Conditions and operator

2. What is the condition? What can be used as conditions? Why use conditions? 
    Explicit Boolean: True, False 
    first category: Explicit Boolean 
                condition may be: the comparison operators 
                Age = 18 is 
                Print (Age> 16) after the determination condition # will be a Boolean value 

                condition may be: True, False 
                is_beautiful True = 
                Print (is_beautiful) 


    implicit Boolean: all data types, wherein 0, None, false air 
                implicit Boolean, all values are used as the conditions to 
                which 0, None, an empty (the empty string, an empty list , empty dictionary) = "represents the Boolean value is False, the rest are true 

3: logical operators: 
    # Not, and, or 
        Not: that condition is the result of the immediately following negated ps: not keep up with it after that condition is an indivisible whole 

        and: logic and about to link the two conditions and, at the same time the two conditions is true, the final result to be true 

        or: logical or, or about to link the two conditions, whenever there is a two conditions is True, the final result is True, 
                both conditions are under the False case, the end result was to False

    # Prioritization: 

    if the individual link and just a bunch, or just a bunch of individual links or, sequentially from left to right along the operational information to 
    the short-circuit operation (lazy principle): and when the connection is, as long as there is a fake operation will not continue in the future, direct the outcome, or the same, or all is connected, 
                         as long as there is a real will not continue in the future carry out operations, direct the outcome. 
    If it is mixed, it is necessary to consider the priority of 
            not> and> or 
            to Not calculated, and then; connected condition enclosed (), and then the rest of the plurality of conditions or connections. 

4, the operator member 
    in: determining whether there is a character string in a large string
　　　　　

　　　　print("egon" in "hello egon")

        Determine whether the element exists in the list

　　　　print(111 in [111,222,33])

        Determine whether the key exists in the dictionary

　　　　print("k1" in {"k1":111,'k2':222})

    not in: 
        Print ( "Egon" not in "the Hello Egon") # recommended 
        print (in "hello egon" not "egon") # logic above, but semantics is not clear, is not recommended 

5, the identity of the operator 
    is: judge is equality id 
    ==: determining whether the value is equal to