How-to articles, tricks, and solutions about PYTHON

This error message is indicating that a method or function called "method" is expecting one argument, but it was called with two arguments.

This error message is indicating that a class method is being called without providing the "self" parameter, which is the first parameter for all class methods and refers to the instance of the class.

The super() function is a way to refer to the parent class and its attributes.

In Python, slicing refers to taking a subset of a sequence (such as a list, string, or tuple) by using indices to specify the start and end points of the slice.

To read a file in Unicode (UTF-8) encoding in Python, you can use the built-in open() function, specifying the encoding as "utf-8".

Here is an example of a Python code snippet that could cause a UnicodeDecodeError: invalid continuation byte error:

This error occurs when trying to decode a string using the 'charmap' codec, which is typically used for Windows-1252 character encoding.

This error occurs when a file or string that is being decoded using the UTF-8 encoding contains an invalid byte sequence.

This error occurs when trying to decode a byte string using the UTF-8 codec and the byte at the given position is not a valid start byte for a UTF-8 encoded character.

This error is raised when trying to encode a Unicode string using the ASCII codec, and the string contains a character that is not within the ASCII range (0-127).

Here is a code snippet that demonstrates how to unzip a file using the zipfile module in Python:

__slots__ is a way to specify a fixed set of attributes for a class, which can help to save memory in certain situations.

You can use the .loc property of a Pandas dataframe to select rows based on a list of values.

To use a different Python version with virtualenv, follow these steps:

In Python, *args and **kwargs are special keywords that allow you to pass a variable number of arguments to a function.

In Python, you can use global variables in a function by declaring the variable as global within the function.

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

This error message is indicating that the program is trying to convert a string to a float, but the string is not a valid number.

In this code snippet, the variable "value" is being set to the integer representation of the string "invalid." However, "invalid" is not a valid integer, so the int() function will raise a ValueError.

This code creates a 2D numpy array, and then tries to set the first element of the array to a list.

This error message is indicating that a boolean operation was performed on an array with multiple elements, and the result of the operation is ambiguous.

"Named tuples" in Python are a subclass of the built-in tuple type, but with the added ability to access elements by name rather than just by index.

In Python, a metaclass is a class that defines the behavior of a class. When you create a class, Python automatically creates a metaclass for you behind the scenes. You can think of a metaclass as a blueprint for creating a class.

urllib, urllib2, and urllib3 are all Python standard library modules for handling URLs.

In Python, type() is a built-in function that returns the type of an object, while isinstance() is a function that checks whether an object is an instance of a particular class or of a subclass thereof.