Solutions added.

Author: WeatherGod

Diff for: solutions/1.1-limits.py

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+fig, ax = plt.subplots(1, 1)
+ax.set_ylim(1000, 500)
+plt.show()

Diff for: solutions/1.2-spines.py

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+fig, ax = plt.subplots(1, 1)
+ax.plot([-2, 2, 3, 4], [-10, 20, 25, 5])
+
+ax.spines['top'].set_position('center')
+ax.spines['right'].set_position('center')
+ax.tick_params(axis='both', direction='inout', length=10)
+
+# Move the two remaining spines "out" away from the plot by 10 points
+ax.spines['bottom'].set_position(('outward', 10))
+ax.spines['left'].set_position(('outward', 10))
+
+plt.show()

Diff for: solutions/2.1-colors.py

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+t = np.arange(0.0, 5.0, 0.2)
+plt.plot(t, t, 'r', t, t**2, 'cyan', t, t**3, '0.7')
+plt.show()

Diff for: solutions/2.2-markers.py

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+t = np.arange(0.0, 5.0, 0.2)
+plt.plot(t, t, "*y", t, t**2, "8m", t, t**3, "sg")
+plt.show()

Diff for: solutions/2.3-properties.py

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+t = np.arange(0.0, 5.0, 0.1)
+a = np.exp(-t) * np.cos(2*np.pi*t)
+plt.plot(t, a, 'r:', marker='D', mfc='y')
+plt.show()

Diff for: solutions/2.4-arrows.py

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+t = np.arange(0.0, 5.0, 0.01)
+s = np.cos(2*np.pi*t)
+plt.plot(t, s, lw=2)
+
+plt.annotate('local min', xy=(2.5, -1), xytext=(3.5, -1.5),
+             arrowprops=dict(arrowstyle='fancy', color='red', shrink=0.5))
+
+plt.ylim(-2, 2)
+plt.show()

Diff for: solutions/3.1-goldstar.py

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+import matplotlib.pyplot as plt
+from matplotlib.collections import StarPolygonCollection
+
+fig, ax = plt.subplots(1, 1)
+
+offsets = zip([0.2, 0.4, 0.6, 0.8], [0.5] * 4)
+collection = StarPolygonCollection(5,
+                                   offsets=offsets,
+                                   transOffset=ax.transData,
+                                   facecolors=['gold'],
+                                   sizes=[75])
+ax.add_collection(collection)
+plt.show()