Утилита или однострочник для подсчёта задержек между событиями в логах

import datetime                                                                                                                                                                                                                                                                                                                                                                                                      
                                                                                                                                                                                                            
def from_string(string):                                                                                                                                                                                                                                                                                                                              
    parts = string.split(".")                                                                                                                                                                               
    date_time = parts[0]                                                                                                                                                                                    
    uss = parts[1]                                                                                                                                                                                          
    stamp = datetime.datetime.strptime(date_time, "%Y%m%d-%H:%M:%S")                                                                                                                                        
    stamp += datetime.timedelta(microseconds=int(uss))                                                                                                                                                      
    return stamp                                                                                                                                                                                            
                                                                                                                                                                                                            
def delta_us(lesser, greater):                                                                                                                                                                              
    delta = greater - lesser                                                                                                                                                                                
    return delta.microseconds                                                                                                                                                                               
                                                                                                                                                                                                            
def deltas(stamps, pair=False):                                                                                                                                                                             
    lhs = None                                                                                                                                                                                              
    for s in stamps:                                                                                                                                                                                        
        if lhs is None:                                                                                                                                                                                     
            lhs = s                                                                                                                                                                                         
            continue                                                                                                                                                                                        
                                                                                                                                                                                                            
        delta = delta_us(lhs, s)                                                                                                                                                                            
        yield delta                                                                                                                                                                                         
        if pair:                                                                                                                                                                                            
            lhs = None                                                                                                                                                                                      
        else:                                                                                                                                                                                               
            lhs = s                                                                                                                                                                                         
                                                                                                                                                                                                            
                                                                                                                                                                                                            
if __name__ == "__main__":                                                                                                                                                                                  
    import argparse                                                                                                                                                                                         
    import sys                                                                                                                                                                                              
    parser = argparse.ArgumentParser(description='Converts list of timestamps'                                                                                                                              
                                    ' to delays in us')                                                                                                                                                     
    parser.add_argument('--pair', '-p', action='store_true',                                                                                                                                                
                    help='Group stamps by pair')                                                                                                                                                            
    args = parser.parse_args()                                                                                                                                                                              
                                                                                                                                                                                                            
    stamps = []                                                                                                                                                                                             
                                                                                                                                                                                                            
    for l in sys.stdin:                                                                                                                                                                                     
        stamps.append(from_string(l))                                                                                                                                                                       
                                                                                                                                                                                                            
    for d in deltas(stamps, args.pair):                                                                                                                                                                     
        print (d)