Is reuse of a function argument for multiple types in Python 3.4 pythonic, and how does it relate to duck typing? Should I split the function up? -


i come c# , java, lose typing still new me, might show.

i have function shoots of query a database remove duplicates have occurred lately. say, withing last 14 days or so. when script runs daily i'd lookback using integer of days 14; however, might want supply datetime , have use directly instead of calculating date subtraction of integer.

the following pretty have @ moment:

def clean_up_duplicates(dup_lookback):     if hasattr(dup_lookback, 'strftime'):         dup_start_str = dup_lookback.strftime('%y-%m-%d %h:%m:%s')     else:         dup_start = date.today() - timedelta(days=dup_lookback)         dup_start_str = dup_start.strftime('%y-%m-%d %h:%m:%s')      # ... continue on , use dup_start_str in query.

is correct use of ducktyping? pythonic?

my alternative, of top of head, split in 2 functions:

def clean_up_duplicates_since_days(dup_lookback_days):     dup_start_str = dup_lookback.strftime('%y-%m-%d %h:%m:%s')     __clean_up_duplicates(dup_start_str)  def clean_up_duplicates_since_datetime(dup_lookback_datetime):     dup_start = date.today() - timedelta(days=dup_lookback)     dup_start_str = dup_start.strftime('%y-%m-%d %h:%m:%s')     __clean_up_duplicates(dup_start_str)  def __clean_up_duplicates(dup_start_str):     # ... continue on , use dup_start_str in query.

(coded last bit in browser, might off)

duck typing means assume object contains function, , if works.

if there's alternate path take if function doesn't exist, catch try/except.

def clean_up_duplicates(dup_lookback):     try:         dup_start_str = dup_lookback.strftime('%y-%m-%d %h:%m:%s')     except attributeerror:         dup_start = date.today() - timedelta(days=dup_lookback)         dup_start_str = dup_start.strftime('%y-%m-%d %h:%m:%s')

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