7.1 Functions- Definition and Types of Function
Duration: 6 min
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This video is a Python programming lecture that introduces the concept of functions. The instructor begins by defining a function as a group of statements executed when called. The main content is presented on a slide with a table comparing 'In-built Function Examples' and 'User Defined Function Example'. The instructor explains the syntax for defining a user-defined function using the 'def' keyword, as shown in the code snippet 'Def power(x,y):'. He demonstrates how to call this function with arguments, using the example 'power(x,y)'. The lecture then transitions to a new slide titled 'Function Types', which categorizes functions into 'In-built or pre-defined function' and 'User defined function'. Finally, a slide on 'In-built Functions' lists common functions like 'Print()', 'Len()', and 'Find()' under categories such as General, String, List, and Dictionary. The instructor uses a digital pen to write on the screen, adding annotations like 'len(Name)' and 'x=10, y=20' to illustrate the examples.
Chapters
0:00 – 2:00 00:00-02:00
The video opens with a title slide for a Python lecture, showing the Python logo and the word 'Function'. The instructor, a man in a black polo shirt, stands in front of a digital screen. The slide defines a function as 'A group of statements which are executed when it is called.' The main content is a table with two columns: 'In-built Function Examples' and 'User Defined Function Example'. The instructor begins to explain the concept of a function, referencing the definition on the slide. He gestures towards the screen, which displays code snippets for both types of functions, including a user-defined function 'Def power(x,y):' and examples of in-built functions like 'print(len(Name))'.
2:00 – 5:00 02:00-05:00
The instructor continues to explain the user-defined function example on the right side of the slide. He uses a digital pen to write on the screen, adding annotations to clarify the code. He writes 'len(Name)' in pink to highlight the use of the built-in len() function. He then writes 'x=10' and 'y=20' to demonstrate how to assign values to variables before calling the function. He circles the function call 'power(x,y)' and explains that this is how the function is executed. The instructor emphasizes the structure of a function, including the 'def' keyword, the function name, parameters in parentheses, and the body of the function indented below. He also points out the 'input()' function used to get user input for the two numbers.
5:00 – 5:31 05:00-05:31
The video transitions to a new slide titled 'Function Types'. The instructor explains that in Python, there are two types of functions: 'In-built or pre-defined function' and 'User defined function', which are shown in a diagram. He then moves to the next slide, 'In-built Functions', which displays a table with functions categorized by data type: General, String, List, and Dictionary. The instructor points to the table, listing examples like 'Print()', 'Len()', 'Find()', and 'Clear()'. The video ends with the instructor saying 'Thank you' as the screen shows the 'Knowledge Gate' logo.
The lecture provides a structured introduction to Python functions, starting with a general definition and progressing to specific examples. It effectively uses a visual aid with a table to contrast built-in functions with user-defined ones, making the distinction clear. The instructor's use of a digital pen to annotate the code live enhances the learning experience by highlighting key parts of the syntax and execution flow. The lesson concludes by categorizing functions into two main types, setting the stage for further exploration of Python's built-in functionalities.