average, std 그리기

# total_len = np.array(total_len)

# mean = total_len.mean()

# std_error = np.std(total_len, ddof=1) / np.sqrt(len(total_len))

# #define chart

# fig, ax = plt.subplots()

# #create chart

# ax.bar(x=np.arange(1), #x-coordinates of bars

#        height=mean, #height of bars

#        yerr=std_error, #error bar width

#        capsize=4) #length of error bar caps

# fig.savefig('averaged_num.jpg')