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Okay, I will provide answers in English. Identifiers in Python are names used to identify unique entities in a program. These entities can be variables, functions, classes, modules, or other objects. Here are the rules for naming identifiers in Python: 1. Allowed Characters: Identifiers can consist of letters (a-z, A-Z), digits (0-9), and the underscore (\_). 2. Starting Character: An identifier must begin with a letter (a-z, A-Z) or an underscore (\_). It cannot start with a digit. 3. Case Sensitivity: Python is case-sensitive, meaning myVariable and myvariable are treated as two distinct identifiers. 4. Reserved Words: Python's reserved words (keywords) cannot be used as identifiers. Examples include if, else, while, for, def, class, etc. Example: Let's say we want to create a variable to store a student's roll number. Valid Identifiers: student_roll_number rollNumber123 _internal_var Invalid Identifiers: 123rollNumber (Starts with a digit) student-roll-number (Hyphens are not allowed) for (This is a reserved keyword) Here's how you might use identifiers in Python: `python 'student_name' is an identifier for a string variable student_name = "Alice" 'student_age' is an identifier for an integer variable student_age = 21 'calculate_average' is an identifier for a function def calculate_average(marks): total_marks = sum(marks) average = total_marks / len(marks) return average 'marks_list' is an identifier for a list marks_list = [88, 95, 79, 91] Calling the function avg_marks = calculate_average(marks_list) print(f"Student Name: student_name") print(f"Student Age: student_age") print(f"Average Marks: avg_marks") ` In this example, student_name, student_age, calculate_average, marks, total_marks, average, and marks_list are all identifiers in Python. Send the next one 📸