100 examples of python --- take out the text of the specified time period

Many files like logs have a time field. Sometimes, we want to retrieve data for a certain period of time. For example this file:

[root@www py2]# cat mylog.log 
2019-05-15 08:10:01 aaaa
2019-05-15 08:32:00 bbbb
2019-05-15 09:01:02 cccc
2019-05-15 09:28:23 dddd
2019-05-15 10:42:58 eeee
2019-05-15 11:08:00 ffff
2019-05-15 12:35:03 gggg
2019-05-15 13:13:24 hhhh

We want to get the data between 9:00 and 12:00. Observe the file and find that its characteristic is that the first 19 characters are time, as long as this part of the data is converted into the corresponding time object, and it is judged whether it is between 9:00 and 12:00:

## Using the time module

Import Time 
logfile = ' mylog.log ' 
# Each line fetch log file, determination time, if it is between 9:00 to 12:00, the print 
T9 = the time.strptime ( ' 2019-05-15 09:00: 00 ' , ' % Y-% m-% d% H:% M:% S ' ) 
t12 = time.strptime ( ' 2019-05-15 12:00:00 ' , ' % Y-% m-% d % H:% M:% S ' ) 
with open (logfile, ' r ' ) as fobj:
     for line in fobj: 
        t = time.strptime (line [: 19], ' % Y-% m-% d% H :% M:% S' )
         IF T> T12:      # , when time is greater than the maximum time directly, directly exit the program executed faster 
            BREAK 
        IF T> T9:
             Print (Line, End = ' ' )

## Use datetime module

from datetime import datetime
​
logfile = 'mylog.log'
start = datetime.strptime('2019-05-15 09:00:00', '%Y-%m-%d %H:%M:%S')
end = datetime.strptime('2019-05-15 12:00:00', '%Y-%m-%d %H:%M:%S')
​
with open(logfile,'r') as fobj:
    for line in fobj:
        t = datetime.strptime(line[:19], '%Y-%m-%d %H:%M:%S')
        if t > end:
            break
        if t > start:
            print(line,end='')