#  created : 20250321

#  https://www.scientecheasy.com/2022/12/arguments-in-python.html/

# Default Arguments in Python

def studentInfo(name, gender = 'Male'):
# This function displays the student's info passed in the function parameters.
    print('Name:',name)
    print('Gender:',gender)

# Main program.
# Function call 1.
studentInfo('Deepak')
# Function call 2.
studentInfo('Tripti', gender = 'Female')

Name: Deepak
Gender: Male
Name: Tripti
Gender: Female

def studentInfo(name, rollNo = 20, branch = 'Electrical'):
    print('Name:',name,'Roll no:',rollNo,'Branch:',branch)

# Main program.
# Function call 1.
studentInfo(name = 'John')
# Function call 2.
studentInfo(name = 'Bob', rollNo = 10)
# Function call 3.
studentInfo(name = 'Jenny', rollNo = 5, branch = 'Computer Science')

Name: John Roll no: 20 Branch: Electrical
Name: Bob Roll no: 10 Branch: Electrical
Name: Jenny Roll no: 5 Branch: Computer Science

# Required Arguments in Python

# example error code

# Program to find the area and perimeter of rectangle using function required arguments.
def rectangle(length, breadth):
    areaRec = length * breadth # Area of rectangle.
    perRec = 2 * (length + breadth) # Perimeter of rectangle.
    print("Area of rectangle = ",areaRec)
    print("Perimeter of rectangle = ",perRec)

# Main program.
def main():
    ln = int(input("Enter the length of rectangle: "))
    br = int(input("Enter the breadth of rectangle: "))
    rectangle(ln) # Intentionaly missing one argument value.

main() # function calling.

Enter the length of rectangle:  20
Enter the breadth of rectangle:  20



---------------------------------------------------------------------------

TypeError                                 Traceback (most recent call last)

Cell In[16], line 1
----> 1 main() # function calling.


Cell In[15], line 5, in main()
      3 ln = int(input("Enter the length of rectangle: "))
      4 br = int(input("Enter the breadth of rectangle: "))
----> 5 rectangle(ln)


TypeError: rectangle() missing 1 required positional argument: 'breadth'

# Keyword Arguments in Python

# Displaying persons info.
def display(name, age, gender):
    print('Name:',name)
    print('Age:',age)
    print('Gender:',gender)

def main():
 # First function call.
    display('John', 20, 'M') # function calling from another function.
 # Second function call.
    display('Jenny', 18, 'F')

main() # function calling.

Name: John
Age: 20
Gender: M
Name: Jenny
Age: 18
Gender: F

# Displaying persons info.
def display(name, age, gender):
    print('Name:',name)
    print('Age:',age)
    print('Gender:',gender)
def main():
  # First function call.
    display('Herry', age = 20, gender = 'M') # function calling from another function.
  # Second function call.
    display(age = 18, gender = 'F', name = 'Jimmy')
main() # function calling.

Name: Herry
Age: 20
Gender: M
Name: Jimmy
Age: 18
Gender: F

# Variable length Arguments

def my_function(*args): # args is the name of variable length parameters.
    "function docstring"
    # body of the function
    return [expression]

# Example 1:

# Function definition with variable length parameters. 
def my_function(*args): # Here, args is name of formal parameter.
    print(args)
print('Calling function with two arguments')
my_function(10, 20)

print('Calling function with three arguments')
my_function(10, 20, 30)
print('Calling function with four arguments')
my_function(20, 30, 40, 50)

Calling function with two arguments
(10, 20)
Calling function with three arguments
(10, 20, 30)
Calling function with four arguments
(20, 30, 40, 50)

# Function definition with one formal parameter and variable length parameters.
def listDay(arg1, *arg2):
    print(arg1, arg2, sep="")
def main():
    listDay('Name of days are:', 'Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday')
main() # function calling.

Name of days are:('Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday')