fix(plot-series): remove label from arguments and set it with kwargs

If `label` is not in the kwargs, set the default value as the column
name. Same principle is applied for `lw` and `linewidth`.

README.md

@@ -54,6 +54,7 @@ As of *v0.2*, plots are not yet tested in the travis build.
     * ADD: Function ``set_thousands_separator`` to add thousand separator and set the number of decimals on x and/or y ticks.
     * ADD: Option to define x axis in ``plot_predictions`` function.
     * FIX: Cast columns to string in ``normalization_pd`` function.
+    * FIX: Add possibility to define custom label in ``plot_series`` function using the kwargs instead of an argument.
 * 0.2.3
     * ADD: Function ``normalization_pd`` to normalize a DataFrame.
     * ADD: Function ``plot_correlation`` to plot the correlation of variables in a DataFrame.

bff/plot/plot.py

@@ -589,7 +589,15 @@ def plot_series(df: pd.DataFrame, column: str, groupby: Union[str, None] = None,
 
         x = df_plot.index
 
-        ax.plot(x, df_plot, label=column, color=color, lw=2, **kwargs)
+        # If the label is not provided, set the column as label.
+        if 'label' not in kwargs:
+            kwargs['label'] = column
+
+        # Set default linewidth if none of the possible arguments are provided.
+        if not any(k in kwargs for k in ['lw', 'linewidth']):
+            kwargs['lw'] = 2
+
+        ax.plot(x, df_plot, color=color, **kwargs)
 
         # With sem (standard error of the mean).
         sem_alpha = 0.3