更有效的字符串到命令方法

Question

我需要一个更有效的方法来完成以下工作：

for character in commandSequence:

    if character == "F":
        i += 1
        gps = move(fullList.iloc[i-1, 2:].values,
                   distance, yaw, pitch, 'forward')

        fullList.loc[i] = ['Forward', 'Actuated', gps[0], gps[1], gps[2]]

    if character == "B":
        i += 1
        gps = move(fullList.iloc[i-1, 2:].values,
                   distance, yaw, pitch, 'backward')

        fullList.loc[i] = ['Backwards', 'Actuated', gps[0], gps[1], gps[2]]

    if character == "+":
        yaw = yaw + radians(yaw)

    if character == '-':
        yaw = yaw - radians(yaw)

    if character == "^":
        pitch = pitch + radians(pitch)

    if character == '.':
        pitch = pitch - radians(pitch)

    if character == '[':
        fullList.iloc[i, 0] = 'Branch'

    if character == ']':
        if fullList['Description'].value_counts()['Branch'] > 0:
            fullList.iloc[i, 0] = 'EOL'
            upsideDown = fullList.reindex(
                index=fullList.index[::-1]).dropna()
            temp = upsideDown.iloc[upsideDown['Description'].eq(
                'Branch').idxmax()].values
            i += 1
            fullList.iloc[i] = temp

典型的commandSequence如下所示：

FF+[+FB-+FB-]-FBFF+[+FB-+FB-+FB-]-FB

我需要优化它，因为它是进化算法的一部分，所以有大量的迭代，这意味着我需要尽可能地加快速度。

此外，如果有人可以提供一些指导，我使用profile (来自profilestats )来计时我的代码，并输出了以下内容：

21233966 function calls (20864585 primitive calls) in 46.433 seconds

   Ordered by: cumulative time
   List reduced from 1994 to 10 due to restriction <10>

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
        1    0.026    0.026   77.205   77.205 attempt_1.2.py:167(main)
        1    0.003    0.003   31.960   31.960 draw.py:1(draw)
        8    0.000    0.000   30.788    3.849 pyplot.py:236(show)
        8    0.000    0.000   30.788    3.849 backend_bases.py:178(show)
        1    0.000    0.000   30.762   30.762 backend_qt5.py:1115(mainloop)
      180    0.406    0.002   27.591    0.153 attempt_1.2.py:32(toCoordinates)
      180    0.284    0.002   17.542    0.097 attempt_1.2.py:104(absorbArea)
27339/19427    0.328    0.000   12.563    0.001 indexing.py:1463(__getitem__)
    12228    0.200    0.000   10.900    0.001 indexing.py:2011(_getitem_tuple)
    25706    0.202    0.000    9.834    0.000 indexing.py:2075(_getitem_axis)

所以，我说得对吗?我需要加速toCoordinates、absorbArea和任何___getitem___调用(不管它们是什么？)

Answer 1

在循环中，您可以向每个if添加“继续”，以避免对所有其他循环进行测试，在这种情况下，循环将转到下一个字符。

    if character == "+":
        yaw = yaw + radians(yaw)
        continue

或使用if / elif

   if condition1:
      some actions

   elif condition2:

诸若此类

我再也看不出要加速你的循环了