Add Plotly versions for exercise 12

exercises/exercise_12_0_0_plotly.py

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+import plotly.graph_objs as go
+
+x = [0, 1]
+y = [1, 0]
+
+fig = go.Figure(data=go.Scatter(x=x, y=y, mode='lines'))
+
+fig.show()

exercises/exercise_12_0_1_plotly.py

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+import plotly.graph_objs as go
+
+x = [0, 1]
+y = [1, 0]
+
+fig = go.Figure(data=go.Scatter(x=x, y=y, mode='lines', line=dict(color='rgba(0, 128, 0, 0.4)', width=10), name="straight line"))
+
+fig.update_layout(title="My first plot", showlegend=True, xaxis=dict(showgrid=True), yaxis=dict(showgrid=True))
+
+fig.show()

exercises/exercise_12_0_2_plotly.py

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+import numpy as np
+import plotly.graph_objs as go
+
+x = np.linspace(-3, 3, 200)
+y = 4 * x ** 3 + x ** 2
+
+fig = go.Figure(data=go.Scatter(x=x, y=y, mode='lines', line=dict(color='black'), name="f(x)"))
+
+fig.update_layout(title="f(x)", showlegend=True, xaxis=dict(showgrid=True), yaxis=dict(showgrid=True))
+
+fig.show()

exercises/exercise_12_0_3_plotly.py

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+import numpy as np
+import plotly.graph_objs as go
+
+x = np.linspace(-3, 3, 200)
+y = np.exp(x**2)**-0.5
+
+fig = go.Figure()
+
+fig.add_trace(go.Scatter(x=x, y=y, mode='lines', line=dict(color='black'), name="f(x)"))
+
+highlighted_region_1 = np.where((x > -3) & (x < -1), y, None)
+highlighted_region_2 = np.where((x > 1) & (x < 3), y, None)
+
+fig.add_trace(go.Scatter(x=x, y=highlighted_region_1, fill='tozeroy', fillcolor='rgba(0, 128, 0, 0.3)', line=dict(color='rgba(0, 0, 0, 0)'), showlegend=False))
+fig.add_trace(go.Scatter(x=x, y=highlighted_region_2, fill='tozeroy', fillcolor='rgba(0, 128, 0, 0.3)', line=dict(color='rgba(0, 0, 0, 0)'), showlegend=False))
+
+fig.update_layout(title="f(x)", showlegend=True, xaxis=dict(showgrid=True), yaxis=dict(showgrid=True))
+
+fig.show()