ChrisProblem Formulation: Given a float number. How to convert it to octal representation? Examples: Consider the following desired conversions from float decimal numbers to their converted float octal numbers. input: 3.14 output: 3.1075 input: 0.01 output: 0.005 input: 12.325 output: 14.246 You can play with some examples here: Solution: The following code function float_to_octal() takes … Read more
Python’s built-in open() function opens a file and returns a file object. The only non-optional argument is a filename as a string of the file to be opened. You can use the file object to access the file content. For example, file_obj.readlines() reads all lines of such a file object. Here’s a minimal example of … Read more
Python’s built-in super() method returns a temporary object of the superclass to help you access its methods. Its purpose is to avoid using the base class name explicitly. It also enables your class to inherit from multiple base classes. Visual Idea super() The idea is simple: use super() to call the methods defined in the … Read more
Problem Formulation: Compare RPM Versions in Python Given two lists of strings that are the RPM versions currently installed on your computer and the versions in a repository or another environment. How to compare those lists to find the RPMs that are out of date? Example: Our goal is to determine a list of packages … Read more
Python’s built-in input() function reads a string from the standard input. The function blocks until such input becomes available and the user hits ENTER. You can add an optional prompt string as an argument to print a custom string to the standard output without a trailing newline character to tell the user that your program … Read more
The Python memoryview(arg) function returns a memoryview object of the given bytes or bytearray argument. This exposes the argument’s internal data (buffers) to help you access the data without intermediate copying. Syntax: memoryview(object) Arguments object Bytes or Bytearray object for which the memoryview should be returned Return Value memoryview Returns memoryview of the object. Python … Read more
Don’t leave for your next coffee break until you have glanced over this collection of 101 awesome, geeky nerd jokes.
Python’s built-in hash(object) function takes one object as an argument and returns its hash value. As the hash value is calculated based on the object’s data, two different but equal objects must have the same hash value. It doesn’t follow, though, that two objects with the same hash value are equal—they can have the same … Read more
Python’s built-in hex(integer) function takes one integer argument and returns a hexadecimal string with prefix “0x”. If you call hex(x) on a non-integer x, it must define the __index__() method that returns an integer associated to x. Otherwise, it’ll throw a TypeError: object cannot be interpreted as an integer. Argument integer An integer value or … Read more
Python’s built-in oct(integer) function takes one integer argument and returns an octal string with prefix “0o”. If you call oct(x) on a non-integer x, it must define the __index__() method that returns an integer associated to x. Otherwise, it’ll throw a TypeError: object cannot be interpreted as an integer. Argument integer An integer value or … Read more
The np.arange() function appears in 21% of the 35 million Github repositories that use the NumPy library! This illustrated tutorial shows you the ins and outs of the NumPy arange function. So let’s get started! What’s the NumPy Arange Function? The np.arange([start,] stop[, step]) function creates a new NumPy array with evenly-spaced integers between start … Read more
Problem Formulation: How to plot the confidence interval in Python? To plot a filled interval with the width ci and interval boundaries from y-ci to y+ci around function values y, use the plt.fill_between(x, (y-ci), (y+ci), color=’blue’, alpha=0.1) function call on the Matplotlib plt module. The first argument x defines the x values of the filled … Read more