Function summary

One , Definition

A function is a collection of function codes with names 》.
A piece of code or instruction used to explain a problem , Collection with name .## Two , Why use functions ：
Reduce code duplication .## 3、 ... and , Use of functions ：
1, The body of the function ,
2, Function gets a result , If the caller needs to return this def The name of the function （[ parameter list ])
Example ：def show(ls):
print()
Call of function ：
The name of the function （【 Actual parameters 】）
Example ：def insert (list)
insert(ls) ## Four , Classification of functions ：
1, With or without parameters
2, Is there a return value
Example ：def add(x,y)
return x+y
call ：
res=add(4,8)
print(" And is “,yes)
5、 ... and , Global function ：
To force modification of global functions , Use global Variable name declaration of .

python Of main function ： if name == ‘main’:
python It's a scripting language , So it's main Functions and c perhaps java Wait for something different
python Medium main Functions are not where the code starts , Written in main The code in the function is generally the test code , Used to test the current module
It cannot be imported into other modules. The default value parameters ： When the function is defined , If the values of some parameters , Generally, it is not invariable to a certain value , You can set this parameter as the default parameter , In this way, the trouble of the caller is reduced. The function is passed to the function as a parameter ：
python in , A function is essentially an object ,python in , The argument type of the function is python All types in

Conclusion

： stay python, Functions can be passed as arguments inside functions lambda expression ：
Be careful ： If you need to return a value , No need to add return, It will automatically come back lambda [ parameter list ]: The body of the function
*

lambda effect ： advantage ：

1、 stay python Implement anonymous functions
2、 Simplified programming shortcoming ：
shortcoming
Reduced the readability of the code , Increase the complexity of the code , It improves the partial function of code maintenance cost ：
Partial function definition ： Modify or increase the default value of a function parameter , It is called partial function ## arge Variable function
The problem of passing a function as a parameter to the inside of a function ：
fn( ）
The function itself can be used as an argument ( Characteristics of weak data types ）.## One , Definition
A function is a collection of function codes with names 》.
A piece of code or instruction used to explain a problem , Collection with name .

Two , Why use functions

：
Reduce code duplication .

3、 ... and , Use of functions ：

1, The body of the function ,
2, Function gets a result , If the caller needs to return this

def The name of the function （[ parameter list ])
Example ：def show(ls):
print()
Call of function ：
The name of the function （【 Actual parameters 】）
Example ：def insert (list)
insert(ls)

Four , Classification of functions

：
1, With or without parameters
2, Is there a return value
Example ：def add(x,y)
return x+y
call ：
res=add(4,8)
print(" And is “,yes)
5、 ... and , Global function ：
To force modification of global functions , Use global Variable name declaration of .

python Of main function ：

f name == ‘main’:
# python It's a scripting language , So it's main Functions and c perhaps java Wait for something different
# python Medium main Functions are not where the code starts , Written in main The code in the function is generally the test code , Used to test the current module
# It cannot be imported into other modules. The default value parameters ： When the function is defined , If the values of some parameters , Generally, it is not invariable to a certain value , You can set this parameter as the default parameter , This reduces the trouble of the caller

The problem of passing a function as a parameter to the inside of a function ：
python in , A function is essentially an object ,python in , The argument type of the function is python All types in
Conclusion ： stay python, Functions can be passed as arguments inside functions lambda expression ：
# Be careful ： If you need to return a value , No need to add return, It will automatically come back lambda [ parameter list ]: The body of the function

lambda effect ：

advantage ：
1、 stay python Implement anonymous functions
2、 Simplified programming shortcoming ：

shortcoming
Reduced the readability of the code , Increase the complexity of the code , It improves the partial function of code maintenance cost ：
Partial function definition ： Modify or increase the default value of a function parameter , It is called partial function

arge Variable function

The problem of passing a function as a parameter to the inside of a function ：
fn( ）
The function itself can be used as an argument ( Characteristics of weak data types ）.