我正在编写一个python代码来解码加密，但此时出现错误。我好像想不通。请帮忙。
SAMPLE CODE WITH LINE NUMBER:
204 def get_cwinfo(codewords):
205 l1 = codewords[0][0]
206 l2 = codewords[1][0]
207 l3 = codewords[2][0]
208 length = len(codewords)
209 z = l2%30
210 v = l3%30
211 error_level = int((z - (length-1)%3)/3)
212 num_of_rows = v+1
213 return dict({'error_level':error_level, 'num_of_rows':num_of_rows})
错误消息：
Traceback (most recent call last):
File "pdf417.py", line 301, in <module>
ret = pdf417_decode(sys.argv[1])
File "pdf417.py", line 277, in pdf417_decode
info = get_cwinfo(codewords)
File "pdf417.py", line 209, in get_cwinfo
z = l2%30
TypeError: not all arguments converted during string formatting
完整代码pdf417.py:
#!/usr/bin/python
from PIL import Image
import itertools
from pdf417dict import codewords_tbl
import sys
# Global variables
val_num = 0
pdf_mode = 'text'
text_submode = 'upper'
text_shift = False
def add_quiet_zone(im):
box = (15, 15, im.size[0]+15, im.size[1]+15)
img = Image.new('L', (im.size[0]+30, im.size[1]+30), 'white')
img.paste(im, box)
return img
def get_img(img_path):
return Image.open(img_path)
def print_img_info(im):
info = im.info
for item in info.items():
print(item[0], ': ', item[1])
print('image mode: ', im.mode)
print('image size: ', im.size)
print('file format: ', im.format)
print('image band: ', im.getbands())
print('image box: ', im.getbbox())
def each_row(im, start, end, step=1):
for y in range(start, end, step):
yield list(im.crop((2, y, im.size[0]-2, y+1)).getdata())
# not in use
def each_column(im, start, end, step=1):
for x in range(start, end, step):
yield list(im.crop((x, 0, x+1, im.size[1])).getdata())
def reformat(row_data):
return [(i[0], len(list(i[1]))) for i in itertools.groupby(row_data)]
def get_min_width(row):
return row[1][1]
def row2syms(row, mw):
#return "".join([str(i[1]/mw) for i in row])
return "".join([str(int(i[1]/mw)) for i in row])
def get_cluster(sym):
return (int(sym[0])-int(sym[2])+int(sym[4])-int(sym[6])+9)%9
pdf417_flag = False
def get_codeword(syms, which):
global pdf417_flag
start = which*8-8
sym = syms[start:start+8]
if not pdf417_flag:
if not sym == '81111113':
return 'access denied'
pdf417_flag = True
return 'start'
if len(syms[start:]) == 9:
pdf417_flag = False
return 'end'
cluster = get_cluster(sym)
k = int(cluster/3)
for j in range(0,929):
if sym == codewords_tbl[k][j]:
return (k, j)
return False
def decode_part(part):
global text_submode, text_shift
text_dict = {
'upper': "ABCDEFGHIJKLMNOPQRSTUVWXYZ ",
'lower': "abcdefghijklmnopqrstuvwxyz ",
'mixed': "0123456789&rt,:#-.$/+%*=^ ",
'punct': ";<>@[\]_`~!rt,:n-.$/"|*()?{}' "
}
ret = 'unknown'
if text_submode == 'upper':
if part == 27:
text_submode = 'lower'
return 'll'
elif part == 28:
text_submode = 'mixed'
return 'ml'
elif part == 29:
text_shift = 'punct'
return 'ps'
else:
if text_shift:
ret = text_dict[text_shift][part]
text_shift = False
else:
ret = text_dict[text_submode][part]
return ret
elif text_submode == 'lower':
if part == 27:
text_shift = 'upper'
return 'as'
elif part == 28:
text_submode = 'mixed'
return 'ml'
elif part == 29:
text_shift = 'punct'
return 'ps'
else:
if text_shift:
ret = text_dict[text_shift][part]
text_shift = False
else:
ret = text_dict[text_submode][part]
return ret
elif text_submode == 'mixed':
if part == 25:
text_submode = 'punct'
return 'pl'
elif part == 27:
text_submode = 'lower'
return 'll'
elif part == 28:
text_submode = 'upper'
return 'al'
elif part == 29:
text_shift = 'punct'
return 'ps'
else:
if text_shift:
ret = text_dict[text_shift][part]
text_shift = False
else:
ret = text_dict[text_submode][part]
return ret
elif text_submode == 'punct':
if part == 29:
text_submode = 'upper'
return 'al'
else:
if text_shift:
ret = text_dict[text_shift][part]
text_shift = False
else:
ret = text_dict[text_submode][part]
return ret
else:
return 'Error'
def decode_cw(cw):
global pdf_mode, val_num, text_submode, text_shift
if cw == 900:
pdf_mode = 'text'
text_submode = 'upper'
text_shift = False
if val_num > 0:
val = val_num
val_num = 0
num_str = '%d' % val
return (num_str[1:], '')
else:
return ''
elif cw == 902:
pdf_mode = 'num'
return ''
elif cw >= 903:
return ''
else:
if pdf_mode == 'text':
return decode_text(cw)
elif pdf_mode == 'num':
decode_number(cw)
return ''
def decode_text(cw):
H = int(cw/30)
L = cw%30
return (decode_part(H), decode_part(L))
def decode_number(cw):
global val_num
val_num *= 900
val_num += cw
def get_cwinfo(codewords):
l1 = codewords[0][0]
l2 = codewords[1][0]
l3 = codewords[2][0]
length = len(codewords)
#z = len(l2)%30
#v = len(l3)%30
z = l2%(str(30))
v = l3%30
error_level = int((z - (length-1)%3)/3)
num_of_rows = v+1
return dict({'error_level':error_level, 'num_of_rows':num_of_rows})
#return dict({'error_level': error_level, 'num_of_rows': num_of_rows})
def filter_quitezone(row_data):
#if row_data[0][0] == 255: row_data = row_data[1:]
#if row_data[-1][0] == 255: row_data = row_data[0:-1]
if row_data[0][0] == 255:
row_data = row_data[1:]
if row_data[-1][0] == 255:
row_data = row_data[0:-1]
return row_data
def filter_se_pattern(cw_of_row):
return [i[1] for i in cw_of_row[1:-1]]
def filter_err(codewords_list, error_level):
return codewords_list[:-2**(error_level+1)]
def filter_row_indicator(codewords):
return [k for i in codewords for k in i[1:-1]]
def get_content(codewords):
skip = ['ll', 'ps', 'ml', 'al', 'pl', 'as']
#return "".join( [str(k) for i in codewords for k in i if k not in skip] )
return "".join( [str(k) for i in codewords for k in i if k not in skip])
def _reset_global_vars():
global text_shift, text_submode, pdf417_flag
text_shift = False
text_submode = "upper"
pdf417_flag = False
def pdf417_decode(img_path):
mw = 0 # min-width of the barcode
codewords = []
im = add_quiet_zone(get_img(img_path))
im_h = im.size[1]
target = im.convert('L')
#print_img_info(target)
for arow in each_row(target, 0, im_h):
cw_of_row = []
tmp_row = reformat(arow)
#print 'Row: ', tmp_row
if len(tmp_row) == 1:
continue
row = filter_quitezone(tmp_row)
if not mw:
mw = get_min_width(row)
syms = row2syms(row, mw)
#print 'Syms: ', syms
#end = len(syms) // 8+1
end = int(len(syms)/8+1)
for i in range(1, end):
sym = get_codeword(syms, i)
cw_of_row.append(sym)
cw_of_row = filter_se_pattern(cw_of_row)
if cw_of_row not in codewords:
codewords.append(cw_of_row)
info = get_cwinfo(codewords)
codewords_list = [cw for row in codewords for cw in row[1:-1]]
codewords_noerr = filter_err(codewords_list, info['error_level'])
vals = [decode_cw(cw) for cw in codewords_noerr]
_reset_global_vars()
# print "*" * 80
# print "found the codewords:", codewords
# print "*" * 80
# print "data codewords:",codewords_list
# print "*" * 80
# print "codewords without error message :", codewords_noerr
# print "*" * 80
# print "found ascii text index:", vals
# print "*" * 80
# print get_content(vals)
# print "*" * 80
# print "*" * 80
return get_content(vals)[1:]
if __name__ == '__main__':
ret = pdf417_decode(sys.argv[1])
print(ret)
您的错误出现在z = l2%30的第6行。l2是str，所以不能取模30。你是说len(l2)%30吗？
固定：
def get_cwinfo(codewords):
l1 = codewords[0][0]
l2 = codewords[1][0]
l3 = codewords[2][0]
length = len(codewords)
z = len(l2)%30
v = len(l3)%30
error_level = int((z - (length-1)%3)/3)
num_of_rows = v+1
return dict({'error_level':error_level, 'num_of_rows':num_of_rows})
codewords = [["abc","def","ghi"],["abc","def","ghi"],["abc","def","ghi"]]
d = get_cwinfo(codewords)
print(d)