> repeat
In [1]: from itertools import repeat
In [2]: x = list(repeat(0,times=10))
In [3]: x
Out[3]: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
> OrderedDict
按照书写顺序输出字典中的元素
from collections import OrderedDict
orderdict1 = OrderedDict()
content = ((key1,val1), (key2,val2), (key3,val3))
orderdict2 = OrderedDict(content)
> filter
Help on built-in function filter in module __builtin__:
filter(...)
filter(function or None, sequence) -> list, tuple, or string
Return those items of sequence for which function(item) is true. If
function is None, return the items that are true. If sequence is a tuple
or string, return the same type, else return a list.
(END)
> CSV
# read
csvfile = file(inputfile, 'rb')
csvreader = csv.reader(csvfile)
for line in csvreader:
ISBN.append(line[0])
csvfile.close()
# write
# ASIN and isbns are list with the same of length.
Asinfile = file(outputfile,'wb')
Asinwriter = csv.writer(Asinfile)
rowdata = []
for i in xrange(len(ASIN)):
data = [isbns[i], ASIN[i]]
rowdata.append(data)
Asinwriter.writerows(rowdata)
Asinfile.close()
> codecs & unicodedata
文件字符编码问题
import codecs
file = codecs.open("lol", "w", "utf-8")
file.write(u'\ufeff')
file.close()
import unicodedata
isbn = unicodedata.normalize('NFKD', isbn).encode('utf-8','ignore')
> sys
import sys
sys.setrecursionlimit(150) #设置递归深度
> argparse
import argparse
'''
input : argv[1] or image path
output: book spine segment images which store in './Example/Dst'
Usage : $ python.py --image=
eg:
$ python main.py --image='./Example/Src/002.jpg'
'''
# Load image for command line operator
ap = argparse.ArgumentParser()
ap.add_argument("-i", "--image", required = True, help = "Path to the image")
args = vars(ap.parse_args())
InputImg = cv2.imread(args["image"]) # "./Example/Src/002.jpg"
> OptionParser
from optparse import OptionParser
parser = OptionParser()
parser.add_option("-i", "--input", action="store", dest="DateTimeFile", help="Load datetime file.")
parser.add_option("-o", "--output1", action="store", dest="bookbid", help="Write changing of book id.")
parser.add_option("-f", "--output2", action="store", dest="userid", help="Write changing of user id.")
(options,args) = parser.parse_args()
DateTimeFile = options.DateTimeFile
bookbid = options.bookbid
userid = options.userid
......
