def _get_boot_time():
f = open('<STR_LIT>', '<STR_LIT:r>')<EOL>try:<EOL><INDENT>for line in f:<EOL><INDENT>if line.startswith('<STR_LIT>'):<EOL><INDENT>return float(line.strip().split()[<NUM_LIT:1>])<EOL><DEDENT><DEDENT>raise RuntimeError("<STR_LIT>")<EOL><DEDENT>finally:<EOL><INDENT>f.close()<EOL><DEDENT>
Return system boot time (epoch in seconds)