2.3.2 Operator Precedence

1, what is the priority of Python 2, Python priority use combat

The role of priority

The execution of a program or operator in Python is sequential, such as A and B, and if a can take precedence over B, then the priority of a is higher than B, and B has a lower priority than a. Where A and B can be operators or programs. That is, there are two types of precedence in Python, one is the priority between programs, and one is the precedence between operators.

#-*-coding:utf-8-*-
__author__ =' Allen '

Priority Use Combat

Priority list 1--function call, addressing, subscript

Priority List 2--Power operation * *
A=4*2**3
PrintA

Priority list 3--Flip Operation ~ #其实翻转和 +,-peer, but flip must be written in the data before, but to flip the operation
Print~18**2 #等于-325, power operation First ~ (18**2)

Priority List No. 4--plus sign
Print2+4*-2
Print4*-2**2 #幂运算优先 > Minus > Multiplication

priority list of the first rank5name--' * ','/','%'(the remainder of the business),'//'(Take the quotient of the whole number)
Print2+4*2/4

Priority List 6--'+'、'-'
Print3<<2+1

Priority List 7--' << '、' >> '
Print18<<1 #18 *2**n,n=1

priority list of the first rank8name--Bitwise AND' & ' >per-Bitwise XOR' ^ ' >by bit or' | '
Example: 3|9^7&18
Print(3|9^7&18) #11 (3| ( 9^ (7&AMP;18)) priority Operation 7&18=2 > 9^2=11 > 3|11=11
Print(((3|9) ^7) &18) #0 3|9=11 > 11^7=12 > 12&18=0

priority list of the first rank9name--comparison Operators' <= ', ' < ', ' > ', ' >= '
A=2*3+5<=5+1*2
PrintA

Priority list 10--Logical' not '、' and '、' or '

There should also be an assignment identifier (= %= /= //= -= += *= **=);
Flag Identifier(is isn't);
member Identifiers(in);
Detailed view of thePythonBasic Operators Documenthttp://www.yiibai.com/python/python_basic_operators.html


Priority list 11--lambda expressions
Examples of lambda expressions:
#!/usr/bin/envpython
li=[{"Age": 20,"Name":"Def"},{"Age": 25,"Name":"ABC"},{"Age": 10,"Name":"Ghi"}]
Li=sorted (li,key=Lambdax:x["Age"])
Print(LI)

If you don't use a lambda expression and write a regular function, you need to do this:
#!/usr/bin/envpython
defComp (x):
 returnx["Age"]
li=[{"Age": 20,"Name":"Def"},{"Age": 25,"Name":"ABC"},{"Age": 10,"Name":"Ghi"}]
Li=sorted (Li,key=comp)
Print(LI)