Bottom border on matplotlib bar plot

So I'm trying to make a bar plot in using matplotlib, without the "box" or axis ticks, as follows:

import matplotlib.pyplot as plt

fig, ax = plt.subplots()
ax.bar([1, 2], [150, 250], edgecolor = 'black', linewidth = 1, \
       color = '#EEFFCC')

ax.set_xticks([1, 2])
plt.tick_params(bottom = False, left = False)
ax.spines['top'].set_visible(False)
ax.spines['right'].set_visible(False)
ax.spines['left'].set_visible(False)
ax.spines['bottom'].set_visible(False)

Particularly, I don't want the "box" but I want the bars to have a black border. However, when I make the plot, it looks like this:

And the bottom border isn't there (ostensibly since I got rid of the bottom "box" spine). If I try to set linewidth = 2 or higher, the border is there but is a lot thinner than the top, left, or right borders.

Is there anyway that I can have the bottom border display at the same length as the top/left/right borders for the bar? Thanks!