a.txt
2019-08-03 14:28:41 99999
2019-08-03 14:28:41 888
2019-08-03 14:28:41 77771111111
with open('a.txt', 'r',encoding='utf-8') as f:
print(max(len(line)for line in f))
C:\Users\user\AppData\Local\Programs\Python\Python36\python.exe “C:/Users/user/PycharmProjects/hellow python/test.py”
32
Process finished with exit code 0