Python · Theory

def Function in Python

Theory

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def Function in Python

def is the keyword that creates a named function. Shape: def total(a, b): return a + b. Colon, indented body. Optional docstring on the first line inside. Functions are objects — you can pass them to sorted(key=...) or store them. Without return, the caller gets None.

def vs lambda: def has a clear name and can have many lines. lambda is one expression. Freshers should live in def until the key= case appears.

def Function in Python — output — Hi Asha. def builds greet; the call runs it.

Diagram

def square(n):
      return n * n
         │ square(5)
         ▼
        25

Exam tip

def vs lambda: named reusable vs tiny expression.

Example

# def
def greet(name):
    return "Hi " + name

print(greet("Asha"))

def Function in Python — output: Hi Asha. def builds greet; the call runs it.

Short notes

Defdef creates a named function.
RuleIndented body + return.
Difflambda is tiny and unnamed.

Python · Theory

def Function in Python

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Theory

45/268

def Function in Python

def vs lambda: def has a clear name and can have many lines. lambda is one expression. Freshers should live in def until the key= case appears.

def Function in Python — output — Hi Asha. def builds greet; the call runs it.

Diagram

def square(n):
      return n * n
         │ square(5)
         ▼
        25

Exam tip

def vs lambda: named reusable vs tiny expression.

Example

# def
def greet(name):
    return "Hi " + name

print(greet("Asha"))

def Function in Python — output: Hi Asha. def builds greet; the call runs it.

Short notes

Defdef creates a named function.
RuleIndented body + return.
Difflambda is tiny and unnamed.

def Function in Python

Example

Short notes

Questions

def Function in Python

Example

Short notes

Questions