我正在读取一个.csv文件并创建一个pandas dataframe,该文件是股票文件。我只关心日期、公司和收盘价。我想让我的程序找到指定公司在指定日期范围内的最大利润,需要使用分而治之算法。我只会用for循环,但它运行时间太长了。.csv文件有20万行,请问如何加速程序运行?
import pandas as pd
import numpy as np
import math
def cleanData(file):
df = pd.read_csv(file)
del df['open']
del df['low']
del df['high']
del df['volume']
return np.array(df)
df = cleanData('prices-split-adjusted.csv')
bestStock = [None, None, None, float(-math.inf)]
def DAC(data):
global bestStock
if len(data) > 1:
mid = len(data)//2
left = data[:mid]
right = data[mid:]
DAC(left)
DAC(right)
for i in range(len(data)):
for j in range(i+1,len(data)):
if data[i,1] == data[j,1]:
profit = data[j,2] - data[i,2]
if profit > bestStock[3]:
bestStock[0] = data[i,0]
bestStock[1] = data[j,0]
bestStock[2] = data[i,1]
bestStock[3] = profit
print(bestStock)
print('\n')
return bestStock
print(DAC(df))