How can I parse a time string containing milliseconds in it with python

Question

I am able to parse strings containing date time with time strptime   gt  gt  gt  import time  gt  gt  gt  time strptime  30 03 09 16 31 32     d  m  y  H  M  S    2009  3  30  16  31  32  0  89  -1    How can I parse a time string that contains milliseconds    gt  gt  gt  time strptime  30 03 09 16 31 32 123     d  m  y  H  M  S   Traceback  most recent call last     File   lt stdin gt    line 1  in  lt module gt    File   usr lib python2 5  strptime py   line 333  in strptime     data string found end      ValueError  unconverted data remains   123

User · Answer

To give the code that nstehr s answer refers to  from its source    def timeparse t  format          Parse a time string that might contain fractions of a second       Fractional seconds are supported using a fragile  miserable hack      Given a time string like  02 03 04 234234  and a format string of       H  M  S   time strptime   will raise a ValueError with this     message   unconverted data remains   234234    If  S is in the     format string and the ValueError matches as above  a datetime     object will be created from the part that matches and the     microseconds in the time string              try          return datetime datetime  time strptime t  format  0 6   time       except ValueError  msg          if   S  in format              msg   str msg              mat   re match r unconverted data remains                                    0-9  1 6      msg              if mat is not None                    fractional seconds are present - this is the style                   used by datetime s isoformat   method                 frac         mat group 1                  t   t  -len frac                   t   datetime datetime  time strptime t  format  0 6                   microsecond   int float frac  1e6                  return t replace microsecond microsecond              else                  mat   re match r unconverted data remains                                        0-9  3 3      msg                  if mat is not None                        fractional seconds are present - this is the style                       used by the logging module                     frac         mat group 1                      t   t  -len frac                       t   datetime datetime  time strptime t  format  0 6                       microsecond   int float frac  1e6                      return t replace microsecond microsecond           raise

User · Answer

DNS answer above is actually incorrect  The SO is asking about milliseconds but the answer is for microseconds  Unfortunately  Python s doesn t have a directive for milliseconds  just microseconds  see doc   but you can workaround it by appending three zeros at the end of the string and parsing the string as microseconds  something like   datetime strptime time str    000     d  m  y  H  M  S  f     where time str is formatted like 30 03 09 16 31 32 123   Hope this helps

User · Answer

I know this is an older question but I m still using Python 2 4 3 and I needed to find a better way of converting the string of data to a datetime   The solution if datetime doesn t support  f and without needing a try except is        dt  mSecs    row 5  strip   split           dt   datetime datetime  time strptime dt    Y- m- d  H  M  S   0 6       mSeconds   datetime timedelta microseconds   int mSecs       fullDateTime   dt   mSeconds    This works for the input string  2010-10-06 09 42 52 266000

User · Answer

Python 2 6 added a new strftime strptime macro  f  which does microseconds   Not sure if this is documented anywhere   But if you re using 2 6 or 3 0  you can do this   time strptime  30 03 09 16 31 32 123     d  m  y  H  M  S  f     Edit  I never really work with the time module  so I didn t notice this at first  but it appears that time struct time doesn t actually store milliseconds microseconds   You may be better off using datetime  like this    gt  gt  gt  from datetime import datetime  gt  gt  gt  a   datetime strptime  30 03 09 16 31 32 123     d  m  y  H  M  S  f    gt  gt  gt  a microsecond 123000

User · Answer

My first thought was to try passing it  30 03 09 16 31 32 123   with a period instead of a colon between the seconds and the milliseconds    But that didn t work   A quick glance at the docs indicates that fractional seconds are ignored in any case     Ah  version differences   This was reported as a bug and now in 2 6  you can use   S  f  to parse it

User · Answer

from python mailing lists  parsing millisecond thread   There is a function posted there that seems to get the job done  although as mentioned in the author s comments it is kind of a hack   It uses regular expressions to handle the exception that gets raised  and then does some calculations   You could also try do the regular expressions and calculations up front  before passing it to strptime

User · Answer

For python 2 i did this  print   time strftime   H  M  S   time localtime time time             str time time    split     1  1     it prints time   H  M  S    splits the time time   to two substrings  before and after the    xxxxxxx xx and since  xx are my milliseconds i add the second substring to my   H  M  S   hope that makes sense    Example output      13 31 21 72   Blink 01         13 31 21 81 END OF BLINK 01    13 31 26 3 Blink 01    13 31 26 39 END OF BLINK 01    13 31 34 65 Starting Lane 01

[python] How can I parse a time string containing milliseconds in it with python?

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