[Python] How to reduce horizontal padding in this matplotlib plot?

I'm trying to eliminate horizontal padding of a Matplotlib plot. Here is the script:

import numpy as np, matplotlib.pyplot as plt

a = np.random.rand(100)
plt.figure(figsize=(12, 6), dpi=100)
plt.tight_layout()
plt.plot(a)
plt.show()


The result contains a lot of horizontal padding:



I tried this alternative, but the result was the same:

import numpy as np, matplotlib.pyplot as plt

a = np.random.rand(100)
fig, ax = plt.subplots()
fig.set_dpi(100)
fig.set_size_inches(12, 6)
ax.autoscale_view('tight')
ax.plot(a)
plt.show()


Is there a simple solution to this problem?

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