新手请教python程序返回值的问题

ganhy

麻烦各位大侠帮看看这个程序的返回值为啥不是零？？？谢谢！

#! /usr/bin/python

import re
import os
import sys
import gzip

def rmN(Args):
        if not Args:
                print 'Usage: rmN <in.fq> <max_N_ratio><outfile>'
                print 'Max_N_ratio [float] , e.g. 0.05'
                sys.exit(0)
        if re.search('gz$|gzip$', Args[0]):
                infile = gzip.open(Args[0], 'rb')
        else:
                infile = open(Args[0], 'r')
        maxN = float(Args[1])
        outfile = Args[-1]
        #fqname = os.path.basename(Args[0]).replace('.gz', '')
        #fqname = fqname.replace(fqname.split('.')[-1], 'fq')
        remain = open(outfile, 'w')
        #remove = open(Args[-1] + '/removed_N_' + fqname, 'w')
        #remove_log  = open(outfile + '.log', 'w')
        remove_reads = 0
        total_reads = 0
        while True:
                readid = infile.readline().rstrip()
                if len(readid) == 0:
                        break
                seq = infile.readline().rstrip()
                mark = infile.readline().rstrip()
                qual = infile.readline().rstrip()
                seqlen = len(seq)
                total_reads += 1
                N_count = seq.count('N')
                N_ratio = float(N_count) / seqlen
                if N_ratio <= maxN:
                        remain.write('%s\n%s\n%s\n%s\n' %(readid, seq, mark, qual))
#            remain.write('%s\n%s\n%s\n%s\n' %(readid, seq, mark, qual))
                else:
                        remove_reads += 1
        remove_rate = float(remove_reads) / total_reads * 100
        sys.stdout.write('Total Reads\tRemoved N Reads\t%Removed N Rate\n')
        sys.stdout.write('%s\t%s\t%.2f\n' %(total_reads, total_reads - remove_reads, remove_rate))
    #remove_log.write('Total Reads\tRemoved N Reads\t%Removed N Rate\n')
        #remove_log.write('%s\t%s\t%.2f\n' %(total_reads, total_reads - remove_reads, remove_rate))
        infile.close()
        remain.close()


if __name__ == '__main__':
        if len(sys.argv) > 1:
                rmN(sys.argv[1:])
        #sys.exit(0)
        else:
                print 'Usage: rmN <in.fq> <max_N_ratio><outfile>'
                print 'Max_N_ratio [float] , e.g. 0.05'
                sys.exit(0)

wenhq

什么的返回值？return

ganhy

def run_cmd(cmd_str):
    """
   Throw exception if run command fails
    """
    #process = subprocess.Popen(cmd_str, stdout = subprocess.PIPE,stderr = subprocess.PIPE, shell = True)
  process = subprocess.Popen(cmd_str, stdout = subprocess.PIPE,stderr = subprocess.STDOUT, shell = True)
    stdout_str, stderr_str = process.communicate()
    if process.returncode != 0:
  raise Exception("Failed to run '%s'\n%s%sNon-zero exit status %s" %(cmd_str, stdout_str, stderr_str, process.retu
    rncode))

我定义了这样一个子函数，用来运行上面那个程序总是会报错Non-zero exit status 126

代号：军刀

回复 3# ganhy


    不可以这样赋值

1. stdout_str, stderr_str = process.communicate()

复制代码

process.communicate()返回的是一个数组

ganhy

回复 4# 代号：军刀


    我运行其他的函数时都没有报这种错啊

ganhy

回复 4# 代号：军刀


    我运行其他的函数时都没有报这种错啊