In [4]:

    

import datetime as dt


    

In [20]:

    

dt.datetime.strptime('2010121', '%Y%j')

# print(dt.datetime.strptime('2010 120', '%Y %j').strftime())
# datetime.datetime(2010, 4, 30, 0, 0)
# >>> _.strftime('%d/%m/%Y')
# '30/04/2010'


    

    
Out[20]:





datetime.datetime(2010, 5, 1, 0, 0)

In [16]:

    

mmdd_str[2:4]


    

    
Out[16]:





'01'

In [22]:

    

"%03d" % 1


    

    
Out[22]:





'001'

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