You can also use awhileto loop through the elements of a list in Python. The while in Python is used to iterate over a block of code as long as the test condition is true. In the below example, inside the loop,
of files to process image_files = glob.glob("*.jpg") ### Process the list of files, but split the work across the process pool to use all CPUs ### Loop through all jpg files in the current folder ### Resize each one to size 600x600 executor.map(load_and_resize, image_files) ...
Sometimes, you may want to read a file line-by-line. To do that, you can use aforloop to loop through the file line-by-line. The following code demonstrates how to read a file line-by-line in Python: file = open('example.txt', 'r') for line in file: print(line) Handling the...
write('\n\n') # Shuffle the order of the states. states = list(capitals.keys()) random.shuffle(states) # ➍ # TODO: Loop through all 50 states, making a question for each. 测验的文件名将是capitalsquiz<N>.txt,其中<N>是来自quizNum``for循环计数器的测验的唯一数字。capitalsquiz<N>....
Iterator is like range(11), compare to list = [0,1,...,10] all data is stored in memory. Iterator only generates values from looping through the object. # to get iterator from range function x = range(10) iter(x) x.__iter__() ...
image_files = glob.glob("*.jpg") ### Process the list of files, but split the work across the process pool to use all CPUs ### Loop through all jpg files in the current folder ### Resize each one to size 600x600 executor.map(load_and_resize, image_files) ...
zip() function accepts multiple lists/tuples as arguments and returns a zip object, which is an iterator of tuples. Use zip() to Iterate Through Two Lists Pass both lists to the zip() function and use for loop to iterate through the result iterator. listA = [1, 2, 3, 4] listB ...
split()[0] return size # List of directories to check directories = ["/var/www/html", "/var/log", "/etc"] # Loop through directories and print their sizes for directory in directories: size = get_directory_size(directory) print("Size of {}: {}".format(directory, size)) 在上面的...
我们首先通过调用get_event_loop()方法获取 AsyncIO 事件循环。get_event_loop()方法返回在代码运行的平台上的 AsyncIO 的最佳事件循环实现。 AsyncIO 实现了多个事件循环,程序员可以使用。通常,对get_event_loop()的简单调用将返回系统解释器正在运行的最佳事件循环实现。 一旦我们创建了循环,现在我们通过使用create_tas...
变量是在程序运行时存储数据的好方法,但是如果您希望数据在程序完成后仍然存在,您需要将其保存到一个文件中。你可以把一个文件的内容想象成一个单独的字符串值,大小可能是千兆字节。在本章中,您将学习如何使用 Python 来创建、读取和保存硬盘上的文件。