56 Python One-Liners to Impress Your Friends

This is a running document in which I’ll answer all questions regarding the single line of Python code. It’s based on my interactive collection here but without the slow videos and embedded code shells. Let’s get started! Python One Line If Else You can use a simple if statement in a single line of code. … Read more

Accessing The Index Of Iterables In Python

Summary: To access the index of iterables like lists in Python, use one of the following methods: Use enumerate() function. Use a counter variable with For Loop/While Loop. Use a list comprehension. Use the NumPy library. Use the itertools module. Introduction An index can be considered as the position of an element in an ordered … Read more

Python One Line Dictionary

Python’s dictionary data structure is one of the most powerful, most underutilized data structures in Python. Why? Because checking membership is more efficient for dictionaries than for lists, while accessing elements is easier for dictionaries than for sets. In this tutorial, you’ll learn how to perform four common dictionary operations in one line of Python … Read more

Python One Line For Loop Append

Problem: How to append elements to a list using a single line for loop? Example: You hope to accomplish something like this where you create an initial list (this one is empty) and you append multiple elements to it: However, this statement doesn’t work! Is there a one-line for loop to append elements to a … Read more

Python Unicode Encode Error

Summary: The UnicodeEncodeError generally occurs while encoding a Unicode string into a certain coding. Only a limited number of Unicode characters are mapped to strings. Thus, any character that is not-represented / mapped will cause the encoding to fail and raise UnicodeEncodeError. To avoid this error use the encode(utf-8) and decode(utf-8) functions accordingly in your … Read more

Python Dictionary Comprehension: A Powerful One-Liner Tutorial

Dictionary Comprehension is a concise and memory-efficient way to create and initialize dictionaries in one line of Python code. It consists of two parts: expression and context. The expression defines how to map keys to values. The context loops over an iterable using a single-line for loop and defines which (key,value) pairs to include in … Read more

[Dash + Flask] How to Deploy a Python Dash App on Pythonanywhere.com

Here’s the step-by-step approach of how to deploy your Dash app on Pythonanywhere.com using Flask and pip: Create an account on Pythonanywhere.com. Create a Flask application. Create a Dash application. Copy the Dash app into the Flask app. Connect the Flask server with the Dash app. Modify the WSGI configuration file. Install Dash with pip … Read more

Python One-Line Password Generator

Can you believe it? People use unknown and potentially insecure websites to generate their random passwords! This works as follows: A website generates a “random” password for them and they copy&paste it and assume this is a safe password because of the randomness of the characters. What a security flaw! Why? Because the website could … Read more

How to Solve Python “TypeError: β€˜int’ object is not iterable”?

It’s quite common for your code to throw a typeerror, especially if you’re just starting out with Python. The reason for this is that the interpreter expects variables of certain types in certain places in the code. We’ll look at a specific example of such an error: “typeerror: ‘int’ object is not iterable”. Exercise: Run … Read more

String Formatting Comparison: format() | Percent | f-string

Summary: f-string is more readable and easier to implement than % and .format() string formatting styles. Furthermore, using f-strings is suggested for Python 3.6 and above while .format() is best suited for Python 2.6 and above. Versions prior to Python 2.6 only provide % option for string formatting. In terms of speed, % is the … Read more

Python One Line Generator

A generator function is a Pythonic way to create an iterable without explicitly storing it in memory. This reduces memory usage of your code without incurring any additional costs. The following code shows a function get_numbers(n) that returns a list of n random numbers. However, this is not very efficient code because you create a … Read more