[Py3.5] Export/Import python Objects w/ pickle

/*******************************************************************************************************************
-- Title : [Py3.5] Export/Import python Objects w/ pickle
-- Reference : googling
-- Key word : dump pickle 데이터 덤프 피클 unpickle 언피클 data dump 
*******************************************************************************************************************/

■ Scripts

import pickle
import pandas as pd
 
# --
# -- pickling, dump
# --
# 파이썬 대부분의 객체를 파일로 export/import 할 수 있다.
 
 
########################################
# -- sample objects
########################################
# -- dataframe sample
df = pd.DataFrame({"c1":[1,2,3], "c2":[11,22,33], "c3":[111,222,333]}, index=["i1","i2","i3"])
 
print (df)
print("... sample_dataframe", "." * 100, "\n")
 
# -- -- list sample
lst = [["a", "b", "c"], "g", ["h", "i"]]
 
print (lst)
print("... sample_list", "." * 100, "\n")
 
 
########################################
# -- export dump objects
########################################
 
# -- export dump dataframe
with open('df_sample.dmp', 'wb') as fp:
    pickle.dump(df, fp)
 
# -- export dump list
with open('lst_sample.dmp', 'wb') as fp:
    pickle.dump(lst, fp)
 
 
########################################
# -- import dump files
########################################
 
# -- declare empty objects
imp_df = pd.DataFrame()
imp_lst = []
 
# -- import dump to dataframe
with open ('df_sample.dmp', 'rb') as fp:
    imp_df = pickle.load(fp)
 
print(imp_df)
print("... imported_dataframe", "." * 100, "\n")
 
# -- import dump to list
with open ('lst_sample.dmp', 'rb') as fp:
    imp_lst = pickle.load(fp)
 
print(imp_lst)
print("... imported_list", "." * 100, "\n")