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Help is needed forpython code

Hello,

I am beginner in python. I am trying to draw districution curve using one column (total_time) from my csv file. I am getting error on line 13 in this code. Any help will be highly appreciated.

import csv

from sortedcontainers import SortedDict
import matplotlib.pyplot as plt
import numpy as np
import scipy.stats as stats
import matplotlib.pyplot as plt
d = {}
with open(‘C:\Users\dreamzz\myfile.csv’, ‘rb’) as csvfile:
reader = csv.DictReader(csvfile)
for col in reader:
field = col[‘Total_time’]
for i in field:
if d[1]== ’ ’ :

            d[1]=i
        else:
            d[1]=i+1


s = SortedDict(d)



hmean = np.mean(s)
hstd = np.std(s)
pdf = stats.norm.pdf(s, hmean, hstd)
plt.plot(s, pdf)