Python:文件编写仅在Linux上添加无意的换行符

时间:2015-08-13 05:48:33

标签: python linux io newline

我正在使用Python 2.7.9。我正在研究一个程序,它应该在每个循环的.csv文件中产生以下输出:

URL,number

这是我正在使用的代码的主循环:

csvlist = open(listfile,'w')

f = open(list, "r")
def hasQuality(item):
    for quality in qualities:
        if quality in item:
            return True
    return False

for line in f:
    line = line.split('\n')
    line = line[0]
    # print line
    itemname = urllib.unquote(line).decode('utf8')
    # print itemhash

    if hasQuality(itemname):
        try:
        looptime = time.time()
        url = baseUrl + line
            results = json.loads(urlopen(url).read())
            # status = results.status_code
            content = results
            if 'median_price' in content:
                medianstr = str(content['median_price']).replace('$','')
            medianstr = medianstr.replace('.','')
                median = float(medianstr)
                volume = content['volume']
                print url+'\n'+itemname
                print 'Median: $'+medianstr
                print 'Volume: '+str(volume)
                if (median > minprice) and (volume > minvol):
                    csvlist.write(line + ',' + medianstr + '\n')
                    print '+ADDED TO LIST'
            else:
                print 'No median price given for '+itemname+'.\nGiving up on item.'
        print "Finished loop in " + str(round(time.time() - looptime,3)) + " seconds."
    except ValueError:
        print "we blacklisted fool?? cause we skippin beats"
    else:
        print itemname+'is a commodity.\nGiving up on item.'

csvlist.close()
f.close()

print "Finished script in " + str(round(time.time() - runtime, 3)) + " seconds."

应该生成一个如下所示的列表:

AWP%20%7C%20Asiimov%20%28Field-Tested%29,3911 
M4A1-S%20%7C%20Hyper%20Beast%20%28Field-Tested%29,4202

实际生成一个如下所示的列表:

AWP%20%7C%20Asiimov%20%28Field-Tested%29
,3911
M4A1-S%20%7C%20Hyper%20Beast%20%28Field-Tested%29
,4202

每当在Windows机器上运行时,我都没有问题。然而,每当我在我的EC2实例上运行它时,它都会添加额外的换行符。有什么想法吗?在文件上运行命令,如

awk 'NR%2{printf $0" ";next;}1' output.csv

什么都不做。我已将其转移到我的Windows机器上,它仍然会读取相同内容。但是,当我将输出粘贴到Steam的聊天客户端时,它会以我想要的方式连接它。

提前致谢!

1 个答案:

答案 0 :(得分:1)

这是问题发生的地方

<强>码

csvlist.write(line + ',' + medianstr + '\n')

这可以清除你剥离空间

修改后的代码:

csvlist.write(line.strip() + ',' + medianstr + '\n')

<强>问题:

问题是由you are reading raw lines from the input file

引起的

Raw_lines包含\n,表示每一行都有一个新行,它不是最后一行,最后一行是以给定字符结尾。

了解更多详情:

Just type print(repr(line)) before writing and see the output