Yuhua Wang的博客

整理一下key排序和value排序keytmpdict = {"1":20,"2":50,"3":40,"4":100,"5":80}# key从大到小>>> for i in sorted(tmpdict.keys(),reverse=True):... print([i,tmpdict[i]])... ['5', 80]['4', 100]['3', 40]['2',

整理一下python中易忘又特别的运算异或a = 60 # 60 = 0011 1100 b = 13 # 13 = 0000 1101 c = 0c = a ^ b # 49 = 0011 0001logimport numpy as npnp.log(2.71828)# 0.99999932734728203整除a

总是忘记如何读写csv，整理一下来加强记忆读 csv文件 假设有csv文件内容为： id，score 1，100 2，80import csvdata = open("xxx.csv",'r')dataline = csv.reader(data)for i in dataline: # csv中每一行被转换为了list形式并被赋给i print i #>

整理模型存取方法路径存在判断import osif os.path.exists("./model/"): #判断路径是否存在路径创建if not os.path.exists("./model/"): os.mkdir("./model/")模型下载from sklearn.externals import joblibimport osdef download_mo