today 조회, 날짜 계산
import datetime
today_1 = datetime.datetime.today()
print( today_1 )
# 2025-04-07 11:26:42.904529
today_2 = datetime.date.today()
print( today_2 )
# 2025-04-07
today_3 = pd.to_datetime(today_2)
print( today_3 )
# 2025-04-07 00:00:00
yester_day_1 = today_3 + pd.to_timedelta(-1, unit="D")
print( yester_day_1 )
# 2025-04-06 00:00:00
연속 날짜 데이터 프레임 만들기
import pandas as pd
temp_df_1 = pd.DataFrame([1,2,3], index=["2025-04-01", "2025-04-02", "2025-04-03"], columns=["A"])
temp_df_1.index = pd.to_datetime(temp_df_1.index)
print(temp_df_1)
# A
# 2025-04-01 1
# 2025-04-02 2
# 2025-04-03 3
temp_df_2 = pd.DataFrame(temp_df_1, index=pd.date_range(temp_df_1.index.min(), "2025-04-05", freq="D"))
print(temp_df_2)
# A
# 2025-04-01 1.0
# 2025-04-02 2.0
# 2025-04-03 3.0
# 2025-04-04 NaN
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