From `man python`:

       -u     Force stdin, stdout and stderr to  be  totally  unbuffered.   On  systems
              where it matters, also put stdin, stdout and stderr in binary mode.  Note
              that there is internal buffering in xreadlines(), readlines()  and  file-
              object  iterators  (&quot;for  line  in sys.stdin&quot;) which is not influenced by
              this option.  To work around this, you will want to use  &quot;sys.stdin.read‐
              line()&quot; inside a &quot;while 1:&quot; loop.

So what you can do is:

    /usr/bin/python -u client.py &gt;&gt; logfile 2&gt;&amp;1

Or using `tee`:

    python -u client.py | tee logfile





Instead of making it fully unbuffered you can make it linebuffered as it is normally with `sys.stdout.reconfigure(line_buffering=True)` (after `import sys` of course).

This was added in 3.7, docs: https://docs.python.org/3/library/io.html#io.TextIOWrapper.reconfigure

What does &quot;development mode&quot; mean for a facebook app? I find no exact explanation of what I can and can&#39;t do while in development mode and what&#39;s the relation with the &quot;Not available to all users because your app is not live&quot;.

Some people also refer to it as &quot;Sandbox mode&quot; so I have a lot of confusion between &quot;development mode&quot;, &quot;sandbox mode&quot;, &quot;live vs not available to general public&quot;



Facebook API &quot;This app is in development mode&quot;

I am planning to move away from &quot;floaty&quot; layouts and use CSS flexbox for future projects. I was delighted to see that all major browsers in their current versions seem to support (in one way or another) flexbox.

I headed over to [&quot;Solved by Flexbox&quot;][1] to look at some examples. However the &quot;Sticky Footer&quot; example does not seem to work in Internet&amp;nbsp;Explorer&amp;nbsp;11. I played around a bit and got it to work by adding `display:flex` to the `&lt;html&gt;` and `width:100%` to the `&lt;body&gt;`

So my first question is: Can anybody explain that logic to me? I just fiddled around and it worked, but I don&#39;t quite understand *why* it worked that way...

Then there is the &quot;Media Object&quot; example that works in all browsers except for - you guessed it - Internet&amp;nbsp;Explorer. I fiddled around with that, too, but without any success.

My second question therefore is: Is there a &quot;clean&quot; possibility to get the &quot;Media Object&quot; example working in Internet&amp;nbsp;Explorer?

  [1]: http://philipwalton.github.io/solved-by-flexbox/demos/sticky-footer/


Flexbox and Internet Explorer 11 (display:flex in &lt;html&gt;?)

I made a python script which communicates with a web server using an infinite loop.
I want to log every communication data to a file and also monitor them from terminal at same time. so I used tee command like this.

    python client.py | tee logfile

however, I got nothing from terminal nor logfile.
the python script is working fine.
what is happening here?
am I missing something?

some advice would be appreciated.
thank you in advance.

linux tee is not working with python?

I made a python script which communicates with a web server using an infinite loop.
I want to log every communication data to a file and also monitor them from terminal at same time. so I used tee command like this.
<pre><code class="hljs language-bash">python client.py | tee logfile
</code></pre>
however, I got nothing from terminal nor logfile.
the python script is working fine.
what is happening here?
am I missing something?
some advice would be appreciated.
thank you in advance.

I am trying to resize some images, most of which are JPG. But in a few images, I am getting the error:

    Traceback (most recent call last):
      File &quot;image_operation_new.py&quot;, line 168, in modifyImage
        tempImage.save(finalName);
      File &quot;/Users/kshitiz/.virtualenvs/django_project/lib/python2.7/site-     packages/PIL/Image.py&quot;, line 1465, in save
       save_handler(self, fp, filename)
      File &quot;/Users/kshitiz/.virtualenvs/django_project/lib/python2.7/site-   packages/PIL/JpegImagePlugin.py&quot;, line 455, in _save
        raise IOError(&quot;cannot write mode %s as JPEG&quot; % im.mode)
    IOError: cannot write mode P as JPEG

I am not changing the image type and I&#39;m using the pillow library. My OS is Mac OS X. How can I resolve the issue?

Getting &quot;cannot write mode P as JPEG&quot; while operating on JPG image

    f=np.loadtxt(&#39;Single Small Angle 1.txt&#39;,unpack=True,skiprows=2)
    g=np.loadtxt(&#39;Single Small Angle 5.txt&#39;,unpack=True,skiprows=2)

    x = f-g[:,:11944]
    t=range(len(x))
    m=math.log10(abs(x))

    np.polyfit(t,m)

    plt.plot(t,abs(x))
    plt.show()

I&#39;m just not sure on how to fix my issue. It keeps saying:

    m=math.log10(abs(x))
    TypeError: only length-1 arrays can be converted to Python scalars

TypeError: only length-1 arrays can be converted to Python scalars while trying to exponentially fit data

I am developing a flask registration form, and I receive an error:

    error 405 method not found.

Code:

    import os
    # Flask
    from flask import Flask, request, session, g, redirect, url_for, abort, \
         render_template, flash, Markup, send_from_directory, escape
    from werkzeug import secure_filename
        
    from cultura import app
        
    # My app
    from include import User
        
    @app.route(&#39;/&#39;)
    def index():
        return render_template(&#39;hello.html&#39;)
        
    @app.route(&#39;/registrazione&#39;, methods=[&#39;POST&#39;]) 
    def registration():
        if request.method == &#39;POST&#39;:
            username= request.form.username.data
            return render_template(&#39;registration.html&#39;, username=username)
        else :
            return render_template(&#39;registration.html&#39;)
    
**registration.html:**

    &lt;html&gt;
    &lt;head&gt; &lt;title&gt;Form di registrazione &lt;/title&gt;
     &lt;/head&gt; 
    
        &lt;body&gt;
        {{ username }}
        &lt;form id=&#39;registration&#39; action=&#39;/registrazione&#39; method=&#39;post&#39;&gt;
        &lt;fieldset &gt;
        &lt;legend&gt;Registrazione utente&lt;/legend&gt;
        &lt;input type=&#39;hidden&#39; name=&#39;submitted&#39; id=&#39;submitted&#39; value=&#39;1&#39;/&gt;
        &lt;label for=&#39;name&#39; &gt;Nome: &lt;/label&gt; 
        &lt;input type=&#39;text&#39; name=&#39;name&#39; id=&#39;name&#39; maxlength=&quot;50&quot; /&gt; &lt;br&gt;
        &lt;label for=&#39;email&#39; &gt;Indirizzo mail:&lt;/label&gt;
        &lt;input type=&#39;text&#39; name=&#39;email&#39; id=&#39;email&#39; maxlength=&quot;50&quot; /&gt;
         &lt;br&gt;
        &lt;label for=&#39;username&#39; &gt;UserName*:&lt;/label&gt;
        &lt;input type=&#39;text&#39; name=&#39;username&#39; id=&#39;username&#39; maxlength=&quot;50&quot; /&gt;
         &lt;br&gt;
        &lt;label for=&#39;password&#39; &gt;Password*:&lt;/label&gt;
        &lt;input type=&#39;password&#39; name=&#39;password&#39; id=&#39;password&#39; maxlength=&quot;50&quot; /&gt;
        &lt;br&gt;
        &lt;input type=&#39;submit&#39; name=&#39;Submit&#39; value=&#39;Submit&#39; /&gt;
         
        &lt;/fieldset&gt;
        &lt;/form&gt;
        &lt;/body&gt;
        &lt;/html&gt;

when I visit `localhost:5000/registrazione`, I receive the error.  What am I doing wrong?

Method Not Allowed flask error 405

I was looking for a way to run an external process from python script and print its stdout messages during the execution.  
The code below works, but prints no stdout output during runtime. When it exits I am getting the following error:

&gt;  sys.stdout.write(nextline) TypeError:must be str,not bytes

    p = subprocess.Popen([&quot;demo.exe&quot;],stdout = subprocess.PIPE, stderr= subprocess.PIPE)	
    # Poll process for new output until finished
    while True:
        nextline = p.stdout.readline()
        if nextline == &#39;&#39; and p.poll() != None:
            break
        sys.stdout.write(nextline)
        sys.stdout.flush()

    output = p.communicate()[0]
    exitCode = p.returncode


I am using python 3.3.2

Python 3 TypeError: must be str, not bytes with sys.stdout.write()

I had done a bit of Python long back. I am however moving over to Java now. I wanted to know if there were any differences between the Python &quot;self&quot; method and Java &quot;this&quot;.

I know that &quot;self&quot; is not a keyword while &quot;this&quot; is. And that is pretty much what I could figure out. Am I missing anything else?

Difference between Python self and Java this

I&#39;m working on an application that monitors the processes&#39; resources and gives a periodic report in Linux, but I faced a problem in extracting the open files count per process.

This takes quite a while if I take all of the files and group them according to their PID and count them.

**How can I take the open files count for each process in Linux?**

Counting open files per process

I have a Linux server with Redis installed and I want to connect to it via command line from my local Linux machine.

Is it possible to install `redis-cli` only (without `redis-server` and other tools)?

If I just copy `redis-cli` file to my local machine and run it, I have the following error:

    ./redis-cli: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.14&#39; not found (required by ./redis-cli)


Linux - Install redis-cli only

I am familiar to setup the cron scheduler using `crontab -e` command on my `centos`. But today I found one of my `centos` servers doesn&#39;t have this command

I have tried to install this using `yum install crontab` but no luck. Then I tried `yum install crontabs` and it installed something

    =============================================================================
     Package                 Arch       Version          Repository        Size 
    =============================================================================
    Updating:
     crontabs                noarch     1.10-11.el5      base              7.0 k
    
    Transaction Summary
    =============================================================================
    Install      0 Package(s)         
    Update       1 Package(s)         
    Remove       0 Package(s)         
    
    Total download size: 7.0 k
    Is this ok [y/N]:

But still the `crontab` command doesn&#39;t work. If I do `cat /etc/crontab` then it shows below thing

    SHELL=/bin/bash
    PATH=/sbin:/bin:/usr/sbin:/usr/bin
    MAILTO=root
    HOME=/
    
    # run-parts
    40 * * * * root run-parts /etc/cron.hourly
    54 1 * * * root run-parts /etc/cron.daily
    14 3 * * 0 root run-parts /etc/cron.weekly
    38 1 16 * * root run-parts /etc/cron.monthly

What should I do to have `crontab` on that particular server? I am using `CentOS release 5.2 (Final)`.

grep on cron shows:

    [root~]# ps -ef | grep cron
    root     24022 24001  0 19:07 pts/1    00:00:00 grep cron

starting cron service returns: 
   
    [root~]# service cron start
    cron: unrecognized service

How to install crontab on Centos

I used the usual: 

    yum install git

It did not install the latest version of git on my CentOS 6. How can I update to the latest version of git for CentOS 6? The solution can be applicable to newer versions of CentOS such as CentOS 7.

How to install latest version of git on CentOS 8.x/7.x/6.x

After I update my Docker version to `0.8.0`, I get an error message while entering `sudo docker version`:

    Client version: 0.8.0
    Go version (client): go1.2
    Git commit (client): cc3a8c8
    2014/02/19 12:54:16 Can&#39;t connect to docker daemon. Is &#39;docker -d&#39; running on this host?

And I&#39;ve followed the instructions and entered command `sudo docker -d`, and I got this:

    [/var/lib/docker|2462000b] +job initserver()
    [/var/lib/docker|2462000b.initserver()] Creating server
    open /var/lib/docker/aufs/layers/cf2414da53f9bcfaa48bc3d58360d7f1cfd3784e4fe51fbef95197709dfc285d: no such file or directory[/var/lib/docker|2462000b] -job initserver() = ERR (1)
    2014/02/19 12:55:57 initserver: open /var/lib/docker/aufs/layers/cf2414da53f9bcfaa48bc3d58360d7f1cfd3784e4fe51fbef95197709dfc285d: no such file or directory

How do I solve the problem?


Content Type	Original Author	Original Content on Stackoverflow
Question	daehee	View Question on Stackoverflow
Solution 1 - Python	Vor	View Answer on Stackoverflow
Solution 2 - Python	stefanct	View Answer on Stackoverflow

linux tee is not working with python?

Python Problem Overview

Python Solutions

Solution 1 - Python

Solution 2 - Python

Flexbox and Internet Explorer 11 (display:flex in <html>?)

Facebook API "This app is in development mode"

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