Linux Kernel 4.19.70 Release

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This post summarizes new features, bugfixes and changes in Linux kernel release 4.19.70. Linux 4.19.70 Release contains 95 changes, patches or new features. In total, there are 101,521 lines of Linux source code changed/added in Linux 4.19.70 release compared to Linux 4.19 release. To view the source code of Linux 4.19.70 kernel release online, please
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4 Features of Python 3.9 That You Can’t Take Your Eyes Off

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Python is one of the most popular programming languages in the world. It is widely popular for a plethora of tasks due to its flexible nature and ease of use. Python has also managed to beat other programming languages such as Java, which were once upon a time, the world’s favorite. In fact, the extent
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How to Install Hyperledger Fabric 2.0 in Ubuntu 18.04

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Hyperledger Fabric is a consortium blockchain system. It’s performance is relatively good and its modular architecture enables it to be usable in many scenarios. Hyperledger Fabric itself has rich documents and samples of test networks. For beginners, deploying a new network for trying and testing still consumes quite some time. In this post, we will
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How to get date and time from another timezone in Python?

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How to get the date and time from another timezone in Python? You may use the pytz library. Example usage as follows. $ python3 Python 3.8.2 (default, Jul 16 2020, 14:00:26) >>> from datetime import datetime >>> import pytz >>> >>> print(datetime.now(pytz.timezone(‘Europe/Amsterdam’)).strftime(‘%Y-%m-%d %H:%M:%S %Z%z’)) 2020-08-09 15:50:00 CEST+0200 >>>

How to decode a quoted URL in Python?

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How to decode a quoted URL in Python? For example, an quoted URL as follows https://www.example.com/tag/%E9%93%B6%E8%A1%8C/ should be decoded to https://www.example.com/tag/银行/ In Python 3, we can use `urllib.parse_plus()` (for URL only). One example is as follows. $ python3 Python 3.6.8 (default, Oct 7 2019, 12:59:55) [GCC 8.3.0] on linux Type “help”, “copyright”, “credits” or “license”
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`readlink -m` equivalent function in Python to get canonical file name

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readlink -m can get canonical file name by resolving every symlinks in every component of the given path recursively. In Python, the os.readlink() function does not do so. Any equivalent function in Python to the readlink -m command line? Specifically, it does: canonicalize by following every symlink in every component of the given name recursively,
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In Python, `os.makedirs()` with 0777 mode does not give others write permission

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In Python, os.makedirs() with 0777 mode can not give others write permission The code is as follows $ python Python 2.7.5 (default, Aug 4 2017, 00:39:18) [GCC 4.8.5 20150623 (Red Hat 4.8.5-16)] on linux2 Type “help”, “copyright”, “credits” or “license” for more information. >>> import os >>> os.makedirs(“/tmp/test1/test2”, 0777) >>> The created dirs are not
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How to split a string by string in Python?

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How to split a string by string in Python? For example, “a string separated by space” => [“a”, “string”, “separated”, “by”, “space”] and “a,string,separated,by,comma” => [“a”, “string”, “separated”, “by”, “comma”] Python’s string.split() standard library function, if provided a separator, will split the string by the separator, for example >>> str2 = “a,string,separated,by,,,comma” >>> str2.split(“,”) [‘a’,
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How to flush STDOUT buffer in Python?

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How to flush the STDOUT buffer in Python so that the content wrote to STDOUT is shown immediately? Call the flush library function on sys.stdout which is the STDOUT: import sys sys.stdout.flush() From python doc: flush() Flush the write buffers of the stream if applicable. This does nothing for read-only and non-blocking streams. If you
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Why “ValueError: zero length field name in format” error in Python on CentOS 6?

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The same Python program runs without any problem while it report ValueError: zero length field name in format error in Python on CentOS 6 The piece of code in Python is: print ‘== {} SPF’.format(d) Why “ValueError: zero length field name in format” error in Python on CentOS 6? This feature of {} without the
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How to get the running process’ parent process’ ID in Python?

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How to get the running process’ parent process’ ID in Python? In Python, you can get the parent process’ pid by calling os.getppid(): import os ppid = os.getppid() One example: The shell’s pid: $ echo $$ 21779 Start a python REPL and get its parent pid (the shell’s): $ python Python 2.7.5 (default, Nov 6
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Getting Hostname in Bash in Linux

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In Bash, how to get the hostname of the node running the program? In Bash, you can get the hostname of the node in at least 2 ways: Use the variable $HOSTNAME. Get the hostname by command hostname. Get the content of /proc/sys/kernel/hostname Example: $ echo $HOSTNAME host01 $ hs=`hostname` $ echo $hs host01 $
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