Table of contents
1.1 Formal parameters and actual parameters
1.2.1 Utilizing location transfer
1.2.3 Set the default value of actual parameters
1.2.4 Function definition of unknown face with quantitative parameters
2.2 Import the specified function from
1. Define function
def function_name(parameter):
do sth
>>function(1)1.1 Formal parameters and actual parameters
Formal parameter: parameter
for function definition
Actual parameter: argument
for function calls
1.2 Pass parameters
When calling a function, each actual parameter must be passed to the corresponding formal parameter.
1.2.1 Utilizing location transfer
def fun(per1,per2):
do sth
argu1=1
argu2=2
fun(argu1,argu2)1.2.2 Use keyword delivery
No need to consider the order
def fun(per1,per2):
do sth
argu1=1
argu2=2
fun(per1=argu1,per2=argu2)1.2.3 Set the default value of actual parameters
When no actual parameters are entered, the default value is called
def fun(per1=0,per2='sb'):
do sth1.2.4 Function definition of unknown face with quantitative parameters
def fun1(*per):
do sth.
def fun2(**per):
do sth.*Formal parameters: Encapsulate the input actual parameters into a tuple
* *Formal parameters: Encapsulate the input keyword actual parameters into a dictionary
Combining the above knowledge points can prevent errors caused by too many actual parameters.
1.2 Return value
return sth
Can return any kind of value
2. Module
Encapsulate the code segment into a module and save it in the module_name.py file
2.1 Import module import
import file_name2.2 Import the specified function from
from module_name import function_name1,function_name2Import all functions
from module_name import *2.3 Function alias as
from module_name import function_name as name1