Question

我尝试将多个具有相同格式的csv文件合并为一个。

merge_list = glob.glob(gndlbsum+"*gndlbsum.csv")
filewriter_lbsum = target_dir+"gndlbsum_master.csv"

#get the list of csv files and set the output file
counter=0
for file in merge_list:
    with open(file,"rU") as csv_file:
        filereader = csv.reader(csv_file)
        with open(filewriter_lbsum,"a") as f:
            writer = csv.writer(f, delimiter = "|")
            #check to see if it's the first file, if it is, add header,
            #otherwise skip first row
            if counter<1:
                for row in filereader:
                    writer.writerow(row)
                    counter+=1
            else:
                header = next(filereader,None)
                for row in filereader:
                    writer.writerow(row)

当我这样做时，输出csv中的每一行都完全用双引号括起来，我尝试使用list.append(row)代替，但它没有区别，因为该行用双引号括起来。有没有办法避免这种情况？

修改

以下是源文件的示例：

COL1|COL2|COL3
1|2|3
4|5|6

输出：

"COL1|COL2|COL3"
"1|2|3"
"4|5|6"

Answer 1

我认为这将消除由于没有告诉正在创建的csv.reader输入文件中的分隔符是"|"个字符而不是默认值{{1}而引起的引号字符。

","

Answer 2

csv模块在每行末尾自动添加双引号。如果不确切知道您的csv文件是什么样的，请尝试以下方法：

merge_list = glob.glob(gndlbsum+"*gndlbsum.csv")
filewriter_lbsum = target_dir+"gndlbsum_master.csv"
#get the list of csv files and set the output file
counter=0
for file in merge_list:
    with open(file,"rU") as csv_file:
        filereader = csv.reader(csv_file, skipinitialspace=True)
        with open(filewriter_lbsum,"a") as f:
            writer = csv.writer(f,delimiter = "|", quoting=csv.QUOTE_NONE)
            #check to see if it's the first file, if it is, add header, 
            #otherwise skip first row
            if counter<1:
                for row in filereader:
                    writer.writerow(row)
                    counter+=1
            else:
                header = next(filereader,None)
                for row in filereader:
                    writer.writerow(row)

csv writer在每行周围放置引号

2 个答案: