Getting Started with Python: A 10-Minute Beginner-Friendly Guide

Posted by: XinYe 2 weeks, 1 day ago

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1. Getting Started Ideas

• It is not recommended to start with software installation or environment configuration. First use the Programming Paradise website (no need to configure the online environment, write code directly), log in by scanning the QR code, click on the Programming Paradise, Code Practice Ground, enter the code, select Python and other steps to start.

2. Basic operations

1. File naming and remarks :
   • Enter the file name and comments on the left. Complete this step and you will defeat 20% of people.
2. Code editing and running :
   • The right side is divided into upper and lower parts. The upper part is the code editing area. Click the Run button, and the code execution results will be displayed in the console area below.
   • For example, enter print hello world and execute it. The console will print out hello world . Completing this step will defeat 25% of people.

3. Variable definition

• Variable naming and assignment :
  • Give the variable a name and a meaningful value. For example, item = "banana" , here we come into contact with Python's first data type, string, which can be enclosed in double quotes or single quotes.
  • Python is case sensitive. If the variable name consists of multiple words, they are usually connected by underscores, for example, item_price = 5 .
  • When a variable is output, operations are performed based on the variable value. For example, "print hello + item" will perform string concatenation. Completing this step will defeat 30% of people.

4. Data type

1. String :
   • Text enclosed in quotes or double quotes, such as "orange", which is a string.
2. quantity :
   • For example, "5" is a numeric type.
3. Boolean type :
   • For example, is_happy = True indicates whether something is true or false, which will have important uses in the future. Completing the relevant operations can defeat 40% of people.
4. List :
   • Can be used to hold various elements such as fruits, list elements will be printed later.

5. Operation symbols and data type conversion

1. Operation symbol (+) :
   • The operator symbol "+" learned earlier is used to write examples, such as defining "item_price_string" as a string but looking like a number. Since Python has data types, the value data types of + before and after the connection must be consistent, so there are many ways to use built-in functions to convert data types. Complete this step and you can defeat 50% of the people.
   • Python's built-in functions are rich in functions, which you will gradually come into contact with in the future.

6. Mathematical calculations and logical statements

1. Mathematical calculations :
   • Relatively easy to understand. You can understand it by writing the code directly.
2. Logic statement (conditional control) :
   • First define a Boolean type variable to indicate whether something is true or false, such as is_happy = False , for conditional judgment. When a certain condition is met, the corresponding code is executed. Completing the relevant operations can defeat 55% of people.
   • The execution of control code can also be Boolean expressions, including greater than or less than conditions, juxtaposition using 'and' connection, etc., equal to indicates logical equivalence. Completing this step will defeat 65% of people.

7. Loop statement

1. for loop :
   • Can be used to perform repetitive tasks such as writing "I was wrong" for 10,000 words. After learning Python, you can easily complete it with a for loop, such as for i in range(10000): i is the current number of loops (starting from zero), you can use it as needed.
   • Lists are suitable for looping learning and presentations. For example, you can output the names of fruits one by one through a loop, or you can define the element names yourself. Complete this step and you'll beat 68% of people.
2. while loop :
   • It can be executed based on conditions, continuing when the condition is true, and interrupting when it is false.
   • Bounded loop example: "while i < 5:", loop when "i" is less than "5", and interrupt when it is not true.
   • Unbounded loop example: while True: means it is always true, but the loop interruption logic can be set internally. For example, if the user enters '0' and uses the 'break' keyword to break out of the loop, completing this step will defeat 80% of people.

8. Method

1. Built-in methods :
   • Such as print , int , range , input , etc. are all Python's own methods.
2. Customization method :
   • You can define your own method. For example, defining "def say_hello(name):" will output the statement "hello + name". When making a call, just "say_hello(ERIC)".
   • If you define multiple methods and don't know how to implement them, you can first write the pass keyword inside the method to avoid program errors, but you must come back later to implement the internal logic of the method, otherwise it may be difficult to locate. bug. Completing this step will defeat 85% of people.

9. Program exception handling

• The structure is try-except . Under try is the normal execution content, and under except is the program exception execution content. In order to make the program more interactive, you can give users reminders and prompts in except . Completing this step can defeat 90% of people.

10. Exercises and Advice

• Finally, a question is given to connect today's content: given a user password, let the user enter it three times. If the user enters correctly, he or she will be greeted. If the input is incorrect, the user will be prompted and the number of errors will be accumulated. If the user enters the wrong password 3 times, the program will terminate and output the wrong password. You can complete the exercises yourself and post the code in the comment area, and the author will comment. If you forget or don’t understand concepts while writing code, you can refer to White Paper Programming’s introductory Python course. The site is beginner-friendly and provides real-life examples.

11. Summary

• This video introduces Python to beginners in 10 minutes. It covers basic operations, variable definitions, data types, operation symbols, mathematical calculations, logical statements, loop statements, methods, exception handling, etc., and provides easy-to-understand guidance. Examples and exercises, and viewers are encouraged to share code and ask questions in the comments section.

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