tradetime.bardelta

class tradetime.bardelta(date_bars=0, time_bars=0, date_freq=’D’)

用于对bar进行位移计算，并获得两个date和time之间的差。

Parameters

• date_bars: int

  • 交易日期bar，默认为0。

• time_bars: int

  • 交易时间bar，默认为0。

• date_freq: str

  • 交易日期频率，默认为D。

Object Instance

---

>>> tradetime.bardelta()
bardelta(0)

>>> tradetime.bardelta(date_bars=1)
bardelta(date_bars=1, date_freq=D)

>>> tradetime.bardelta(date_bars=1, date_freq='W')
bardelta(date_bars=1, date_freq=W)

>>> tradetime.bardelta(time_bars=10)
bardelta(time_bars=10)

Obejct Attributes

---

>>> bd = tradetime.bardelta(date_bars=1, time_bars=10, date_freq='W')
>>> bd.date_bars
1
>>> bd.time_bars
10
>>> bd.date_freq
'W'

Object Operators

---

• +/- operators

  进行运算的两个bardelta频率必须一致

  >>> tradetime.bardelta(date_bars=1) + tradetime.bardelta(date_bars=2)                
  bardelta(date_bars=3, date_freq=D)
  
  >>> tradetime.bardelta(time_bars=10) - tradetime.bardelta(time_bars=5)  
  bardelta(time_bars=5)
  
  >>> tradetime.bardelta(date_bars=1) + tradetime.bardelta(date_bars=2, date_freq='W')
  
  Traceback (most recent call last):
    ...
  ValueError: D and W inconsistent
  

• comparison operators

  >>> tradetime.bardelta(date_bars=1) < tradetime.bardelta(date_bars=2)
  True
  
  >>> tradetime.bardelta(date_bars=1) < tradetime.bardelta(time_bars=2) 
  False
  
  >>> tradetime.bardelta(date_bars=1) < tradetime.bardelta(date_bars=2, date_freq='W') 
  Traceback (most recent call last):
    ...
  ValueError: D and W inconsistent
  

• bool operators

  >>> bool(tradetime.bardelta()) 
  False
  
  >>> bool(tradetime.bardelta(date_bars=1)) 
  True