Work Program 2 for Topcon

import matplotlib.pyplot as plt

SNR = {}
file = open('SNR.txt', 'r')
for line in file:
    s = line.split()
    if len(s) > 1 and s[8] != "0.0":
        num = s[4]
        dot_time = s[8]
        time = float(dot_time)
        if num not in SNR.keys():
            SNR[num] = [time]
        elif num in SNR.keys():
            SNR[num].append(time)
sorted_SNR = {key: SNR[key] for key in sorted(SNR)}

print('Введите SNR для демонстрации: ' + ', '.join(sorted_SNR.keys()) + '\n')
num_of_snr = input()
times = sorted_SNR[num_of_snr]
dict_of_times = {key: 0 for key in set(times)}
counts = []
for key in dict_of_times:
    dict_of_times[key] = times.count(key)
    counts.append(dict_of_times[key])

plt.bar(dict_of_times.keys(), counts, width=0.6)
plt.xlabel('Время')
plt.ylabel('Кол-во повторений')
#plt.show()
plt.title('SNR%s' % num_of_snr)
plt.savefig('SNR%s.png' % num_of_snr)
plt.show()