質問編集履歴
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追記
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何卒宜しくお願い致します。
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**追記**
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```Python
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#インポートライブラリ
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import pandas as pd
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import numpy as np
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import scipy as sp
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import matplotlib.pyplot as plt
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import matplotlib as mpl
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import datetime as dt
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import seaborn as sns
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import io
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%precision 3
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cst = pd.read_csv(r'G:\～～～点.csv', engine='python',
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dtype={'cst_id':'object','yymm_entry':'object','PostNo':'object'})
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trn = pd.read_csv(r'G:\_201502_20190602.csv', engine='python',
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dtype={'cst_id':'object','TranLineNo':'object','Store_code':'object'})
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cst.info()
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trn.info()
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cst.drop_duplicates()
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cst = cst.drop(['date_entry_n', 'birthday_n'], axis=1)
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cst.info()
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trn =pd.to_datetime(trn['date_purchase_c'], format='%Y/%m/%d')
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trn.drop_duplicates().head()
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trn_tmp = trn.copy()
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trn_tmp['date_purchase_c']=pd.datetime(trn_tmp['date_purchase_c'],
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format='%Y/%m/%d')
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trn_tmp.info()
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```
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