   # Python: Transpose a matrix in Single line in Python?

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Python: Transpose a matrix in Single line in Python? posted Jul 16, 2017
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What's the problem with Python 3.x? It was first released in 2008, but web hosting companies still seem to offer Python 2.x rather.

For example, Google App Engine only offers Python 2.7. What's wrong?...

+1 vote

I seem to stumble upon a situation where "!=" operator misbehaves in python2.x. Not sure if it's my misunderstanding or a bug in python implementation. Here's a demo code to reproduce the behavior -

From __future__ import unicode_literals, print_function

``````class DemoClass(object):
def __init__(self, val):
self.val = val

def __eq__(self, other):
return self.val == other.val

x = DemoClass('a')
y = DemoClass('a')

print("x == y: {0}".format(x == y))
print("x != y: {0}".format(x != y))
print("not x == y: {0}".format(not x == y))
``````

In python3, the output is as expected:

``````x == y: True
x != y: False
not x == y: False
``````

In python2.7.3, the output is:

``````x == y: True
x != y: True
not x == y: False
``````

which is not correct!!

Given a binary matrix, find out the maximum size square sub-matrix with all 1 s, Recusively

For example, consider the below binary matrix.
(Source:- geeksforgeeks

``````   0  1  1  0  1
1  1  0  1  0
0  1  1  1  0
1  1  1  1  0
1  1  1  1  1
0  0  0  0  0
``````

The maximum square sub-matrix with all set bits is

``````1  1  1
1  1  1
1  1  1
``````

As we know it's general solution is with DP, but here i am interested in Recursive Approach

I'm starting a new project from scratch so I think its finally a time to switch to the latest and greatest Python 3.4.

But I'm puzzled with MySQL support for Python 3. So far the only stable library I've found it pymysql.

All others are either abandoned work-in-progress projects or do not support Python 3:

• mysqldb - Python 2.x only
• mysql-ctypes - Python 2.x only
• amysql - Python 2.x only
• ultramysql - Python 2.x only
• MySQL Connector/Python - new guy in block. Does anyone use it?
• WebScaleSQL + MySQLdb1 - still in development, state unknown?

So what library do you use for MySQL access in Python 3? I'm specifically interested in async support (like in psycopg2 for PostgreSQL) since I'm planning to use Tornado.

``````job1 = multiprocessing.Process(CMD1())