only one ticker

opinion.md

@@ -1,12 +1,12 @@
 # My Opinion on jQuantStats
 
-## Overview
+## 📊 Overview
 
 jQuantStats is a Python library for portfolio analytics aimed at quants and portfolio managers. It's a modernized fork
 of QuantStats, focusing on providing a clean API with enhanced visualization capabilities using Plotly instead of
 Matplotlib.
 
-## Strengths
+## 💪 Strengths
 
 ### Code Quality
 
@@ -38,7 +38,7 @@ Matplotlib.
 - **CI/CD Integration**: GitHub Actions workflows for continuous integration.
 - **Pre-commit Hooks**: Ensures code quality before commits.
 
-## Areas for Improvement
+## 🔍 Areas for Improvement
 
 ### Documentation
 
@@ -53,7 +53,7 @@ removed with the intention to bring them back later.
 
 - The version number (0.0.0) indicates this is still in very early development.
 
-## Conclusion
+## 🏁 Conclusion
 
 jQuantStats is a well-designed, modern Python library that shows excellent
 software engineering practices. The code is clean, well-tested, and follows

src/jquantstats/_plots.py

@@ -90,14 +90,20 @@ def hex_to_rgba(hex_color: str, alpha: float = 0.5) -> str:
         # Get monthly returns values as a list for coloring
         monthly_values = monthly_returns[ticker].to_list()
 
+        # If there's only one ticker, use green for positive returns and red for negative returns
+        if len(tickers) == 1:
+            bar_colors = ["green" if val > 0 else "red" for val in monthly_values]
+        else:
+            bar_colors = [COLORS[ticker] if val > 0 else COLORS[f"{ticker}_light"] for val in monthly_values]
+
         fig.add_trace(
             go.Bar(
                 x=monthly_returns[date_col],
                 y=monthly_returns[ticker],
                 name=ticker,
                 legendgroup=ticker,
                 marker=dict(
-                    color=[COLORS[ticker] if val > 0 else COLORS[f"{ticker}_light"] for val in monthly_values],
+                    color=bar_colors,
                     line=dict(width=0),
                 ),
                 opacity=0.8,

src/tests/test_plots.py

@@ -1,5 +1,7 @@
 import pytest
 
+from jquantstats import build_data
+
 
 @pytest.fixture
 def plots(data):
@@ -39,3 +41,11 @@ def test_plot_snapshot(plots):
 
     # causing sometimes problems
     # fig.show()
+
+def test_plot_snapshot_one_symbol(returns):
+    fig = build_data(returns=returns).plots.plot_snapshot()
+
+    assert fig is not None
+    assert hasattr(fig, 'show')
+    # causing sometimes problems
+    # fig.show()