Memo on 'week of year'

week_of_year.py

from datetime import datetime
import pandas as pd

# Preparation of a data frame.
date_list = pd.date_range(datetime.now().date(), periods=14)
df = pd.DataFrame(date_list, columns=['DATE'])

day_dict = {'0':'Sun', '1':'Mon', '2':'Tue', '3':'Wed', 
            '4':'Thu', '5':'Fri', '6':'Sat'}
df['DAY'] = df.DATE.dt.strftime('%w')
df['DAY'] = list(map((lambda num: day_dict.get(num)[:1]), list(df.DAY)))


df['pd']  = df.DATE.dt.week
df['ISO'] = [i.isocalendar()[1] for i in df.DATE]
df['%U']  = df.DATE.dt.strftime('%U')
df['%W']  = df.DATE.dt.strftime('%W')

df