Question

I m a python newbie. My script (below) contains a function named "fn_regex_raw_date_string" that is intended to convert a "raw" date string like this: Mon, Oct 31, 2011 at 8:15 PM into a date string like this: _2011-Oct-31_PM_8-15_

Question No. 1: When the "raw" date string contains extraneous characters eg (xxxxxMon, Oct 31, 2011 at 8:15 PMyyyyyy), how should I modify my regular expression routine to exclude the extraneous characters?

  I was tempted to remove my comments from the script below to make it 
     simpler to read, but I thought it might be more helpful for me to leave 
     them in the script.

Question No. 2: I suspect that I should code another function that will replace the "Oct" in "2011-Oct-31_PM_8-15_ " with "11". But I can t help wondering if there is some way to include that functionality in my fn_regex_raw_date_string function.

Any help would be much appreciated.

Thank you, Marceepoo

import sys
import re, pdb
#pdb.set_trace()

def fn_get_datestring_sysarg():
    this_scriptz_FULLName = sys.argv[0]
    try:
        date_string_raw = sys.argv[1]
    #except Exception, e:
    except Exception:
        date_string_raw_error = this_scriptz_FULLName +  :  sys.argv[1] error:  No command line argument supplied 
        print date_string_raw_error
    #returnval = this_scriptz_FULLName +  
  + date_string_raw
    returnval = date_string_raw
    return returnval

def fn_regex_raw_date_string(date_string_raw):
    # Do re replacements
    # p:DataVBPython_MarcsPrgsPython_ItWorksFixCodeFromLegislaturezCalifCode_MikezCode.py
    # see also (fnmatch) p:DataVBPython_MarcsPrgsPython_ItWorksookmarkPDFs.aab.py

    #srchstring = r"(.?+)(Sun|Mon|Tue|Wed|Thu|Fri|Sat)(, )(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)( )([d]{1,2})(, )([d]{4})( at )([d]{1,2})(:)([d]{1,2})( )(A|P)(M)(.?+)"
    srchstring = r"(Sun|Mon|Tue|Wed|Thu|Fri|Sat)(, )(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)( )([d]{1,2})(, )([d]{4})( at )([d]{1,2})(:)([d]{1,2})( )(A|P)(M)"

    srchstring = re.compile(srchstring)    
    replacement = r"_7-3-5_13M_9-11_"
    #replacement = r"_8-4-6_14M_10-12_"    
    regex_raw_date_string = srchstring.sub(replacement, date_string_raw)

    return regex_raw_date_string

    # Mon, Oct 31, 2011 at 8:15 PM  
if __name__ ==  __main__ :
    try:
        this_scriptz_FULLName = sys.argv[0]
        date_string_raw = fn_get_datestring_sysarg()
        date_string_mbh = fn_regex_raw_date_string(date_string_raw)
        print date_string_mbh
    except:
        print  error occurred - fn_get_datestring_sysarg()

Answer 1

或许,你希望用假日标准时间 st子:

rel=“nofollow” http://mail.python.org/pipermail/tutor/2006-March/045729.html。

Answer 2

该法典使用一种固定的表述,取代整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整的整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整整

然后打电话datetime.strptime (date_str,date_format),其中做的是课堂的辛勤工作,并给我们一个datetime。例如:

from datetime import datetime

import calendar
import re

# -------------------------------------

# _months = "|".join(calendar.month_abbr[1:])
_weekdays = "|".join(calendar.day_abbr)

_clean_regex = re.compile(r"""
    ^
    .*?
    (?=""" + _weekdays + """)
    |
    (?<=AM|PM)
    .*?
    $
""", re.X)

# -------------------------------------

def parseRawDateString(raw_date_str):
    try:
        date_str = _clean_regex.sub("", raw_date_str)
        return datetime.strptime(date_str, "%a, %b %d, %Y at %I:%M %p")

    except ValueError as ex:
        print("Error parsing date from  {} !".format(raw_date_str))
        raise ex

# -------------------------------------

if __name__ == "__main__":
    from sys import argv

    s = argv[1] if len(argv) > 1 else "xxxxxMon, Oct 31, 2011 at 8:15 PMyyyyyy"

    print("Raw date:        {} ".format(s))
    d = parseRawDateString(s)
    print("datetime object:")
    print(d)
    print("Formatted date:  {} ".format(d.strftime("%A, %d %B %Y @ %I:%M %p")))

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