df1 = pd.read_pickle('df1.pkl')
df2 = pd.read_pickle('df2.pkl')
df3 = pd.read_pickle('df3.pkl')
df4 = pd.read_pickle('df4.pkl')
df5 = pd.read_pickle('df5.pkl')

tmp_1 = pd.merge(df1, df2,  how ='outer', on = ['id','week'])
tmp_2 = pd.merge(tmp_1, df3,  how ='outer', on = ['id','week'])
tmp_3 = pd.merge(tmp_2, df4,  how ='outer', on = ['id','week'])
result_df = pd.merge(tmp_3, df5,  how ='outer', on = ['id','week'])