the plot is s=too small in python code example

Example 1: increase figure size in matplotlib

plt.figure(figsize=(20,10))

Example 2: python marker size

>>> plot(x, y, 'go--', linewidth=2, markersize=12)
>>> plot(x, y, color='green', marker='o', linestyle='dashed',
...      linewidth=2, markersize=12)

Example 3: change plot size matplotlib python

plt.figure(figsize=(14,7))