(2)returnstr(threading.current_thread())+": "+str(num)+" → "+str(num_add)defmain():ts=time()pool=ThreadPool(4)results=pool.map(processNum,range(4))pool.close()pool.join()for_inresults:print _print("cost time is: {:.2f}s".format(time()-ts))if__name__=="__main__":mai...
/usr/local, because Apple has deprecated use of OpenSSLinfavor of its own TLSandcrypto libraries. If you need to have this software firstinyour PATH run: echo'export PATH="/usr/local/opt/openssl/bin:$PATH"'>> ~/.bash_profile For compilers to find this software you may need toset: LD...
| Remove and return an arbitrary set element. | Raises KeyError if the set is empty. | | remove(...) | Remove an element from a set; it must be a member. | | If the element is not a member, raise a KeyError. | | symmetric_difference(...) | Return the symmetric difference of...
一般代码不要求缩进,顶行编写且不留空白。在if、while、for、def、class等保留字所在完整语句后通过英文的“:”结尾并在之后行进行缩进,表明后续代码与紧邻无缩进语句的所属关系。 缩进可以用Tab键实现,也可以用多个空格实现(一般是4个空格),但两者不能混用。建议采用4个空格方式书写代码。 2.1.2 注释 ...
chrome_options.add_argument('--headless'): 设置无头浏览器 selenium页面加载等待和检测 使用selenium打开页面以后,还不能立刻操作,需要等到待处理页面元素加载完成,这时就需要检测和等待页面元素加载。 使用time.sleep()等待 最简单的方法就是打开页面以后,使用time.sleep()强制等待一定时间,该方法只能设置一个固定时...
set logicalong the other axes.Can also add a layer of hierarchical indexing on the concatenation axis,which may be useful if the labels are the same (or overlapping) onthe passed axis number.Parameters---objs : a sequence or mapping of Series or DataFrame objectsIf a mapping is passed, th...
First add a @cache decorator to your module: Python decorators.py import functools # ... def cache(func): """Keep a cache of previous function calls""" @functools.wraps(func) def wrapper_cache(*args, **kwargs): cache_key = args + tuple(kwargs.items()) if cache_key not in ...
now.to_iso8601_string() now.add(days=2) 14、category_encoders category_encoders 是一个用于类别数据编码(转换为数值数据)的python包。该包是各种编码方法的集合,我们可以根据需要将其应用于各种分类数据。 pip install category_encoders 可以使用以下示例应用转...
set(iterable) -> new set object Build an unordered collection of unique elements. """ def add(self, *args, **kwargs): # real signature unknown """ Add an element to a set,添加元素 This has no effect if the element is already present. ...
# Execute an arbitrary shell command $ pyinfra my-server.net exec -- echo "hello world" # Install iftop apt package if not present $ pyinfra my-server.net apt.packages iftop sudo=true update=true 你也可以把它保存到部署代码文件中, from pyinfra.operations import apt apt.packages...