12/1/2021

Python In

The in keyword has two purposes: The in keyword is used to check if a value is present in a sequence (list, range, string etc.). The in keyword is also used to iterate through a sequence in a for loop. Python is a high-level, general-purpose and a very popular programming language. Python programming language (latest Python 3) is being used in web development, Machine Learning applications, along with all cutting edge technology in Software Industry. Python Programming Language is very well suited for Beginners, also for experienced programmers with other programming languages like C and Java.

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  • Python’s built-in set type has the following characteristics: Sets are unordered. Set elements are unique. Duplicate elements are not allowed. A set itself may be modified, but the elements contained in the set must be of an immutable type. Let’s see what all that means, and how you can work with sets in Python. A set can be created in two ways.
  • Python If with OR. You can combine multiple conditions into a single expression in Python if, Python If-Else or Python Elif statements. In the following examples, we will see how we can use python or logical operator to form a compound logical expression. Python OR logical operator returns True if one of the two operands provided to it evaluates to true.
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The Python standard library ipaddress also suffers from the critical IP address validation vulnerability identical to the flaw that was reported in the 'netmask' library earlier this year.

The researchers who had discovered the critical flaw in netmask, also discovered the same flaw in this Python module and have procured a vulnerability identifier: CVE-2021-29921.

The regression bug crept into Python 3.x's ipaddress module as a result of a change made in 2019 by Python maintainers.

Python Interview Questions

Leading zeroes stripped from IP addresses

In March, BleepingComputer had first reported on a critical IP validation vulnerability in the netmask library used by thousands of applications.

The vulnerability, tracked by CVE-2021-28918 (Critical), CVE-2021-29418 (Medium), and CVE-2021-29424 (High) existed in both npm and Perl versions of netmask, and some other similar libraries.

It turns out, the ipaddress standard library introduced in Python 3.3 is also impacted by this vulnerability, as disclosed this week by Victor Viale, Sick Codes, Kelly Kaoudis, John Jackson, and Nick Sahler.

Python Input

Tracked as CVE-2021-29921, the bug concerns improper parsing of IP addresses by the ipaddress standard library.

Python's ipaddress module provides developers with functions to easily create IP addresses, networks, and interfaces; and to parse/normalize IP addresses inputted in different formats.

An IPv4 address can be represented in a variety of formats, including decimal, integer, octal, and hexadecimal, although most commonly seen IPv4 addresses are expressed in the decimal format.

For example, BleepingComputer's IPv4 address represented in decimal format is 104.20.59.209, but the same can be expressed in the octal format as, 0150.0024.0073.0321.

Say you are given an IP address in decimal format, 127.0.0.1, which is widely understood as the local loopback address or localhost.

If you were to prefix a 0 to it, should an application still parse 0127.0.0.1 as 127.0.0.1 or something else?

Try this in your web browser. In tests by BleepingComputer, typing 0127.0.0.1/ in Chrome's address bar has the browser treating the entire string as an IP address in octal format.

Python Divide Operator

On pressing enter or return, the IP in fact changes to its decimal equivalent of 87.0.0.1, which is how most applications are supposed to handle such ambiguous IP addresses.