Function is a program in a program can be used repeatedly.
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Ordinary function
- Function name (required)
- Parameters: parameter (formal parameters, when defined), arguments (actual parameters, call time)
- Statement block (Required)
- return
- variable
Can perform print directly, no return value. Running may be the results returned using a block of statements return.
def learn_python(location):
print("我正在{}上学Python".format(location)) #语句块
def learn_python(location):
doing = ("我正在{}上学Python".format(location))
return doing
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Anonymous function
Function without a name, which is omitted from the process of def-defined functions.
lambda is just an expression, not a function of the body, using lambda as follows:
lambda arg1，arg2，arg3，...: expression #arg1，arg2，arg3表示具体参数，expression表示参数要执行的操作
f = lambda x,y:x+y
f(1,2)
3
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supplement:
Keyword arguments : next to the name of a parameter defined on it saysome (words = 'make love to change the world', name = 'Luoying Xi')
The default parameters : define the parameter default values
Collection parameters : in the end is not clear how many parameters to, preceded by a *****
Functions and procedures:
Function - returns a value returned by default tuples
process - none Return value
Global and local variables : the entire code which are accessible get, do not try to modify it within a function, you can go to access its value inside the function, Python will create a local variable inside a identical in function to replace it .
Have to change, then use the global keyword.
def MyFun(): global count
count = 10
print(count)
