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我正在尝试使用包含在tar.gz文件中的csv文件,并且遇到问题将正确的数据/对象传递给csv模块。Python3在tar文件中使用csv文件
说我有一个tar.gz文件,其中包含许多格式化的csv文件,如下所示。
1079,SAMPLE_A,GROUP,001,,2017/02/15 22:57:30
1041,SAMPLE_B,GROUP,023,,2017/02/15 22:57:26
1077,SAMPLE_C,GROUP,005,,2017/02/15 22:57:31
1079,SAMPLE_A,GROUP,128,,2017/02/15 22:57:38
我希望能够访问内存中的每个csv文件,而不从tar文件中提取的每个文件,并将其写入磁盘。 例如:
import tarfile
import csv
tar = tarfile.open("tar-file.tar.gz")
for member in tar.getmembers():
f = tar.extractfile(member).read()
content = csv.reader(f)
for row in content:
print(row)
tar.close()
这产生了以下错误。
for row in content:
_csv.Error: iterator should return strings, not int (did you open the file in text mode?)
我也尝试解析f作为csv模块文档中描述的字符串。
content = csv.reader([f])
以上产生相同的错误。
我试着解析文件对象f ascii。
f = tar.extractfile(member).read().decode('ascii')
但这迭代每个csv元素,而不是迭代包含元素列表的行。
['1']
['0']
['7']
['9']
['', '']
['S']
['A']
['M']
['P']
['L']
['E']
['_']
['A']
['', '']
['G']
['R']
剪断...
['2']
['0']
['1']
['7']
['/']
['0']
['2']
['/']
['1']
['5']
[' ']
['2']
['2']
[':']
['5']
['7']
[':']
['3']
['8']
[]
[]
试图既解析˚F为ASCII和读取它作为一个字符串
f = tar.extractfile(member).read().decode('ascii')
content = csv.reader([f])
产生以下输出
for row in content:
_csv.Error: new-line character seen in unquoted field - do you need to open the file in universal-newline mode?
要展示了我用以下方面的不同结果ng代码。
import tarfile
import csv
tar = tarfile.open("tar-file.tar.gz")
for member in tar.getmembers():
f = tar.extractfile(member).read()
print(member.name)
print('Raw :', type(f))
print(f)
print()
f = f.decode('ascii')
print('ASCII:', type(f))
print(f)
tar.close()
这产生以下输出。 (每个csv在本例中都包含相同的数据)。
./raw_data/csv-file1.csv
Raw : <class 'bytes'>
b'1079,SAMPLE_A,GROUP,001,,2017/02/15 22:57:30\n1041,SAMPLE_B,GROUP,023,,2017/02/15 22:57:26\n1077,SAMPLE_C,GROUP,005,,2017/02/15 22:57:31\n1079,SAMPLE_A,GROUP,128,,2017/02/15 22:57:38\n\n'
ASCII: <class 'str'>
1079,SAMPLE_A,GROUP,001,,2017/02/15 22:57:30
1041,SAMPLE_B,GROUP,023,,2017/02/15 22:57:26
1077,SAMPLE_C,GROUP,005,,2017/02/15 22:57:31
1079,SAMPLE_A,GROUP,128,,2017/02/15 22:57:38
./raw_data/csv-file2.csv
Raw : <class 'bytes'>
b'1079,SAMPLE_A,GROUP,001,,2017/02/15 22:57:30\n1041,SAMPLE_B,GROUP,023,,2017/02/15 22:57:26\n1077,SAMPLE_C,GROUP,005,,2017/02/15 22:57:31\n1079,SAMPLE_A,GROUP,128,,2017/02/15 22:57:38\n\n'
ASCII: <class 'str'>
1079,SAMPLE_A,GROUP,001,,2017/02/15 22:57:30
1041,SAMPLE_B,GROUP,023,,2017/02/15 22:57:26
1077,SAMPLE_C,GROUP,005,,2017/02/15 22:57:31
1079,SAMPLE_A,GROUP,128,,2017/02/15 22:57:38
./raw_data/csv-file3.csv
Raw : <class 'bytes'>
b'1079,SAMPLE_A,GROUP,001,,2017/02/15 22:57:30\n1041,SAMPLE_B,GROUP,023,,2017/02/15 22:57:26\n1077,SAMPLE_C,GROUP,005,,2017/02/15 22:57:31\n1079,SAMPLE_A,GROUP,128,,2017/02/15 22:57:38\n\n'
ASCII: <class 'str'>
1079,SAMPLE_A,GROUP,001,,2017/02/15 22:57:30
1041,SAMPLE_B,GROUP,023,,2017/02/15 22:57:26
1077,SAMPLE_C,GROUP,005,,2017/02/15 22:57:31
1079,SAMPLE_A,GROUP,128,,2017/02/15 22:57:38
如何让csv模块正确读取tar模块提供的内存中的文件? 谢谢。
感谢马丁,这很好地诀窍。 – Pobbel