Tenth, Python function argument assignment order

FIX: Problem with function call assignment order

01, usually one by one corresponding assignment (with predefined values can not be assigned value)-------recommended ******

02, parameter one by one assignment can be specified

03, a parameter with a predefined value cannot take precedence over a parameter that has no pre-defined value assigned

Note: 01 in the case of a call, do not write the parameter name.

02 in the case of a call, specify: Parameter name = value (all the visible parameters are indicated)

EG1:

def test_e (n1,n2,n3=15):
N=n1+n2+n3
return n

01 corresponding Calling Method: S=test_e (4,1) n3=15

S=test_e (4,1,12) n3=12

02 corresponding Calling Method: S=test_e (4,n2=1) n3=15

S=test_e (4,n2=1,n3=12)

S=test_e (n2=1,n1=4) n3=15

03 corresponding Call Method: S=test_e (n3=14,n2=1,n1=4)----OK

S=test_e (n3=14,n2=1,4)--------No

S=test_e (n3=14,1,4)-----------No

Reason for two No in 03: parameters that have predefined values cannot be assigned precedence over parameters that do not have predefined values.

S=test_e (4,n1=1)--------------No

Cause: 4 is assigned to N1 by default, N1 cannot be assigned repeatedly

S=test_e (4,1,n3=15)-----------OK

Tenth Python function argument assignment order