constraints
                 # TODO: Adjust after https://github.com/scikit-optimize/scikit-optimize/pull/971
                 if not constraint(AttrDict(params)):