I want to implement a machine learning algorithm in scikit learn, but I don’t understand what this parameter random_state does? Why should I use it? I also could not understand what is a Pseudo-random number. 7 Answers 7
I have a Python set that contains objects with __hash__ and __eq__ methods in order to make certain no duplicates are included in the collection. I need to json encode this result set, but passing even an empty set to the json.dumps method raises a TypeError. File “/usr/lib/python2.7/json/encoder.py”, line 201, in encode chunks = self.iterencode(o, … Read more
How can I get the name of an exception that was raised in Python? e.g., try: foo = bar except Exception as exception: name_of_exception = ??? assert name_of_exception == ‘NameError’ print “Failed with exception [%s]” % name_of_exception For example, I am catching multiple (or all) exceptions, and want to print the name of the exception … Read more
I’m on Windows 8, using Anaconda 1.7.5 64bit. I created a new Anaconda environment with conda create -p ./test python=2.7 pip from C:\Pr\TEMP\venv\. This worked well (there is a folder with a new python distribution). conda tells me to type activate C:\PR\TEMP\venv\test to activate the environment, however this returns: No environment named “C:\PR\temp\venv\test” exists in … Read more
I see I can’t do: “%b %b” % (True, False) in Python. I guessed %b for b(oolean). Is there something like this? 6 Answers 6
I want to read a .xlsx file using the Pandas Library of python and port the data to a postgreSQL table. All I could do up until now is: import pandas as pd data = pd.ExcelFile(“*File Name*”) Now I know that the step got executed successfully, but I want to know how i can parse … Read more
I’m trying to play with inter-process communication and since I could not figure out how to use named pipes under Windows I thought I’ll use network sockets. Everything happens locally. The server is able to launch slaves in a separate process and listens on some port. The slaves do their work and submit the result … Read more
I am sure there is an obvious way to do this but cant think of anything slick right now. Basically instead of raising exception I would like to get True or False to see if a value exists in pandas df index. import pandas as pd df = pd.DataFrame({‘test’:[1,2,3,4]}, index=[‘a’,’b’,’c’,’d’]) df.loc[‘g’] # (should give False) … Read more
Long story short: pythonw.exe does nothing, python.exe accepts nothing (which one should I use?) test.py: print “a” CMD window: C:\path>pythonw.exe test.py <BLANK LINE> C:\path> C:\path>python.exe test.py File “C:\path\test.py”, line 7 print “a” ^ SyntaxError: invalid syntax C:\path> Please tell me what I’m doing terrible wrong. 6 Answers 6
I am trying to get the date of the previous month with python. Here is what i’ve tried: str( time.strftime(‘%Y’) ) + str( int(time.strftime(‘%m’))-1 ) However, this way is bad for 2 reasons: First it returns 20122 for the February of 2012 (instead of 201202) and secondly it will return 0 instead of 12 on … Read more
