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我正在使用 python 2.6。谁能弄清楚为什么我的变量 squared 在 min() 函数中时不能正确计算？为了说明，我展示了自己执行的变量**2，工作正常。这是代码，然后是一些结果：

from __future__ import with_statement
import csv, re, time
timestr = time.strftime("%Y%m%d_%H%M%S")

fileinput = 'mp_20130822.csv'
out = open('output2.csv',"wb")
writer = csv.writer(out, delimiter = ',')

ESPmax = 100.00
dynmax = "enabled"

def config():
    global argument
    if z>30:
        argument = "T"
    else:
        argument = "F"

with open(fileinput,'rU') as inputfile:
    reader = csv.reader(inputfile, delimiter = ';')
    for line in reader:
            line = re.split(",| ",line[0])
            side = str(line[4]) #is "Bid" or "Ask"
            e = float(line[5])
            z = float(line[6])
            t = float(line[33])
            FW = float(line[34])
            FS = max(float(line[35]),200)
            if FW == 0:
                continue
            if (FS == 0) or (FS == 1):
                continue
            if side == "Ask":
                LE = t-e
            else:
                LE = e-t
            LEP = LE/(FW/2)
            ESP = z/(FS/2)
            if dynmax == "enabled":
                ESPmax = min(LEP**2,ESPmax)

    config()
    if (argument == "T"):
        print ('side, e, z, t, FW, FS')
        print ('LEP,LEP,ESPmax')
        print (side, '%.2f'%e, '%.2f'%z, '%.2f'%t, '%.2f'%FW, '%.2f'%FS)
        print ('%.3f'%LEP,'%.3f'%LEP,'%.5f'%ESPmax)
        print '%.5f'%(LEP*LEP)

结果：

side, e, z, t, FW, FS
LEP,LEP,ESPmax
('Ask', '1.90', '50.00', '1.95', '0.24', '651.00')
('0.423', '0.423', '0.00130')
0.17880
side, e, z, t, FW, FS
LEP,LEP,ESPmax
('Ask', '8.40', '40.00', '8.43', '0.17', '4933.00')
('0.348', '0.348', '0.00130')
0.12145
side, e, z, t, FW, FS
LEP,LEP,ESPmax
('Ask', '8.40', '40.00', '8.43', '0.17', '4919.00')
('0.370', '0.370', '0.00130')
0.13667
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1 回答 1

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缩进显然是 Python 中的 SyntaxError，因此不清楚您的代码实际做了什么。虽然我很确定你以某种方式设法分配0.00130给ESPmax，一旦你到达那里

ESPmax = min(LEP**2,ESPmax)

行不会ESPmax因您的值而改变LEP。

于 2013-08-22T20:36:05.463 回答