How-to articles, tricks, and solutions about PYTHON

Here are a few alternatives to using a switch statement in Python:

Here's an example of how you can reverse or invert a dictionary mapping in Python:

In Python, you can use the subprocess module to run shell commands and capture their output.

Here is an example of how you can run unittests in Python using the typical test directory structure:

To save a plot to an image file using Matplotlib, you can use the savefig function.

You can use the .iloc[] property to select a row by its integer index in a pandas DataFrame or Series.

To select multiple columns in a pandas DataFrame, you can pass a list of column names to the indexing operator [].

If you are using Selenium with the Firefox web browser and you see the error message "Geckodriver executable needs to be in PATH," it means that the Selenium Python library cannot find the geckodriver executable on your system.

In pandas, you can set the value of a specific cell in a DataFrame using the at method.

You should include a shebang (#!) in Python scripts if you want the script to be directly executable from the command line.

It is recommended to use the in keyword to check if a key exists in a Python dict, rather than the has_key() method.

The random module in Python provides a function called shuffle() which can be used to shuffle the elements of a list.

You can use the split() method to split a string on whitespace in Python.

You can use the re.split() function from the re module in Python to split a string using multiple delimiters.

In Python, a static method is a method that belongs to a class rather than an instance of the class.

In Python, there are several ways to format strings.

In Python, there are a few different ways to style multi-line conditions in if statements, depending on the complexity of the condition and personal preference.

Here is a code snippet that demonstrates how to sum a list of numbers in Python:

The SyntaxError: unexpected EOF while parsing error is raised when the Python interpreter reaches the end of the file (EOF) while it is still parsing the file, and it is unable to complete the parsing process because of an error in the syntax of the code.

You can use the reversed() function to iterate through a list in reverse order.

The truth value of a Series in pandas can be ambiguous, as it can contain multiple values.

This error message typically occurs when you are trying to call a module as if it were a function.

The TypeError: 'NoneType' object is not iterable error message is raised when you are trying to iterate over an object that has a value of None, which is not iterable.

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).

This error is usually caused when you try to access an element in a list using a string as the index, rather than an integer.