English language mdhe answers pahije

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:

# '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.