How-to articles, tricks, and solutions about PYTHON

In Python 2.X, range and xrange are used to generate a sequence of numbers.

You can use the ast.literal_eval() function from the ast module to safely evaluate a string and convert it to a list.

To update pip itself from inside your virtual environment, you can use the following command:

You can create an empty list of a certain size in Python using the following methods:

The error message "invalid command 'bdist_wheel'" occurs when the "bdist_wheel" module is not installed.

In Python, kwargs is a way to pass a keyworded, variable-length argument list.

In Python, the argparse module can be used to specify optional positional arguments by setting the nargs parameter to '?'.

Here is an example of how to use the pd.merge() function to merge two DataFrames in pandas:

This error message indicates that the "requests" module, which is used for making HTTP requests in Python, is not installed on your system or is not in the Python path.

You can use the os module in Python to iterate over files in a given directory.

You can use the calendar.monthrange() function from the calendar module in Python to get the last day of a month.

iloc and loc are both used to select rows and columns from a Pandas DataFrame, but they work differently.

This error occurs when you are trying to write a string to a file using the write() method in Python 3, but the file is opened in binary mode (using the 'b' flag when opening the file).

In matplotlib, you can set the font size of the figure title and axes labels using the pyplot module.

The purpose of "%matplotlib inline" in Python is to display matplotlib plots within the Jupyter notebook.

You can use the datetime module in Python to get the day of the week for a given date.

You can use the datetime.fromisoformat() method to parse an ISO 8601-formatted date in Python.

You can use the sorted() function with the key parameter to specify a function that extracts the element at the desired index.

Here is an example of how you can use Python 3 in a virtual environment using the virtualenv package:

In Python, the "at" (@) symbol is used to decorate a function.

Here is a code snippet that demonstrates how to find an element in a list in Python:

You can open multiple files using "with open" in Python by using multiple with open statements, one for each file you wish to open.

A two-dimensional array in Python can be defined using the numpy library.

In Python, you can check if a variable is not equal to None using the is not operator.

You can use the socket module in Python to get the hostname of the system.