I am trying to rotate my secondary y-label to 270 degrees, but when I do this passing the rotate=270 argument it overlaps my y-tick text? I can fix the problem with labelpad but I think this might be a bug, perhaps using pandas?

fig, ax = plt.subplots()

ax.plot(df.index,df.tripTime,label='Fishing Effort', marker='D')
ax2=ax.twinx()
ax2.plot(tr.index,tr.cost, 'g',label='Fuel Expenditure', marker='d')

lines = ax.get_lines() + ax2.get_lines()
ax.legend(lines,[line.get_label() for line in lines], loc='lower left')
ax.set_ylim((0, 18))

ax2.set_ylabel('Cost ($)',color='g', rotation=270)

for tl in ax2.get_yticklabels():
tl.set_color('g')

ax.set_ylabel('Fishing Effort (hrs)')
ax.set_xlabel('Time (days)')
plt.show()