make plot transparent matplotlib code example

Example 1: python change plot transparency

# Basic syntax:
plt.plot(data, alpha=0.5)

# Note, the alpha parameter goes from 0 (fully transparent) to 1 
# 	(fully solid). It is especially useful when plotting overlapping
# 	histograms.

Example 2: transparancy argument pyplot

df[df["column_1"] == "example_1"]["column_2"].hist(alpha=0.5)