Please help explain this code in Python

This question already has an answer here: How do I list all files of a directory? 31 answers 我会给它一个镜头,希望这有助于。 import os # vvvvvvv directory name of the current position in the walk (eg, /var then /var/log then /var/log/apache2, etc) # vvvvvvvv list (array) of sub directories # vvvvvvvvv list (array) of files for dirname, dirnames, filenames i

请帮助在Python中解释这段代码

这个问题在这里已经有了答案: 如何列出目录的所有文件? 31个答案 我会给它一个镜头,希望这有助于。 import os # vvvvvvv directory name of the current position in the walk (eg, /var then /var/log then /var/log/apache2, etc) # vvvvvvvv list (array) of sub directories # vvvvvvvvv list (array) of files for dirname, dirnames, filenames in os.walk('# I will have a dir

How to list directory using Python

Possible Duplicate: how to list all files of a directory in python How do I list all directory content using python and add it to a list? With Python, there so many ways to do this however, this one is the simplest i know. Please check the comments for the specifics of the output. from os import listdir list = listdir("C:UsersHelloWorldPython Programs") print list #Outputs the whole list

如何使用Python列出目录

可能重复: 如何列出python目录中的所有文件 如何使用python列出所有目录内容并将其添加到列表中? 用Python,有很多方法可以做到这一点,但这是我知道的最简单的方法。 请检查输出的具体内容的评论。 from os import listdir list = listdir("C:UsersHelloWorldPython Programs") print list #Outputs the whole list print len(list) #Checks for the length of the list print list[26] #Outputs a specific element

Python3 list files from particular directory

This question already has an answer here: How do I list all files of a directory? 31 answers Non-recursive os.walk() 4 answers Directory listing in Python 19 answers os.listdir(dir) 另请参阅仅在当前目录中列出文件

Python3从特定目录列出文件

这个问题在这里已经有了答案: 如何列出目录的所有文件? 31个答案 非递归os.walk()4个答案 Python 19目录列表的答案 os.listdir(dir) 另请参阅仅在当前目录中列出文件

python : get list all *.txt files in a directory

This question already has an answer here: How do I list all files of a directory? 31 answers Find all files in a directory with extension .txt in Python 31 answers you can use os , subprocess and glob library os library example: import os os.system("ls *.txt") this command returned all .txt file subprocess library example: my_result_command = subprocess.Popen(['ls', '-l'], stdout=lo

python:获取目录中的所有* .txt文件

这个问题在这里已经有了答案: 如何列出目录的所有文件? 31个答案 在Python中找到扩展名为.txt的目录中的所有文件31个答案 你可以使用os , subprocess和glob库 os库的例子: import os os.system("ls *.txt") 该命令返回了所有的.txt文件 subprocess库例子: my_result_command = subprocess.Popen(['ls', '-l'], stdout=log, stderr=log, shell=True) 您可以检查my_result_command并获取所有文件或.txt文件

Python: Reading all files in all directories

This question already has an answer here: How do I list all files of a directory? 31 answers Python doesn't support wildcards directly in filenames to the open() call. You'll need to use the glob module instead to load files from a single level of subdirectories, or use os.walk() to walk an arbitrary directory structure. Opening all text files in all subdirectories, one level deep

Python:读取所有目录中的所有文件

这个问题在这里已经有了答案: 如何列出目录的所有文件? 31个答案 Python不支持在open()调用的文件名中直接使用通配符。 您需要使用glob模块来从单个级别的子目录加载文件,或者使用os.walk()来遍历任意的目录结构。 打开所有子目录中的所有文本文件,深度为一级: import glob for filename in glob.iglob(os.path.join('Test', '*', '*.txt')): with open(filename) as f: # one file open, handle it,

How to get only files in directory?

This question already has an answer here: How do I list all files of a directory? 31 answers You can use os.path.isfile method: import os from os import path files = [f for f in os.listdir(dirToScreens) if path.isfile(f)] Or if you feel functional :D files = filter(path.isfile, os.listdir(dirToScreens)) “如果你需要一个文件名列表,它们都有一个特定的扩展名,前缀或者中间的任何常用字符串,使

如何获取目录中的文件?

这个问题在这里已经有了答案: 如何列出目录的所有文件? 31个答案 你可以使用os.path.isfile方法: import os from os import path files = [f for f in os.listdir(dirToScreens) if path.isfile(f)] 或者,如果你感觉功能:D files = filter(path.isfile, os.listdir(dirToScreens)) “如果你需要一个文件名列表,它们都有一个特定的扩展名,前缀或者中间的任何常用字符串,使用glob而不是编写代码来自己扫描目录内容”

IPython sys.path different from python sys.path

I generally use IPython and only recently noticed that the the search path for imports is wrong in the regular python shell. From what I understand, sys.path inherits from PYTHONPATH (although I don't know where PYTHONPATH lives), is this different in IPython? I'm worried that this effecting installations. For instance I just tried pip install --upgrade gensim which failed because it

IPython sys.path与python sys.path不同

我通常使用IPython,并且最近才注意到在常规python shell中导入的搜索路径是错误的。 据我所知,sys.path从PYTHONPATH继承(尽管我不知道PYTHONPATH的生命在哪里),这在IPython中有什么不同? 我担心这会影响安装。 比如我刚刚尝试过 pip install --upgrade gensim 因为它无法解决我已经安装的scipy依赖项,所以失败了。 所以我深入一点,在Ipython中找到了 import gensim gensim.__version__ 在python中返回.9.1 impor

minimizing a multivariate, differentiable function using scipy.optimize

I'm trying to minimize the following function with scipy.optimize : whose gradient is this: (for those who are interested, this is the likelihood function of a Bradley-Terry-Luce model for pairwise comparisons. Very closely linked to logistic regression.) It is fairly clear that adding a constant to all the parameters does not change the value of the function. Hence, I let theta_1 = 0.

使用scipy.optimize最小化多变量,可微函数

我试图用scipy.optimize最小化以下功能: 其梯度是这样的: (对于那些有兴趣的人来说,这是Bradley-Terry-Luce模型的成对比较的似然函数,与logistic回归非常紧密相关。) 很明显,为所有参数添加常量不会改变函数的值。 因此,我让 theta_1 = 0。下面是实现python中的目标函数和渐变(theta在此处变为x ): def objective(x): x = np.insert(x, 0, 0.0) tiles = np.tile(x, (len(x), 1)) combs = tiles.T

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Which Python library can I use to extract filenames from paths, no matter what the operating system or path format could be? For example, I'd like all of these paths to return me c : a/b/c/ a/b/c abc abc abc a/b/../../a/b/c/ a/b/../../a/b/c Using os.path.split or os.path.basename as others suggest won't work in all cases: if you're running the script on Linux and attempt to proces

无论使用何种操作系统/路径格式,都可以从路径中提取文件名

无论操作系统或路径格式如何,我可以使用哪种Python库从路径提取文件名? 例如,我希望所有这些路径都能返回给我c : a/b/c/ a/b/c abc abc abc a/b/../../a/b/c/ a/b/../../a/b/c 在其他情况下使用os.path.split或os.path.basename将无法在任何情况下工作:如果您在Linux上运行脚本并尝试处理经典的Windows风格路径,则它将失败。 Windows路径可以使用反斜杠或正斜杠作为路径分隔符。 因此, ntpath模块(在windows上运

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I have a Debian system currently running with python 2.5.4. I got virtualenv properly installed, everything is working fine. Is there a possibility that I can use a virtualenv with a different version of Python? I compiled Python 2.6.2 and would like to use it with some virtualenv. Is it enough to overwrite the binary file? Or do I have to change something in respect to the libraries? Jus

用virtualenv使用不同的Python版本

我有一个Debian系统,目前使用python 2.5.4运行。 我安装了virtualenv,一切正常。 是否有可能使用不同版本的Python使用virtualenv? 我编译了Python 2.6.2,并希望将它用于一些virtualenv。 覆盖二进制文件就足够了吗? 或者我必须改变与图书馆有关的事情? 创建virtualenv实例以指定要使用的Python可执行文件时,只需使用--python (或short -p )选项,例如: virtualenv --python=/usr/bin/python2.6 <path/to/ne