我有一个Python(3)程序,它从文件中读入一些数据,获取相关部分并将其输出到其他地方。问题是file.readline()
已经开始拒绝从任何文件中获取任何行。它只是返回一个空字符串,就好像它在文件末尾一样。文件没有问题,我用一个快速脚本检查过了(读取文件,逐行打印)。可能的解决方案(尽管我不知道为什么)是我使用2to3将代码转换为python3,但是看看它打印的差异,我没有看到对文件I/O的任何修改。在
程序如下:
import threading
import time
def runFile(eventFile, channelRefFileName, serialPorts, timeScale, maxPEs):
timer0 = threading.Timer(.0001, turnOffLED, [0, 0, 0, 1])
numEvents = getNumEvents(eventFile)
eventCount = 0
while 1:
linein = eventFile.readline()
#if linein == '' or '\n' or '\r\n' or '\r': break
#above checks if the end of file has been reached, below is debugging
if linein == '': print('EOF')
if linein == '\n': print('linefeed')
if linein == '\r\n': print('carrige return/ linefeed')
if linein == '\r' : print('carrige return')
if linein == 'New Event\n':
print('New Event', eventCount, ': file is',
(eventCount/numEvents)*100, '% done.')
eventCount += 1
#insert event sleep time here
continue
linein = linein.split(' ')
del(linein[::2])
linein[2] = linein[2][:-1]
linein[1] = float(linein[1])
if linein[1] < 0: linein[1] = linein[1] * (-1)
channel = channelLookup(linein[0], channelRefFileName)
#serialPorts[channel[0]].write(str(channel[1],linein[2]))
if timer0.isAlive:
#use backup timer
timer1 = threading.Timer(0.005, turnOffLED, [serialPorts, channel[0], channel[1], 0])
timer1.start()
else:
#use primary timer
timer0 = threading.Timer(0.005, turnOffLED, [serialPorts, channel[0], channel[1], 0])
timer0.start()
print('Sleeping:', linein[1]*timeScale)
time.sleep(linein[1]*timeScale)
def channelLookup(channel, channelRefFile):
channelRef = open(channelRefFile, 'r')
for line in channelRef:
if channel in line:
linein = line
break
linein = linein.split('-')
channelRef.close()
return linein[1:]
def turnOffLED(serialPorts, arduino, pmt, bs):
if bs: return -1
#serialPorts[arduino].write(str(pmt,0))
def getNumEvents(eventFile):
i = 0
for lines in eventFile:
if lines == 'New Event\n':
i += 1
return i
以上内容由:
^{pr2}$下面是程序可能处理的一些示例数据(一个文件可能大约有500000行):
Channel: 447 Time: 121.263 PEs: 2263.38
Channel: 445 Time: 118.556 PEs: 1176.54
Channel: 448 Time: 120.384 PEs: 1159.59
Channel: 446 Time: 122.798 PEs: 983.949
Channel: 499 Time: 129.983 PEs: 762.07
getNumEvents
会消耗整个文件,因此当您四处阅读时,它的指针已经在末尾。相反,请使用^{相关问题 更多 >
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