4
我有過去50年每個工作日的股票價格數據,包括日期/時間戳。在每個月的月底,我需要計算直到年底的剩餘天數。由於解決方案必須使用時間戳,所以必須考慮閏年。我嘗試這樣做的代碼:計算時間直到年底python
from datetime import datetime
t = df.index
dfa =(datetime(t.year, 12, 31) -t)/(datetime(t.year, 12, 31)-datetime(t.year, 1, 1))
然而,它返回類型錯誤:
only length-1 arrays can be converted to Python scalars
我也嘗試這樣的:
i=0
df["time_value"] = 0
while i<len(df):
t = df.index[i]
time_value=(datetime(t.year, 12, 31) -t)/(datetime(t.year, 12, 31)-datetime(t.year, 1, 1))
df.time_value[i] = time_value
i+1
這是所使用的數據幀的短的例如:
CLOSE_SPX Close_iBoxx A_Returns B_Returns A_Vola B_Vola
2014-05-15 1870.85 234.3017 -0.009362 0.003412 0.170535 0.075468
2014-05-16 1877.86 234.0216 0.003747 -0.001195 0.170153 0.075378
2014-05-19 1885.08 233.7717 0.003845 -0.001068 0.170059 0.075384
2014-05-20 1872.83 234.2596 -0.006498 0.002087 0.170135 0.075410
2014-05-21 1888.03 233.9101 0.008116 -0.001492 0.169560 0.075326
2014-05-22 1892.49 233.5429 0.002362 -0.001570 0.169370 0.075341
2014-05-23 1900.53 233.8605 0.004248 0.001360 0.168716 0.075333
2014-05-27 1911.91 234.0368 0.005988 0.000754 0.168797 0.075294
2014-05-28 1909.78 235.4454 -0.001114 0.006019 0.168805 0.075474
2014-05-29 1920.03 235.1813 0.005367 -0.001122 0.168866 0.075451
2014-05-30 1923.57 235.2161 0.001844 0.000148 0.168844 0.075430
2014-06-02 1924.97 233.8868 0.000728 -0.005651 0.168528 0.075641
2014-06-03 1924.24 232.9049 -0.000379 -0.004198 0.167852 0.075267
看看http://stackoverflow.com/questions/1580227/find-time-until-a-date-in-python。事實上,這很接近重複。 – Scott
感謝您的建議,那麼您將如何做? –
'CLOSE_SPX' a ['DatetimeIndex'](http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DatetimeIndex.html)? – MattDMo