classSingleton(object):"""The famous Singleton class that can only have one instance."""_instance=None def__new__(cls,*args,**kwargs):"""Create a new instance of the class if one does not already exist."""ifcls._instance is not None:raiseException("Singleton class can only have one...
阅读本文大概需要 6 分钟。 异步IO 是一种并发编程设计,Python3.4 开始,已经有专门的标准库 asyncio 来支持异步 IO 操作。你可能会说,我知道并发用多线程,并行用多进程,这里面的知识已经够我掌握的了,异步 IO 又是个什么鬼?本文将会回答该问题,从而使你更加牢固地掌握Python的异步 IO 操作方法。 几个名词先解...
classErrors(ExceptionGroup):def__new__(cls,errors,exit_code):self=super().__new__(Errors,f"exit code:{exit_code}",errors)self.exit_code=exit_codereturnselfdefderive(self,excs):returnErrors(excs,self.exit_code) 继承关系: BaseException+--BaseExceptionGroup+--Exception+--ExceptionGroup[Base...
数据可视化：matplotlib、seaborn、bokeh、pyecharts 数据报表：dash 以python操作excel为例，使用xlwings生成...
print(coro.__class__) # <class 'coroutine'> asyncio.run(coro) # Hello, world! 从语法层面上来说,hello_world函数是个coroutine函数。但是运行时,hello_world函数的类型依然是function,这个函数调用之后的返回对象coro是一个coroutine对象。 await + coroutine ...
classException(BaseException):""" Common base class for all non-exit exceptions. """def__init__(self, *args, **kwargs):# real signature unknownpass@staticmethod# known case of __new__def__new__(*args, **kwargs):# real signature unknown""" Create and return a new object. See hel...
#the path of jvm.dllclasspath ="F:\\test\\cipher"#the path of PasswordCipher.classjvmArg ="-Djava.class.path="+classpathifnotjpype.isJVMStarted():#test whether the JVM is startedjpype.startJVM(jvmPath,jvmArg)#start JVMjavaClass = jpype.JClass("PasswordCipher")#create the Java class...
wb = xw.Book()# this will create a new workbook wb = xw.Book('FileName.xlsx')# connect to a file that is open or in the current working directory wb = xw.Book(r'C:\path\to\file.xlsx')# on Windows: use raw strings to escape backslashes ...
class FOCController: def __init__(self, p, i): self.Kp = p # 比例系数 self.Ki = i # 积分系数 self.id_error_sum = 0.0 # d轴电流误差累积 self.iq_error_sum = 0.0 # q轴电流误差累积 def control(self, vd, vq, id_ref, iq_ref, id_fb, iq_fb): ...
flash_home_path_master = None flash_home_path_slave = None item_str = lambda key, value: f'<{key}>{value}</{key}>' log_info_dict = {LOG_INFO_TYPE : logging.info, LOG_WARN_TYPE : logging.warning, LOG_ERROR_TYPE : logging.error} class OPIExecError(Exception): """OPI executes ...