Python format string formatting, mathematical meaning functions and functions in Python day14

Format string formatted, must be one by one corresponding

' I am {}, age{},{} '. Format ('seven',',') print (TPL)

' I am {1}, age{2},{2} '. Format ('seven',',') print (TPL)

Take a tuple first

TPL = ' I am {0[0]} ', Format ([1,2,3],[123])

function definition methods in Python:

def Test (x):     ' The function Definitions ' #注释函数    x+ =1    return X

def: A keyword that defines a function

Test: Name of function

(): Internal Medicine defined formal parameters

' Document description, not necessary, strongly recommended to add

X+=1: Generic code block or program processing logic

Return: Define the return value

Using functions

def Test (x):     ' :p Aram X: Shaping numbers ' #注释函数    y=2*x+1    return  = Test (3) print (a)

No return value, none returned

There is only one return value, which returns the value

Returns a tuple with multiple return values

Parameters of the function

parameters, which are useful only if the function is called

arguments, always present

Formal parameter, argument one by one corresponds

def text (x, y):    res=x*y    return= text (1,2) print ( Z)

Parameter Group * * Dictionary * list

def text (x,*y):    print (x)    print (y) c= text (1,2,3,4, 5)

Python format string formatting, mathematical meaning functions and functions in Python day14