How-to articles, tricks, and solutions about PYTHON
To apply a function to two columns of a Pandas DataFrame, you can use the apply() method of the DataFrame and pass the function as an argument.
Threading is a way to run multiple threads (smaller units of a program) concurrently, in the same process.
In a Python format string, the %s placeholder represents a string.
To check the size of a file in Python, you can use the os module to get the size of the file in bytes.
In matplotlib, the legend function allows you to specify the location of the legend.
The error: Unable to find vcvarsall.bat message is usually raised when you are trying to install a Python package that requires a C compiler, and the compiler is not installed or cannot be found by Python.
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.
To list all functions in a module, you can use the dir() function to get a list of all the names defined in the module, and then use the inspect module to check if each name is a function.
You can use the os module to check if a directory exists.
To ask the user for input and repeat the prompt until they give a valid response, you can use a while loop and use a try-except block to catch any errors that may occur when trying to convert the user input to the desired data type.
To sort a Pandas DataFrame based on the values in a column, you can use the sort_values() method of the DataFrame.
To change the order of columns in a Pandas DataFrame, you can use the DataFrame's "reindex" method and specify the new order of the columns.
The "SyntaxError: Missing parentheses in call to 'print'" error message is raised when you are using Python 3 and you have forgotten to include the parentheses when calling the print() function.
To remove a substring from the end of a string, you can use the rsplit() method and specify the substring as the delimiter.
It looks like you are trying to import the urllib2 module, which is not available in Python 3.
To convert a column in a Pandas DataFrame to a datetime data type, you can use the pandas.to_datetime() function.
You can use the glob.glob() function from the glob module to search for files recursively.
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.
You can use the isnan() function provided by the math module to check if a value is NaN.
To create a dictionary using comprehension in Python, you can use the following syntax:
Here is an example of using an if/else statement in a list comprehension in Python:
To flush the output of the print function, you can use the flush parameter of the print function.
In Python, *args and **kwargs are special keywords that allow you to pass a variable number of arguments to a function.
A singleton is a design pattern that allows you to ensure that a class has only one instance.