Parameters & Arguments in Python

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You can set parameters and arguments for a function as shown below:

Parameters:

*Memos:

A parameter can have a default value.
All the parameters after the parameter which has a default value must have default values.
A f…


This content originally appeared on DEV Community and was authored by Super Kai (Kazuya Ito)

Buy Me a Coffee☕

You can set parameters and arguments for a function as shown below:

Parameters:

*Memos:

  • A parameter can have a default value.
  • All the parameters after the parameter which has a default value must have default values.
  • A function cannot have multiple same name parameters. 
def func(fname, lname, age, gender): pass

def func(fname="John", lname="Smith", age=36, gender="Male"): pass

def func(fname, lname, age=36, gender="Male"): pass

def func(fname="John", lname="Smith", 36, "Male"): pass
# SyntaxError: invalid syntax

def func(fname, lname, age, gender, lname): pass
# SyntaxError: duplicate argument 'lname' in function definition

Arguments:

*Memos:

  • An argument can have a keyword.
  • All the arguments after the argument which has a keyword must have keywords.
  • There cannot be multiple same name arguments 
def func(fname, lname, age, gender):
    print(fname, lname, age, gender)

func("John", "Smith", 36, "Male")                        
func(fname="John", lname="Smith", age=36, gender="Male")
func(age=36, lname="Smith", gender="Male",  fname="John")
func("John", "Smith", age=36, gender="Male")
# John Smith 36 Male

func(fname="John", lname="Smith", 36, "Male")
# SyntaxError: positional argument follows keyword argument

func(36, "Smith", age=36, fname="John")
# TypeError: func() got multiple values for argument 'fname'

func(lname="Smith", lname="Brown", age=36, gender="Male")
# SyntaxError: keyword argument repeated: lname

def func(fname="John", lname="Smith", age=36, gender="Male"):
    print(fname, lname, age, gender)

func()
# John Smith 36 Male

func("Tom", "Brown")
# Tom Brown 36 Male

func(gender="Female", fname="Anna")
# Anna Smith 36 Female


This content originally appeared on DEV Community and was authored by Super Kai (Kazuya Ito)


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