Generate a random letter in Python
Simple: string.ascii_letters returns a string containing the lower case and upper case letters according to the current locale. random.choice returns a single, random element from a sequence.
Python
Extract first and last row of a dataframe in pandas
I think the most simple way is .iloc[[0, -1]].
Python can’t find file
I am having great difficulty getting python 3.4 to recognize a path or text file on a windows 8 system. I have tried a variety of different approaches but get the similar errors (which likely implies something simple regarding the syntax). The file itself is located in the same folder as the script file trying … Read more
How to exit an if clause
(This method works for ifs, multiple nested loops and other constructs that you can’t break from easily.) Wrap the code in its own function. Instead of break, use return. Example:
Running shell command and capturing the output
In all officially maintained versions of Python, the simplest approach is to use the subprocess.check_output function: check_output runs a single program that takes only arguments as input.1 It returns the result exactly as printed to stdout. If you need to write input to stdin, skip ahead to the run or Popen sections. If you want … Read more
“Can’t convert ‘float’ object to str implicitly”
floats can’t be implicitly converted into strings. You need to do it explicitly. But it’s better to use format.
Complex number troubles with numpy
When you specify the array x and X you need to make sure it is of complex data type, i.e: EDIT: To fix the plot you need to plot both real and imaginary parts: This gives me: ….which looks like your Matlab graph.
Eclipse, PyDev “Project interpreter not specified”
In my case it has worked with following steps Prerequisite: Python should be installed Go to Window -> Preferences -> PyDev -> Interpreters and click on “Python Interpreter”. Then click on new button and add python executable location. Example for windows: example for ubuntu: Then you can attached image and click on finish.
Error: No module named ‘fcntl’
I get the following error: So I did a pip install, which also gets an error. Search results cPython, hacking, routing and many other words are coming out. It’s a tough answer for beginners, so I want to get a more detailed solution. How should I solve it?
Hashing arrays in Python
Just try it: So you can get hash of tuple and frozenset since the are immutable, and you can’t do it for list and set because they are mutable.