import os import time from multiprocessing import Process # 进程模块 def func(): time.sleep(2) print('in func',os.getpid(),os.getppid()) #getpid 子进程的pid getppid 父进程的pid if __name__ == '__main__': print('in main',os.getpid(),os.getppid()) p1 = Process(target=func) ...
items = ['Python', 'Java', 'C++'] del items[1] print(items) # ['Python', 'C++'] 元素位置和频次 列表的index方法可以查找某个元素在列表中的索引位置,如果找不到指定的元素,index方法会引发ValueError错误;列表的count方法可以统计一个元素在列表中出现的次数,代码如下所示。 items = ['Python', '...
import pandas as pd import cudf import time # 使用 Pandas 加载数据 start = time.time() df_pandas = pd.read_csv('ecommerce_data.csv') pandas_load_time = time.time() - start # 使用 cuDF.pandas 加载数据 start = time.time() df_cudf = cudf.read_csv('ecommerce_data.csv') cudf_load...
Queues are specially useful when passed as a parameter to a Process’ target function to enable the Process to consume data. By using put() function we can insert data to then queue and using get() we can get items from queues. See the following code for a quick example. 当队列作为参数...
由于python3.x系列不再有 raw_input函数,3.x中 input 和从前的 raw_input 等效,把raw_input换成input即可。 SyntaxError: multiple statements found while compiling a single statement 这是因为整体复制过去运行而产生的错误;解决方案如下: 方法一:先将第一行复制,敲一下回车,再将剩下的部分复制过去,运行; ...
importunittest from src.demo.calculatorimportCalculatorclassTestCalculatorWithFixture(unittest.TestCase):# 测试用例前置动作 defsetUp(self):print("test start")# 测试用例后置动作 deftearDown(self):print("test end")deftest_add(self):c=Calculator()result=c.add(3,5)self.assertEqual(result,8)deftest...
fromdjango.shortcutsimportHttpResponse, render, redirectfrom.importmodelsfrom.registerformsimport*defregister(request):ifrequest.method =='POST': form_obj= RegisterForm(request.POST)#实例化一个带数据的form类对象ifform_obj.is_valid():#如果所有校验通过,返回True,否则走else代码form_obj.cleaned_data.po...
4)使用fill_value处理缺失值 importpandasaspdimportnumpyasnp df1 = pd.DataFrame({'A': [1, np.nan],'B': [3,4]}) df2 = pd.DataFrame({'A': [10,20],'B': [30,40]}) result = df1.mul(df2, fill_value=1) print(result)
from azure.ai.ml.entities import Environment custom_env_name = "aml-scikit-learn" pipeline_job_env = Environment( name=custom_env_name, description="Custom environment for Credit Card Defaults pipeline", tags={"scikit-learn": "0.24.2"}, conda_file=os.path.join(dependencies_dir, "conda.yaml...
# inputimportcollectionsprint(dir(collections))#output['AsyncGenerator','AsyncIterable','AsyncIterator','Awaitable','ByteString','Callable','ChainMap','Collection','Container','Coroutine','Counter','Generator','Hashable','ItemsView','Iterable','Iterator','KeysView','Mapping','MappingView','Muta...