李爱涛的博客

Sigmoid激活函数import math import numpy as npimport matplotlib.pyplot as pltx = np.arange(-10,10)a=np.array(x)y1=1/(1+math.e**(-x))y2=math.e**(-x)/((1+math.e**(-x))**2)plt.xlim(-11,11)ax = pl...

 实现多个字符串的批量转换import reimport oss = os.seproot = "G:\daizhuan"for i in os.listdir(root): if os.path.isfile(os.path.join(root,i)): print ("i") filePath = os.path.join(...

def text_create(name,msg): desktop_path='C://Users/Allen/Desktop/' full_path=desktop_path+name+'.txt' file = open(full_path,'w') file.write(msg) file.close() print('Done') t...

import urllib.requesturl=urllib.request.urlopen("https://read.douban.com/provider/all").read()url=url.decode("utf-8")import repat='<div class="name">(.*?)</div>'data=re.compile(pat)...

import urllib.requestimport sslimport re#导入正则表达式模块data=urllib.request.urlopen("http://news.sina.com.cn/").read()#将网址信息读取出来，并赋值给data#headers=("","")#此处可以添加模拟http请求,详见前面博文#opener...#openerdata2=...

import urllib.requestdef use_proxy(url,proxy_addr): proxy=urllib.request.ProxyHandler({"http":proxy_addr})#使用代理服务器 opener=urllib.request.build_opener(proxy,urllib.request.HTTPHandler)#给opene...

import urllib.requestimport urllib.parseurl="http://www.iqianyue.com/mypost/"data=urllib.parse.urlencode({ "name":"allen", "pass":"123"}).encode("utf-8")req=urllib.request.Request(ur

import urllib.requestimport rekeyname="短裙"key=urllib.request.quote(keyname)#编码headers=("User-Agent","Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0...

import urllib.requesturl="https://blog.youkuaiyun.com/VABTC"header=("User-Agent","Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.53 Safari/537.36")open...

工具地址，https://github.com/lancopku/PKUSeg-python

try: print('try...') r = 10 / int('a') print('result:',r)except ValueError as e: print('ValueError:',e)except ZeroDivisionError as e: print('ZeroDivisionError:',e)finally: p...

class Student(object): count = 0 def __init__(self,name): self.name = name Student.count +=1if Student.count != 0: print('测试失败!')else: bart = Student('Bart') if Student.count != 1:...

from functools import reducedef prod(L): return reduce(lambda x,y:x * y,L)print('3 * 5 * 7 * 9 =', prod([3, 5, 7, 9]))if prod([3, 5, 7, 9]) == 945: print('测试成功!')else: print('测试失败!')

def normalize(name): n = name.upper() if len(n) > 1: n = n[0] + n[1:].lower() return nL1 = ['fgdfg', 'WER', 'DFcf']L2 = list(map(normalize, L1))print(L2)

def triangles(): L=[1] while True: L=[L[i]+[i+1] for i in range(len[L]-1)] L.insert(0,1) L.append(1)

列表生成式法：def fib(max): n, a, b = 0, 0, 1 while n < max: print(b) a, b = b, a + b n = n + 1 return 'done'生成器：generator法def fib(max): n, a, b = 0, 0, 1 while...

from functools import reducedef str2float(s):     L=s.split('.');     return reduce(lambda x,y:y+x*10,map(int,L[0]))+reduce(lambda x,y:y+x*10,map(int,L[1]))/10**len(L[1])方法2：from functools i

过滤奇数：def odd(n): return n % 2 == 1list(filter(is_odd, [1, 2, 3,4,5,6,7,8]))此处将filter换成map，可以看出map和filter的区别过滤空格：def not_empty(s): return s and s.strip()list(filter(not_empty, ['A', '', 'B'...

def createCounter(): def counter(): return next(o) def f(): i=0 while 1: i=i+1 yield i o=f() return counter

L = [('Bob', 75), ('Adam', 92), ('Bart', 66), ('Lisa', 88)]def by_name(t): return t[0]L2 = sorted(L, key=by_name)print(L2)L = [('Bob', 75), ('Adam', 92), ('Bart', 66), ('Lisa', 88)]def by_score...

class Screen(object): @property def width(self): return self._width @width.setter def width(self,value): self._width = value @property def height(self): return height._width @height.sette...

from enum import Enum>>> Month = Enum('Month', ('Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'))>>> for name,member in Month.__members__.items()...

将str型转换为int型from functools import reduce>>> def fn(x, y):... return x * 10 + y...>>> def char2num(s):... digits = {'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6...