[英]Python Listing Files Numerically
I have a set of files.我有一组文件。
In each file, there is a column that corresponds to a file number.在每个文件中,有一列对应于一个文件编号。 They all are named in this format:
它们都以这种格式命名:
test_file_page_#_out_of_7000.txt
Example:例子:
test_file_page_1_out_of_7000.txt
test_file_page_2_out_of_7000.txt
test_file_page_7000_out_of_7000.txt
When I run the following code: output_pages = os.listdir()当我运行以下代码时: output_pages = os.listdir()
The files are listed in this order:这些文件按以下顺序列出:
'test_file_Page_10_out_of_7000.txt', 'test_file_Page_11_out_of_7000.txt', ..., 'test_file_Page_1_out_of_7000.txt', 'test_file_Page_2_out_of_7000.txt'
I would like the files listed in this order:我想要按此顺序列出的文件:
'test_file_Page_1_out_of_7000.txt', 'test_file_Page_2_out_of_7000.txt', ..., 'test_file_Page_10_out_of_7000.txt', 'test_file_Page_11_out_of_7000.txt'
Any suggestions?有什么建议么?
The sorted
method takes a key
argument, which is a function that takes a list element and returns the value that should be used for sorting: sorted
方法接受一个key
参数,它是一个 function,它接受一个列表元素并返回应该用于排序的值:
def get_number(filename):
return int(filename.split("_")[3])
files = sorted(os.listdir(), key=get_number)
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