質問編集履歴
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コードをすべて書きました。逆にわかりづらくなっていたら申し訳ないです。「#期間を出す」の部分の処理で警告が出ている状況です。
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```Python3
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import numpy as np
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import pandas as pd
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import matplotlib.pyplot as plt
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%matplotlib inline
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cs_master = pd.read_csv("customer_master.csv")
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class_master = pd.read_csv("class_master.csv")
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cs_master.head()
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class_master.head()
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#文字列から日付へ変換
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cs_master["start_date"] = pd.to_datetime(cs_master["start_date"])
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cs_master["end_date"] = pd.to_datetime(cs_master["end_date"])
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cs_master["start_ym"] = cs_master["start_date"].dt.strftime("%Y%m")
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cs_master["end_ym"] = cs_master["end_date"].dt.strftime("%Y%m")
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#結合
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cs_join = pd.merge(cs_master, class_master, on="class", how="left")
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cs_join.head()
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#期間を出す
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from dateutil.relativedelta import relativedelta
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cs_join["calc_date"] = cs_join["end_date"]
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@@ -68,7 +112,23 @@
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```
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```cs_join.head()
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customer_id name class gender start_date end_date campaign_id is_deleted start_ym end_ym class_name price
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0 OA832399 XXXX C01 F 2015-05-01 NaT CA1 0 201505 NaN オールタイム 10500
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1 PL270116 XXXXX C01 M 2015-05-01 NaT CA1 0 201505 NaN オールタイム 10500
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2 OA974876 XXXXX C01 M 2015-05-01 NaT CA1 0 201505 NaN オールタイム 10500
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3 HD024127 XXXXX C01 F 2015-05-01 NaT CA1 0 201505 NaN オールタイム 10500
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4 HD661448 XXXXX C03 F 2015-05-01 NaT CA1 0 201505 NaN ナイト 6000
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```
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```
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```cs_join[["start_date", "end_date", "calc_date", "member_period"]].head()
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start_date end_date calc_date member_period
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