ZOOMEDINSET1.py

# loc values
# 2---8---1
# |   |   |
# 6---10--5/7
# |   |   |
# 3---9---4

axins1 = zoomed_inset_axes(ax, zoom = 5, loc=2)
axins1.plot(y,datapts.T)
axins1.plot(y,datapts.T,'mo')

# SPECIFY THE LIMITS
x1, x2, y1, y2 = 24,26,54.5,56 
axins1.set_xlim(x1, x2)
axins1.set_ylim(y1, y2)

# FOR ANNOTATING THE 3 POINTS WE ARE ZOOMING ON
for dpt,ypt in zip(datapts.T[3],[25]*4):
    if dpt > y1 and dpt < y2:
        axins1.annotate("%.2f"%(dpt),xy=(ypt,dpt),textcoords='data')
        
# IF SET TO TRUE, TICKS ALONG 
# THE TWO AXIS WILL BE VISIBLE
plt.xticks(visible=False)
plt.yticks(visible=False)

mark_inset(ax, axins1, loc1=1, loc2=4, fc="none", ec="0.5")