How-to articles, tricks, and solutions about PYTHON

To get the number of elements in a list in Python, you can use the len() function.

To limit a float to two decimal points, you can use the round() function.

To print a curly brace character in a string that is being formatted with the .format() method, you will need to use double curly braces to escape the character.

You can use the random module's choice function to select a random element from a list.

You can use the hasattr function to check if an object has an attribute.

To import a module from a different folder in Python, you can use the sys.path.append() function to add the path to the folder containing the module to your Python path.

To call a function from a module by using its name as a string, you can use the importlib module.

To leave a Python virtual environment, you can use the deactivate command.

To print without a newline in Python, you can use the end argument for the print() function.

In Python, class variables are variables that are shared by all instances of a class.

You can use the lower() method to lowercase a string in Python.

To get a substring of a string in Python, you can use the string[start:end] notation.

You can use the pip freeze command to generate a requirements file that includes all of the current packages and their versions, and then use pip install -r to upgrade all packages to the latest available versions.

To sort a list of dictionaries by a value of the dictionary, you can use the sorted() function and specify the key parameter to be a lambda function that returns the value you want to sort by.

To get the last element of a list, you can use negative indexing.

To parse a string to a float or int in Python, you can use the float() and int() functions, respectively.

To check if a given key already exists in a dictionary, you can use the in keyword.

You can use the del statement to remove a key-value pair from a dictionary in Python.

To rename the column names of a Pandas DataFrame, you can use the DataFrame.rename() method.

To find the current directory in Python, you can use the following code:

The range() function generates a sequence of numbers, starting from the first argument, and ending before the second argument.

To convert the string "Jun 1 2005 1:33PM" into a datetime object, you can use the datetime module in the Python standard library.

You can use the os module in Python to access environment variables.

Here is a function that takes a list and an integer n and splits the list into n equally sized chunks:

You can use the termcolor module to print colored text to the terminal in Python.