linux - 解析行python

Question

   self.filename = d.get('filename', '/var/www/html/data/reading.txt')
    syslog.syslog(syslog.LOG_INFO, "pond: using %s" % self.filename)
    self.bind(weewx.NEW_ARCHIVE_RECORD, self.read_file)

def read_file(self, event):
    try:
        with open(self.filename) as f:
            #value = f.read()
            f.seek(-8, os.SEEK_END)
            line = f.readlines()[-1]
            value = line.split(',')
        syslog.syslog(syslog.LOG_DEBUG, "pond: found value of %s" % value)
        event.record['ccwatt'] = float(value[0])
        event.record['cctemp'] = float(value[1])
    except Exception, e:
        syslog.syslog(syslog.LOG_ERR, "pond: cannot read value: %s" % e)

上面的 python 会读取 txt 文件的最后一行，并添加一条新的存档记录，例如:

123,54

当只有一个值可用于记录时，如何更改它以添加存档记录。显然 split(',') 不会对一个值起作用

123 

Answer 1

一个快速的条件语句应该可以解决这个问题:

            if "," in line:
                value = line.split(',')
            else:
                value = line

添加到您的代码中:

    self.filename = d.get('filename', '/var/www/html/data/reading.txt')
    syslog.syslog(syslog.LOG_INFO, "pond: using %s" % self.filename)
    self.bind(weewx.NEW_ARCHIVE_RECORD, self.read_file)

def read_file(self, event):
    try:
        with open(self.filename) as f:
            #value = f.read()
            f.seek(-8, os.SEEK_END)
            line = f.readlines()[-1]
            if "," in line:
                value = line.split(',')
            else:
                value = line
        syslog.syslog(syslog.LOG_DEBUG, "pond: found value of %s" % value)
        event.record['ccwatt'] = float(value[0])
        event.record['cctemp'] = float(value[1])
    except Exception, e:
        syslog.syslog(syslog.LOG_ERR, "pond: cannot read value: %s" % e)