append(future) # Iterate over the results list and get the result of each future object for future in results: # Get the response object from the future object response = future.result() # Check if the response object is None or not if response is not None: # Process the response ...
active_items = set() inactive_items = set() # Iterate over all items for item in chain(active_items, inactive_items): # Process item 这当然比写两个单独的循环要优雅许多。 chain() 接受一个或多个可迭代对象作为输入的参数,然后创建一个迭代器,依次返回每个迭代器中的元素。这种方法比将两个对象...
生成器是迭代器,但你只能遍历它一次(iterate over them once) 因为生成器并没有将所有值放入内存中,而是实时地生成这些值 >>> mygenerator = (x*x for x in range(3)) >>> for i in mygenerator: ... print(i) 0 1 4 这和使用列表解析地唯一区别在于使用()替代了原来的[] 注意,你不能执行for ...
System.out.println("iterate over the true bits in a BitSet"); //或直接迭代BitSet中bit为true的元素iterate over the true bits in a BitSet for (int i = bitSet.nextSetBit(0); i >= 0; i = bitSet.nextSetBit(i + 1)) { System.out.print(i+"\t"); } System.out.println("---");...
# Iterate over the path_to_scanforroot, directories, filesinos.walk(path_to_scan): 通常会创建第二个 for 循环,如下面的代码所示,以遍历该目录中的每个文件,并对它们执行某些操作。使用os.path.join()方法,我们可以将根目录和file_entry变量连接起来,以获取文件的路径。然后我们将这个文件路径打印到控制台上...
# Iterate over all items for item in chain(active_items, inactive_items): # Process item 扁平化处理嵌套型的序列 将一个多层嵌套的序列展开成一个单层列表 #!/usr/bin/env python3 # -*- encoding: utf-8 -*- """ @File : Untitled-1.py ...
The code above finds all the files in some_directory/, iterates over them and uses .endswith() to print out the filenames that have the .txt file extension. Running this on my computer produces the following output:Shell data_01.txt data_03.txt data_03_backup.txt data_02_backup....
Then, you start a for loop over the collections and iterate over each of them to print their elements to the screen. Even though the built-in types are significantly different from one another, they all support iteration. The duck typing system allows you to create code that can work with...
This script iterates over the paths in theimagesfolder and for each path it runs the create_thumbnail function. This function uses Pillow to open the image, create a thumbnail, and save the new, smaller image with the same name as the original but with_thumbnailappended to the name. ...
Python 的迭代器语法简单,部分思想和Java8 Stream API有类似的地方(当然,Python要比Java年长),引入lambda表达式,predicate,函数式编程,行为参数化等可以做很多事情,同时和JAVA一样,对迭代行为进行了语法封装。但是本质上还是通过调用可迭代对象的迭代器来实现。