how to change plot size in matplotlib

import matplotlib.pyplot as plt

plt.figure(figsize=(14,7)) 
plt.bar(x,y) 

# if you have plotted you graph directly using dataframe like this ↓
data.plot(kind='bar')

# then use this
plt.rcParams["figure.figsize"] = (14,7)

import matplotlib.pyplot as plt
plt.rcParams["figure.figsize"] = (20,3)

# Import Library

import matplotlib.pyplot as plt

# Increase size of plot in jupyter

plt.rcParams["figure.figsize"] = (8,5.5)

# Define Data

x = [2, 4, 6, 8]
y = [5, 10, 15, 20]

# Plot

plt.plot(x, y, '-.')

# Display

plt.show()

fig_width, fig_height = plt.gcf().get_size_inches()
print(fig_width, fig_height)