qq_38799933的博客

使用生成器 yield 逐行读取到内存def read_file(filename): with open(filename, 'r', encoding='utf-8') as f: for line in f: yield lineline_content = read_file(filename="/data.txt")for line in line_content: print line...

import numpy as nparray = np.array([[1, 2, 3], [2, 3, 4]])print (array)print ('number of dim:', array.ndim) # 求矩阵的维度print ('shape:', array.shape) # 求矩阵的形状print ('size:', array.size) # 求矩阵的大小a = np.zeros((2, 3)) # 生成一个全为零的矩阵pr

import reret = re.findall('w\w{2}l','hello world')print(ret)ret =re.findall('lzh','dsfsfsflzhfsfsffs')print(ret)元字符.通配符ret = re.findall('w..l','hello world') # .只能代指任意一个字符print(ret)^ret = re.findall('^h...o','hlsaodfhello')print(ret)$r

Python提供类似于C++ gdb的调试工具pdb，我们可以在Linux下使用pdb在命令行下进行Python程序的调试。官方参考网站：Python2： https://docs.python.org/2/library/pdb.htmlPython3： https://docs.python.org/3/library/pdb.html一般地，我们可以使用如下的方式进入调试（比如我们要调试的源文件为hello.py）：在命令行启动目标程序，加上-m参数。python -m pdb hel

1、安装pyinstaller(需要先安装pip)、再:pip install pyinstaller2、定位到pyinstaller.exe所在文件夹（一般再python下的“scripts”文件夹下）3、再添加上你要转换的文件地址（两者之间有空格），pyinstaller.exe后面如果加上-F就是打包为一个exe文件（文件会比较大），如果不加就会有很多库文件；加上-w就是打包为没有cmd...

import win32guiimport win32conimport win32clipboard as wimport timedef send(name, msg): #打开剪贴板 w.OpenClipboard() #清空剪贴板 w.EmptyClipboard() #设置剪贴板内容 w.SetClipboardData(win3...

mport threading, timeclass myThread(threading.Thread): def run(self) -> None: if semaphore.acquire(): print(self.name) time.sleep(3) semaphore.rele...

import threadingimport timefrom random import randintclass Producer(threading.Thread): def run(self) -> None: global L while True: val = randint(0,100) ...

import threading, timeclass Boss(threading.Thread): def run(self) -> None: print('boss：今晚大家都要加班到22:00。') event.isSet() or event.set() time.sleep(5) print("boss...

import queued = queue.Queue(3)d.put('jinxin') # 插入数据d.put('xiaohu')d.put('haoran',1)# FIFOprint(d.get())print(d.get())print(d.empty())print(d.queue)out： jinxin xiaohu False deque([...

import threading, timedef addNum(): global num r.acquire() # 获得锁 temp = num time.sleep(0.000001) num = temp - 1 r.release() # 释放锁num = 100thread_list = []r = threadin...

import threading, time'''class myThread(threading.Thread): def doA(self): lockA.acquire() print(self.name,'gotlockA',time.ctime()) time.sleep(3) lockB.acquire()...

import timeimport threading# python中存在的GIL（全局解释器锁）问题：在同一时刻只能有一个线程进入解释器# I/O密集型任务或函数start = time.time()def foo(n): print('foo%s'%n) time.sleep(1) print('end foo')def bar(n): ...

初识socketclient端：import socketsk = socket.socket()address = ('127.0.0.1',8000)sk.connect(address)data = sk.recv(1024)print(str(data,'utf8'))server端：'''网络通信三要素1. ip地址2. 端口号3. 传输协议'''...

try: # 代码块 passexcept IndexError as e: print('IndexError',e)except ValueError as e: print('ValueError',e)except Exception as e: # 上述代码块如果出错，则自动执行当前块内容 # e 是Exception的对象，对象中封...

class foo: def __init__(self): print('init') def __call__(self, *args, **kwargs): print('call') def __del__(self): print('析构方法') # 对象被销毁时，自动执行obj = foo() # 自...

class Foo: def __init__(self,name,age): self.name = name self.age = ageobj = Foo('alex',18)如果想通过字符串操作对象中的成员，就如下所示的方式：obj.nameb = 'name'obj.b # obj.name会报错：AttributeError:...

class Foo: def __init__(self,name,age): self.name = name self.age = age# obj = Foo() obj对象，obj也成为Foo类的实例，（实例化）obj1 = Foo('fengte',12)obj2 = Foo('dada',21)obj3 = Foo('daddf',32...

class foo: def __init__(self,name,age): self.name = name self.age = age self.__age = age # 私有，外部无法直接访问 def show(self): return self.__ageobj = foo('fengye',1...

import osfrom PIL import Imagefrom torchvision import transforms导入必要的模块file_list = os.listdir('图片路径')h = 0randomcrop = transforms.RandomCrop(99) # 随机剪裁大小为99*99randomhorizontalflip = transfor...

x = torch.rand(4,4)print('x:\n',x)print('torch.max(x,1):\n',torch.max(x,1))print('torch.max(x,0):\n',torch.max(x,0))print('torch.max(x,1)[0]:\n',torch.max(x,1)[0])print('torch.max(x,1)[1]:\n',to...

用img = cv2.imdecode(np.fromfile(a[:-1],dtype=np.uint8),cv2.IMREAD_COLOR)代替img = cv2.imread(a[:-1])就好了

1.传入多个参数的函数def add(x,y): return x + y 用lambda函数实现：a = lambda x,y :x + yprint(a(1,2))结果是32.传入一个参数的lambda函数a=lambda x:x*xprint(a(3)) 3.例3：多个参数的lambda形式：a = lambda x,y,z:(x+8)*y-zprint(a(...

用法： os.path.splitext(“文件路径”) 分离文件名与扩展名；默认返回(fname,fextension)元组，可做分片操作import ospath_01='E:\STH\Foobar2000\install.log'path_02='E:\STH\Foobar2000'res_01=os.path.splitext(path_01)res_02=os.path...

# -*- coding: utf-8 -*-# @Time : 2020/2/17 14:00# @Author : Jackey-lu# @File : logging模块.pyimport logging# logging.basicConfig(level=logging.DEBUG,# format='%(asctim...

# -*- coding: utf-8 -*-# @Time : 2020/2/17 13:16# @Author : Jackey-lu# @File : hashlib模块.pyimport hashlibm = hashlib.md5()print(m)m.update('hello world!'.encode('utf8'))print(m.hexdig...

# -*- coding: utf-8 -*-# @Time : 2020/2/16 15:30# @Author : Jackey-lu# @File : 随机数.pyimport randomprint(random.random())print(random.randint(1, 9))print(random.choice('hello'))print(r...

# -*- coding: utf-8 -*-# @Time : 2020/2/16 14:52# @Author : Jackey-lu# @File : 时间模块.pyimport time# time.sleep(3)# print(time.clock())# print(time.gmtime())# print(time.localtime())# ...

# -*- coding: utf-8 -*-# @Time : 2020/2/16 12:51# @Author : Jackey-lu# @File : 列表生成器.pya = [x for x in range(10)]print(a)s = (x*2 for x in range(10))print(s) # <generator object &l...

# -*- coding: utf-8 -*-# @Time : 2020/2/16 17:02# @Author : Jackey-lu# @File : os模块.pyimport os# print(os.getcwd()) # 获取当前工作目录路径# # print(os.chdir('dirname')) # 改变当前脚本工作目录；相当于shell下...

# -*- coding: utf-8 -*-# @Time : 2020/2/25 18:01# @Author : Jackey-lu# @File : 装饰器.pyimport time# def show_time(f): # 装饰器函数# def inner():# start = time.time()# ...

# __author: FENGYE# data: 2019/12/19f = open('./jiangjinjiu2.txt', 'r', encoding='utf8')# print(f.read(17).strip())print(f.readline().strip())print(f.readline().strip())# print(f.readlines())...

# __author: FENGYE# data: 2019/12/13st = 'hello kitty {name} is {age} 'print(st.count('l')) # 统计元素个数print(st.capitalize()) # 首字母大写print(st.center(50,'#')) #居中并且用设置的符号填pr...

#__author: FENGYE#data: 2019/12/12a = ['dadd','dasda','ligang','dasfsf','ligang','fsfsdfs','ligang']# print(max(a))# b = []# c = a.count('ligang')# d = a[-1:3:-1]print(a[1:3])## for i in a...