I would like to use Python for scientific applications and after some research decided that I will use Anaconda as it comes bundled with loads of packages and add new modules using conda install through the cmd is easy. I prefer to use the 64 bit version for better RAM use and efficiency but 32bit version is …
Tag: python-3.x
how to put an Item in aws DynamoDb using aws Lambda with python
Using python in AWS Lambda, how do I put/get an item from a DynamoDB table? In Node.js this would be something like: All I need is the python equivalent. Answer Using Boto3 (Latest AWS SDK for python) You import it with Then call the client via Get item example Put item example ‘S’ indicates a Str…
Problem of “Memory limit exceeded” and “Time limit exceeded” in Python
I have a problem to solve on the online judge. Its solution is to make the sum of the integer for example input 4, so 1+2+3+4 the output 10. For another example, the input is 10, so get sum of 1 to 10 to get in the output 55 and so on. But when I used a list to store
Python popen() – communicate( str.encode(encoding=”utf-8″, errors=”ignore”) ) crashes
Using Python 3.4.3 on Windows. My script runs a little java program in console, and should get the ouput: This leads to a normal ‘UnicodeDecodeError: ‘charmap’ codec can’t decode byte 0x9d in position 135: character maps to < undefined>’. Now I want to ignore errors: This l…
How to set class attribute with await in __init__
How can I define a class with await in the constructor or class body? For example what I want: or example with class body attribute: My solution (But I would like to see a more elegant way) Answer Most magic methods aren’t designed to work with async def/await – in general, you should only be usin…
What are type hints in Python 3.5?
One of the most talked-about features in Python 3.5 is type hints. An example of type hints is mentioned in this article and this one while also mentioning to use type hints responsibly. Can someone explain more about them and when they should be used and when not? Answer I would suggest reading PEP 483 and P…
Generator as function argument
Can anyone explain why passing a generator as the only positional argument to a function seems to have special rules? If we have: This works, as expected. This does not work, as expected. This works, as expected This works, but I don’t understand why. Shouldn’t it fail in the same way as 2) Answer…
Logging module not working with Python3
I am having issues with the standard logging module. If I open a python2.7 shell and import logging everything works fine: But if I open a python3.4 shell and import logging I get the following error: I have no idea what the problem is and can’t seem to find anyone else who has had the same issue. Answe…
merge few pivot tables in pandas
How I can merge two pandas pivot tables? When I try run my code I have error: keyerror Answer answer for my question is :
Why round off of 0.500000 in python differs from 45.500000 using ‘%.0f’?
Recently, I learned art of string formatting in Python 2.7. I decided to play with floating point numbers. Came across an awkward looking solution, as written below. BUT Please help me understand, why this behavior is shown by %f. Answer The internal implementation for the %.0f string format uses a round-half…