python - Python：将分隔符设置为逗号和空格'，'

Question

我想在我的 CSV 文件中附加一个新行但是新行必须用逗号分隔，并且它们之间有空格。我只能用逗号或空格分隔它们。

当前文件是：

数据.csv

1,abc1,xyz1
2,abc2,xyz2
3,abc3,xyz3
4,abc4,xyz4
5,abc5,xyz5

我想要它：

数据.csv

1, abc1, xyz1
2, abc2, xyz2
3, abc3, xyz3
4, abc4, xyz4
5, abc5, xyz5

我编写 CSV 的代码：

my_new_row = [6, 'abc6', 'xyz6']
with open('data.csv', 'a', newline='') as filehandle:
    writer = csv.writer(filehandle, delimiter=',')
    writer.writerow(my_new_row)

Answer 1

您要打印的格式似乎不是标准的 CSV 格式。因此，您可以编写自己的编写器来打印该字符串格式。

逗号分隔值 (CSV) 文件的通用格式和 MIME 类型

Answer 2

这当然不是很有效，但它确实解决了您的问题，只有新行在分隔符后包含空格。

import csv

my_new_row = [6, 'abc6', 'xyz6']
x, y = ',', ', '

with open('data.csv', 'r', newline='') as original_file:
    original_reader = csv.reader(original_file)
    with open('new_file.csv', 'w', newline='') as new_file:
        new_writer = csv.writer(new_file, delimiter=',')
        for line in original_reader:
            new_writer.writerow(line)
        with open('temp_file.csv', 'w+', newline='') as temp_file:
            temp_reader = csv.reader(temp_file)
            temp_writer = csv.writer(temp_file, delimiter=',')
            temp_writer.writerow(my_new_row)
            temp_file.seek(0)
            data = temp_file.read()
            temp_file.seek(0)
            temp_file.write(data.replace(x, y))
            temp_file.seek(0)
            for line in temp_reader:
                new_writer.writerow(line)

输出全部写入 new_file.csv

Answer 3

AS CVS 文件格式意味着“，”逗号分隔值，我假设您现在不再需要 CSV 输出文件，而是一个简单的文本输出文件。

下面的代码会产生你想要的输出

def readAndWriteFile(read_file_path,write_file_path):
    with open(read_file_path,"r") as fin:
        output = [", ".join(element.split(',')) for element in fin.readlines()]
    print("output:",output)
    
    with open(write_file_path,'w') as fout:
        fout.writelines(output)

Answer 4

这是一个简单的解决方法：

import csv

class CSV_Translater(object):
    """ Output file-like object that translates characters. """
    def __init__(self, f, old, new):
        self.f = f
        self.old = old
        self.new = new
    def write(self, s):
        self.f.write(s.replace(self.old, self.new))
    def close(self):
        self.f.close()
    def flush(self):
        self.f.flush()

my_new_row = ['6', 'abc6', 'xyz6']


with open('data.csv', "r+") as filehandle:
    reader = csv.reader(filehandle)
    with open('out_test.csv', "w") as opfile:
        translater = CSV_Translater(opfile, ',', ', ')
        writer = csv.writer(translater, delimiter=',')
        for row in reader:
            writer.writerow(row)
        writer.writerow(my_new_row)

1

Answer 5

不是最好的解决方案，但根据您的要求，我能想到的一种解决方案是

import csv
my_new_row = [6, 'abc6', 'xyz6']
with open('data.csv', 'a') as filehandle:
    writer = csv.writer(filehandle, delimiter=',')
    writer.writerow([' ' + str(i) if isinstance(i, str) else i for i in my_new_row])

输出/输出： 6, abc6, xyz6

试试这个，让我知道这是否有帮助。