Questions tagged [python]

Python is an interpreted, general-purpose high-level programming language whose design philosophy emphasizes code readability.

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99
votes
8answers
194k views

How to install Python 3.6?

I'd like to install the latest Python, which is 3.6 at the time of this post. However, the repository is saying that Python 3.4.2 is the newest version. I've tried: $ sudo apt-get update $ sudo apt-...
94
votes
2answers
123k views

How can I start the python SimpleHTTPServer on port 80?

I am using this command on Ubuntu but it is starting on port 8080 and I don't have another server running so I'd like it to start on port 80. I saw ways that you could set up a bash script to do ...
64
votes
6answers
521k views

Execute shell commands in Python

I'm currently studying penetration testing and Python programming. I just want to know how I would go about executing a Linux command in Python. The commands I want to execute are: echo 1 > /proc/...
61
votes
3answers
35k views

How does /usr/bin/env know which program to use?

When I use the shebang #!/usr/bin/env python to run a script, how does the system know which python to use? if I look for a python bin path in the environment variables I find nothing. env | grep -i ...
54
votes
6answers
100k views

zipimport.ZipImportError: can't decompress data; zlib not available

On RHEL 6.6, I installed Python 3.5.1 from source. I am trying to install pip3 via get-pip.py, but I get Traceback (most recent call last): File "get-pip.py", line 19177, in <module> ...
50
votes
6answers
91k views

Using jq to extract values and format in CSV

I have the below JSON file: { "data": [ { "displayName": "First Name", "rank": 1, "value": "VALUE" }, { "displayName": "Last Name", "rank": 2, ...
47
votes
4answers
98k views

Write Python stdout to file immediately

When trying to write the stdout from a Python script to a text file (python script.py > log), the text file is created when the command is started, but the actual content isn't written until the ...
45
votes
10answers
131k views

Change the Python3 default version in Ubuntu

I am using Ubuntu 16.04 LTS . I have python3 installed. There are two versions installed, python 3.4.3 and python 3.6 . Whenever I use python3 command, it takes python 3.4.3 by default. I want to use ...
36
votes
4answers
184k views

How to install the latest Python version on Debian separately or upgrade?

I'm still new to Linux, so I'm still trying to understand where executables and their libraries are and how to install packages, so I have Debian Wheezy 7.3 which has these Python versions: Python 2....
34
votes
5answers
21k views

How can I use environment variables in my shebang?

I have a Python script that need to be run with a particular python installation. Is there a way to craft a shebang so that it runs with $FOO/bar/MyCustomPython?
33
votes
4answers
70k views

How do you list number of lines of every file in a directory in human readable format.

I have a list of directories and subdirectories that contain large csv files. There are about 500 million lines in these files, each is a record. I would like to know How many lines are in each ...
32
votes
5answers
25k views

Recommended way of installing python packages on Arch

What's the recommended way of installing python packages on Arch? Searching for them on the AUR and installing them from there (or create a PKGBUILD file to make a package yourself) or using pip? I ...
29
votes
10answers
83k views

How to restart the Python script automatically if it is killed or dies

I am running my Python script in the background in my Ubuntu machine (12.04) like this - nohup python testing.py > test.out & Now, it might be possible that at some stage my above Python ...
29
votes
4answers
3k views

python vs bc in evaluating 6^6^6

I am evaluating the expression 6^6^6 using python and bc separately. The content of the python file is print 6**6**6. When I execute time python test.py, I get the output as real 0m0.067s ...
24
votes
12answers
13k views

Converting CSV to TSV

I have a number of large CSV files and would like them in TSV (tab separated format). The complication is that there are commas in the fields of the CSV file, eg: A,,C,"D,E,F","G",I,"K,L,M",Z ...
24
votes
6answers
13k views

How do I make python programs behave like proper unix tools?

I have a few Python scripts laying around, and I'm working on rewriting them. I have the same problem with all of them. It's not obvious to me how to write the programs so that they behave like ...
22
votes
2answers
89k views

Running Python on ChromeOS

Is it possible to run the Python interpreter on a ChromeOS machine? I've found various editors you can use, but I would like the ability to run python applications as well. I would like to purchase ...
21
votes
5answers
3k views

Pip vs Package Manager for handling Python Packages

Python packages are frequently hosted in many distribution's repositories. After reading this tutorial, specifically the section titled "Do you really want to do this" I have avoided using pip and ...
21
votes
5answers
23k views

Using different versions of Python

Background: Since I develop python programs that must run on different python versions, I have installed different versions of python on my computer. I am using FC 13 so it came with python 2.6 pre-...
20
votes
5answers
3k views

Why is there an EOF in the middle of the arguments?

I wanted to write a little bash function such that I can tell bash, import os or from sys import stdout and it will spawn a new Python interpreter with the module imported. The latter from function ...
20
votes
3answers
4k views

Why is coreutils sort slower than Python?

I wrote the following script to test the speed of Python's sort functionality: from sys import stdin, stdout lines = list(stdin) lines.sort() stdout.writelines(lines) I then compared this to the ...
19
votes
5answers
26k views

Install PIL/Pillow via pip in Debian testing (Jessie)

On Debian testing (Jessie), when I try to install PIL or Pillow (python imaging libs) in a virtualenv via pip I get the following error: running egg_info writing Pillow.egg-info/PKG-INFO writing top-...
19
votes
4answers
19k views

What is the proper way to manage multiple python versions?

I have a machine with Python 2.6 installed as the default Python. Then, I installed Python 2.7, and manually created /usr/bin/python as a symlink to the new installation. Then, I was running into ...
18
votes
3answers
32k views

how to keep a python script running when I close putty

I'm about to run an python script on Ubuntu on VPS. It's is machine learning training process so take huge time to train. How can I close putty without stopping that process.
18
votes
5answers
31k views

How to display the name of the current Virtualenv?

I'm using virtualenv, virtualenvwrapper, zsh, oh-my-zsh, terminator, on Crunchbang. I'm trying to display the name of the current virtualenv like so workon example (example)... I've tried many ...
17
votes
8answers
54k views

Parse JSON using Python?

I have a JSON file members.json as below. { "took": 670, "timed_out": false, "_shards": { "total": 8, "successful": 8, "failed": 0 }, "hits": { "total": 74, ...
17
votes
5answers
2k views

How can I sort a list with major.minor.patch level and sometimes rc correctly?

I have to sort the following list with a shell script and make the latest version appear on the bottom or top. How would I do that with shell tools only? release-5.0.0.rc1 release-5.0.0.rc2 release-5....
16
votes
7answers
15k views

Why does my Python background process end when SSH session is terminated?

I have a bash script that starts up a python3 script (let's call it startup.sh), with the key line: nohup python3 -u <script> & When I ssh in directly and call this script, the python ...
16
votes
6answers
29k views

Why is this python error message generated whenever I type a nonsense command?

Whenever I type any "nonsense" command, this python error message is generated. Normal commands work fine. Any idea how to debug this? $ somenonexistingcommand Traceback (most recent call last): ...
15
votes
5answers
6k views

How can I have more than one possibility in a script's shebang line?

I'm in a bit of an interesting situation where I have a Python script that can theoretically be run by a variety of users with a variety of environments (and PATHs) and on a variety of Linux systems. ...
15
votes
5answers
13k views

How to list all object paths under a dbus service?

This is a follow-up question to A list of available DBus services. The following python code will list all available DBus services. import dbus for service in dbus.SystemBus().list_names(): ...
15
votes
3answers
25k views

On which unix distributions is Python installed as part of the default install?

Does anyone know of an overview that would document on which (recent) UNIX distributions Python is available by default, i.e. part of the default installation? PS: Answers from StackOverflow, before ...
14
votes
7answers
13k views

How can I rename photos, given the EXIF data?

Let's say I have a bunch of photos, all with correct EXIF information, and the photos are randomly named (because of a problem I had). I have a little program called jhead which gives me the below ...
14
votes
2answers
7k views

Error with command iotop on CentOS

When using sudo iotop (latest version 0.6-2.el7) in a terminal in my newly installed CentOS 7.5, I get the following error message: Traceback (most recent call last): File "/sbin/iotop", line 17, ...
14
votes
3answers
54k views

uninstall Python installed by compiling source?

I installed Python 2.7.9 on Ubuntu 14.04 by compiling its source, by .configre, make, and make altinstall. make altinstall is because I don't want to overwrite the default Python 2.7.6. My self ...
14
votes
4answers
19k views

Replace multiline string in files

I have a number of files I want to update by replacing one multi-line string with another multi-line string. Something along the lines of: * Some text, * something else * another thing And I want ...
13
votes
4answers
8k views

Why does python still work after being removed?

On Debian 8 jessie I've removed python: perry@perry:~$ sudo apt-get remove python Reading package lists... Done Building dependency tree Reading state information... Done Package 'python2.7' ...
13
votes
4answers
8k views

How can I replace bash with Python?

According to the accepted answer for this SO question: , Python can make a great bash replacement. My question then, is this: how do I go about making a seamless switch? I think the main thing to ...
13
votes
5answers
94k views

how to execute a bash command in a python script

How can I launch a bash command with multiple args (for example "sudo apt update") from a python script?
13
votes
3answers
60k views

Is it possible to pass arguments into a Python script?

I know how to pass arguments into a shell script. These arguments are declared in AWS datapipeline and passed through. This is what a shell script would look like: firstarg=$1 secondarg=$2 How do I ...
13
votes
3answers
54k views

Running python script from terminal without .py extension

I want to call a python script script.py from the terminal by simply typing script. Is this possible? If so, how? I know I can avoid typing python script.py by adding #!/usr/bin/env python to the top ...
13
votes
5answers
8k views

How do I get 'realpath' to find my symbolic link?

I am on MacOSX using bash as my shell. I have symbolic link, created like this: ln -s /usr/bin/python python2 I have a package that uses python2 and I want to create a symbol link in my current ...
13
votes
1answer
31k views

Repairing python setup

On my Kubuntu 14.4 (which has python 2.7.6 as standard) my python is broken after I tried to install python 2.7.10 after building from source from python.org with the help of How to install the latest ...
13
votes
2answers
5k views

Using Atlas from scipy

I installed Ubuntu 12.04 64 bit. I need to work with python and scipy, I installed them and when I run the test: python -c "import scipy; scipy.test()" I get the message: ImportError: libatlas.so....
13
votes
2answers
6k views

Best way to upgrade vim/gvim to 7.3 in Ubuntu 10.04?

I have to use Ubuntu 10.04 at work, and can't upgrade it. I'm using Vim/gVim 7.2. I want to upgrade it to 7.3 (with Python and Ruby extension support). Which is the best way? Add an entry in sources....
13
votes
2answers
54k views

What is the python equivalent of grep -v?

I like grep -v. I use it all the time. But I am also doing some text processing in python, and there is one crucial thing that I lack. Usually, I use grep -v to take extraneous stuff out of text. ...
13
votes
2answers
549 views

How do I activate Xorg record module on Raspbian?

I'm trying to automate some tests on my RaspberryPi and I'm using python's pymouse to perform some emulated clicks. On my Debian it works fine, but when it comes to Raspbian it keeps failing with this ...
12
votes
1answer
22k views

How to activate Virtualenv when a Python script starts?

I want to schedule a python script to run using cron on certain dates, the problem is that in order for example.py to work, example-env has to be activated, is there a way to make example.py activate ...
12
votes
2answers
50k views

Why can't I load modules while executing my bash script, but only when sourcing it?

I am using modules to control the packages on my system and I have python/2.7.2 installed as a module. I have simple python executable python_exe.py which I am going to call from a simple 'driving' ...
12
votes
2answers
10k views

Install newer & older versions of python on debian?

How can I install extra versions of python on Debian (jessie). On Ubuntu I can use the "deadsnakes" PPA which will give me any python version I want, with the version name in the command (e.g. ...