我试图编写脚本以从ftp服务器访问.csv.gz文件,并将内容写回到同一服务器上的.csv文件。只要文件小于100mb,此方法似乎就可以正常工作,否则它将失败,从而导致内存错误。我无法找到一种方法来提取.csv文件,因此它逐行读取文件内容(元组列表)并将其写入新文件。
是否有更有效的方法,甚至是直接从.csv.gz文件中提取.csv文件的方法?
def gz_unzipper():
hostname = "servername"
directory = "path"
input_file = directory + "filename.csv.gz"
output_file = directory + "filename.csv"
ftp = FTP(hostname)
ftp.login (username, password)
ftp.cwd(directory)
f = gzip.open(input_file, 'r')
gz_content = f.read()
lines=csv.reader(StringIO.StringIO(gz_content))
output_file = open(output_file, 'w')
for line in lines:
line = repr(line)[1:-1]
line = line.replace("'","")
line = line.replace(" ","")
output_file.write(line + "\n")
output_file.close
f.close()
尝试类似的操作(对不起,未经测试):
with gzip.open(input_file, 'r') as fin, open(output_file,'w') as fout:
csv_reader = csv.reader(fin)
csv_writer = csv.writer(fout)
csv_writer.writerows(csv_reader)