A function is a block of code which only runs when it is called. You can pass data, known as parameters, into a function. A function can return data as a result.

Definition and Usage The write() method writes a specified text to the file. Where the specified text will be inserted depends on the file mode and stream position. "a": The text will be inserted at the current file stream position, default at the end of the file.

Execute Python Syntax As we learned in the previous page, Python syntax can be executed by writing directly in the Command Line:

Create a New File To create a new file in Python, use the open() method, with one of the following parameters: "x" - Create - will create a file, returns an error if the file exists "a" - Append - will create a file if the specified file does not exists "w" - Write - …

Learning by Examples With our "Try it Yourself" editor, you can edit Python code and view the result.

A lambda function is a small anonymous function. A lambda function can take any number of arguments, but can only have one expression.

To loop through a set of code a specified number of times, we can use the range () function, The range () function returns a sequence of numbers, starting from 0 by default, and increments by 1 (by default), and ends at a specified number.

Python Conditions and If statements Python supports the usual logical conditions from mathematics: Equals: a == b Not Equals: a != b Less than: a < b Less than or equal to: a <= b Greater than: a > b Greater than or equal to: a >= b These conditions can be used in several ways, most commonly in "if statements" and loops.

Python also has many built-in functions that return a boolean value, like the isinstance() function, which can be used to determine if an object is of a certain data type:

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