Python Functions - Arguments

Introduction

• Lecture presented by 720 on Python functions and arguments.

Types of Arguments

1. Formal Arguments: Variables defined in a function.
2. Actual Arguments: Values passed to the function during a call.

Example: Adding Two Numbers

• Function definition:

  def sum(a, b):
      c = a + b
      print(c)
  

• To call the function: sum(5, 6) - Must pass two values, otherwise an error occurs.

Four Types of Actual Arguments

1. Positional Arguments

   • Arguments assigned based on the position in the function call.
   • Example:

     def person(name, age):
         print(name, age)
     person('Naveen', 28)
     

   • Order matters; if switched, results can be incorrect.

2. Keyword Arguments

   • Specify the argument names in the function call, eliminating order issues.
   • Example:

     person(age=28, name='Naveen')
     

3. Default Arguments

   • Assign default values if no argument is passed.
   • Example:

     def person(name, age=18):
         print(name, age)
     person('Naveen')  # Outputs 'Naveen 18'
     

4. Variable Length Arguments

   • Allows passing a varying number of arguments.
   • Use *args to accept multiple values.
   • Example:

     def add(*args):
         total = 0
         for num in args:
             total += num
         print(total)
     add(5, 6, 7, 8)  # Outputs '26'
     

Summary

• Discussed various types of function arguments: positional, keyword, default, and variable length.
• Understanding how to properly utilize these arguments is crucial for effective function usage in Python.

Conclusion

• Engage with the content by asking questions in the comments.
• Reminder to practice these types of arguments for better mastery of Python functions.

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