Python：将时间格式转换为十进制

Question

如何在Python中将HH：MM：SS.SSS格式的时间转换为十进制数？示例：我想将时间“ 00：00：26.94”转换为十进制数字，以便可以将十进制数字用作绘制图表的数据。

Answer 1

您可以将plt.plot_date()与mdates.date2num()结合使用。

import datetime as dt
import matplotlib.pyplot as plt 
import matplotlib.dates as mdates 

d = dt.datetime.strptime("00:00:26.94","%H:%M:%S.%f")
plt.plot_date(mdates.date2num(d),1)
plt.gca().set_xlim((dt.datetime.strptime("00:00:25","%H:%M:%S"),
                    dt.datetime.strptime("00:00:27","%H:%M:%S")))
plt.show() 

示例图：

Answer 2

time = "21:14:05.00"    # Hours, minutes, seconds and hundreds of seconds
(h,m,s) = time.split(':')   # Get hours, minutes and seconds

hours   = float(h)
minutes = float(m)

# Divide the seconds from the hundreds of seconds, and assign in a []
a = s.split('.')
seconds = float(a[0])
hundreds = float(a[1])
decimalt = hours*3600.0 + minutes*60.0 + seconds + hundreds/100.0
print(time)
print (decimalt)