How to check is upload file is CSV or XLS。 如何在python中检查它。我正在将文件导入openerp中的二进制字段,该字段可以作为二进制对象进行检索。我需要读取文件并将数据导入表中。用户可以上传csv或xls文件。只知道我可以使用csv包或xlrd包。
答案 0 :(得分:5)
hex signature for an .xls
文件如下:
Excel电子表格子标题(MS Office)
09 08 10 00 00 06 05 00 [512 byte offset]
您可以在Wikipedia上了解其他各种签名。
我相信你可以做这样的事情。这是未经测试的,但你可以摆弄它直到它工作。如有任何建议或更改,请留下评论。谢谢!
xls_sig = b'\x09\x08\x10\x00\x00\x06\x05\x00'
offset = 512
size = 8
with open('spreadsheet.xls', 'rb') as f:
f.seek(offset) # Seek to the offset.
bytes = f.read(size) # Capture the specified number of bytes.
if bytes == xls_sig:
print 'Uploaded file is an xls.'
else:
print 'File is not an xls.'
经过测试,我可以验证它是否适用于检测.xls
个文件。
我开发了一个程序来确定文件是xls还是xlsx:
import codecs
xlsx_sig = b'\x50\x4B\x05\06'
xls_sig = b'\x09\x08\x10\x00\x00\x06\x05\x00'
filenames = [
('spreadsheet.xls', 0, 512, 8),
('spreadsheet.xlsx', 2, -22, 4)]
for filename, whence, offset, size in filenames:
with open(filename, 'rb') as f:
f.seek(offset, whence) # Seek to the offset.
bytes = f.read(size) # Capture the specified number of bytes.
print codecs.getencoder('hex')(bytes)
if bytes == xls_sig:
msg = '"{}" is an xls.'
elif bytes == xlsx_sig:
msg = '"{}" is an xlsx.'
else:
msg = '"{}" is not an Excel document.'
print msg.format(filename)
('0908100000060500', 8)
"spreadsheet.xls" is an xls.
('504b0506', 4)
"spreadsheet.xlsx" is an xlsx.
答案 1 :(得分:2)
只是对PolyWhirl帖子的扩展,其中包含一些我遇到的边缘案例。
def isExcelDoc(file):
excelSigs = [
('xlsx', b'\x50\x4B\x05\x06', 2, -22, 4),
('xls', b'\x09\x08\x10\x00\x00\x06\x05\x00', 0, 512, 8), #Saved from Excel
('xls', b'\x09\x08\x10\x00\x00\x06\x05\x00', 0, 1536, 8), #Saved from LibreOffice Calc
('xls', b'\x09\x08\x10\x00\x00\x06\x05\x00', 0, 2048, 8) #Saved from Excel then saved from Calc
]
for sigType, sig, whence, offset, size in excelSigs:
with open(file, 'rb') as f:
f.seek(offset, whence)
bytes = f.read(size)
if bytes == sig:
return True
return False
答案 2 :(得分:1)
您可以尝试,如果不能正常工作,请尝试其他方法。
import xlrd
import csv
try:
# reading the file by xlrd
...
print "Thanks for your Excel file"
except: # if you find specific Exception types, use them here
try:
# reading as CSV file
...
print "thanks for your CSV file"
except: # if you find specific Exception types, use them here
print "sorry, now way, give me some usable file."