Matplotlib plt Hist() parameter explanation

import matplotlib as mpl
import matplotlib.pyplot as plt
from matplotlib.pyplot import MultipleLocator
from matplotlib import ticker
%matplotlib inline


plt.figure(figsize=(8,5), dpi=80)
#  Take parameters to receive hist Return value , It is mainly used to record the returned value of the group , Tag data labels 
n, bins, patches = plt.hist(data13['carrier_no'], bins=11, rwidth=0.8, range=(1,12), align='left', label='xx Histogram ')
for i in range(len(n)):
    plt.text(bins[i], n[i]*1.02, int(n[i]), fontsize=12, horizontalalignment="center") # tagging , Mark the number of samples on each histogram in an appropriate position 
plt.ylim(0,16000)
plt.title(' Histogram ')
plt.legend()
# plt.savefig(' Histogram '+'.png')
plt.show()