李爱涛的博客

Sigmoid激活函数 import math import numpy as np import matplotlib.pyplot as plt x = 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 re import os s = os.sep root = "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.request url=urllib.request.urlopen("https://read.douban.com/provider/all").read() url=url.decode("utf-8") import re pat='<div class="name">(.*?)</div>' data=re.compile(pat)...

import urllib.request import ssl import 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... #opener data2=...

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

import urllib.request import re keyname="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.request url="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 +=1 if Student.count != 0: print('测试失败!') else: bart = Student('Bart') if Student.count != 1:...

from functools import reduce def 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 n L1 = ['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 reduce def 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 == 1 list(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...