Functions:
- Functions in Python are blocks of code that perform a specific task.
- They help us avoid repeating code and make programs easier to read and maintain.
Functions with parameter:
A function that takes input values (parameters).
Ex:
def greet(name):
print("Hello", name)
greet("Sakthi")
Function Without Parameters:
- A function that doesn’t take any input. Ex:
def greet():
print("Hello, welcome to Python!")
greet()
Function With Return Value:
- A function can return a result using the return keyword. Ex:
def add(a, b):
return a + b
result = add(5, 3)
print("Sum is:", result)
Function With Optional Parameter
- We can give parameters a default value. If no value is passed, the default is used. Ex:
def greet(name="Guest"):
print("Hello", name)
greet("Sakthi")
greet()
Function With Variable Length Parameters
- Sometimes we don’t know how many arguments will be passed. We can use (*args)
def numbers(*args):
total = 0
for num in args:
total += num
print("Sum is:", total)
numbers(1, 2, 3, 4, 5)
Practice problems:
data = "John,30,40,50,60\nDave,10,20,30,45,50\nAdam,40,95,87,67,50"
total, pass / fail, average, rank
data = "John,30,40,50,60,70\nDave,10,20,30,45,50\nAdam,40,95,87,67,50"
students = data.split("\n")
for std in students:
record = std.split(",")
name = record[0]
total = 0
result = "Pass"
for i in range(1, len(record)):
mark = int(record[i])
total += mark
if mark < 36:
result = "Fail"
avg = total / 5
record.append(total)
record.append(avg)
record.append(result)
print(record)
Calculator with variable length arguments, and return values
def add(*args):
total = 0
for i in args:
total = total + i
return total
def sub(*args):
total = args[0]
for i in range(1, len(args)):
total = total - args[i]
return total
def mul(*args):
total = 1
for i in range(1, len(args)):
total = total * args[i]
return total
def div(*args):
total = args[0]
for i in range(1, len(args)):
total = total / args[i]
return total
def floor_div(*args):
total = args[0]
for i in range(1, len(args)):
total = total // args[i]
return total
def mod(*args):
total = args[0]
for i in range(1, len(args)):
total = total % args[i]
return total
def power(*args):
total = args[0]
for i in range(1, len(args)):
total = total ** args[i]
return total
print("Addition:", add(1, 2, 3, 4))
print("Subtraction:", sub(10, 2, 3))
print("Multiplication:", mul(2, 3, 4))
print("Division:", div(100, 2, 5))
print("Floor Division:", floor_div(100, 3, 2))
print("Modulus:", mod(10, 3))
print("Power:", power(2, 3, 2))