如何合并多个文件?

时间:2016-09-04 00:20:02

标签: python python-3.x

我的文件是txt格式,我写了一个简短的代码,将所有三个合并为一个。输入文件是(1)18.8MB,超过16K列,(2)18.8MB,超过16K列,(3)10.5MB,超过7K列。代码有效,但它只合并前两个文件并创建输出文件。不包括第三个输入文件中的数据。这里有什么问题,是否有关于txt文件大小的限制?

filenames = ['/Users/icalic/Desktop/chr_1/out_chr1_firstset.txt', '/Users/icalic/Desktop/chr_1/out_chr1_secondset.txt', '/Users/icalic/Desktop/chr_1/out_chr1_thirdset.txt']
with open('/Users/icalic/Desktop/chr1_allfinal.txt', 'w') as outfile:
    for fname in filenames:
       with open(fname) as infile:
           for line in infile:
               outfile.write(line)

1 个答案:

答案 0 :(得分:2)

只需使用标准库中的fileinput

import fileinput

filenames = [ '...' ]
with open(output_file, 'w') as file_out, fileinput.input(filenames) as file_in:
    file_out.writelines(file_in)

如果您需要更好地控制内存使用或需要处理二进制文件,请使用shutil.copyfileobj

filenames = [ '...' ]
buffer_length = 1024*1024*10 # 10 MB

with open('output_file.txt', 'wb') as out_file:
    for filename in filenames:
        with open(filename, 'rb') as in_file:
            shutil.copyfileobj(in_file, out_file, buffer_length)