One Pager Cheat Sheet

• This tutorial provides an introduction to installing and working with Python, with a focus on the key points of installation and setup, and an overview of some of its basic features.
• To download and install Python free of charge on your operating system, you can visit the official website here.
• Python is a free and open-source programming language that is accessible and popular for a variety of purposes.
• Python programming is easy to understand due to its simple syntax resembling the English language.
• Number objects of the int, float, complex, and bool data types can all be considered numbers in Python.
• By creating functions and reusing them, we can modularize our code to make program execution more efficient.
• The definition is invalid because it does not include the keyword def, the function name within parenthesis with the parameters, a colon and an indented code block for the function body.
• Lists in Python are powerful data structures, allowing us to store multiple values of different data types in a single variable and perform operations on them using indexing and list methods.
• Dictionaries in Python are an efficient way to store key: value pairs of data, particularly for representing data where keys need to be associated with particular values.
• Dictionaries have methods, such as keys(), values(), items(), and get(), to help them be manipulated in a program.
• By opening, reading and closing a file in Python, you can easily manipulate data from the file within your program.
• The open() function in Python can be used to open a file, with the name specified in a string within the parenthesis, in either reading or writing mode.
• We can append to a file to avoid overwriting any previous information.
• Be sure to specify the file path correctly while opening files and ensure they are in the correct directory.
• The in operator and the values() method can be used to check if the value 42 exists in the employees dictionary.
• Yes, the given open() and read(n) function is correct and should successfully read the first n characters of the file filename.txt.