A class attribute exists until the last reference goes away. A global variable also exists until the last reference goes away. Neither of these are guaranteed to last the entire duration of the program.Also, a class defined at module scope is a global variable. So the class (and, by implication, ... Read More

As per Python documentation ‘super’ can help in extending multiple python classes in inheritance.  It returns a proxy object that delegates method calls to a parent or sibling class of type. This is useful for accessing inherited methods that have been overridden in a class. The search order is same ... Read More

Special character dot '.'(Dot.) In the default mode, this matches any character except a newline. If the DOTALL flag has been specified, this matches any character including a newline.Special character '?'Causes the resulting RE to match 0 or 1 repetitions of the preceding RE. ab? will match either ‘a’ or ... Read More

The most basic regex features are nearly the same in nearly every implementation: wild character ., quantifiers *, +, and ?, anchors ^ and $, character classes inside [], and back references \1, \2, \3etc.Alternation is denoted | in Perl and PythonPerl and Python will let you modify a regular ... Read More

When the match method is implemented, if it turns out that there are no matches, then None is returned. There are no functions in the re module that throw up an exception when the list or matches is emptyexception re.errorException raised when a string passed to one of the functions ... Read More

We use re.findall or re.finditer methods to find all matches to a regular method.re.findall(pattern, string) returns a list of matching strings.re.finditer(pattern, string) returns an iterator over MatchObject object

By default, all .NET objects are reference types and their equality and hash code is determined by their memory address. Additionally, assigning a variable to an existing object just makes it point to that address in memory, so there is no costly copying occurring. It appears that this is true ... Read More

We need sometimes to compress Python objects (list, dictionary, string, etc) before saving them to cache and decompress after reading from cache.Firstly we need to be sure we need to compress the objects. We should check if  the data structures/objects are too big just to fit uncompressed in the cache. ... Read More

Python uses two techniques to clean up garbage. One is reference counting, which affects all objects but which can't clean up objects that directly or indirectly refer to each other. That's where the actual garbage collector comes in: python has the gc module, which searches for cyclic references in objects ... Read More

A python object or variable will be eligible for garbage collection as soon as all references to it go out of scope or are manually deleted (del x). We would have to presume there were no references to the object anywhere else for it to be garbage collected.