python study notes, video day10

pycharm the first program:

File->New Project,new->directory,new->Python File

1, the operator

+ - * / **% //
determines whether contained therein: in not in the results: Boolean (True False)
added:
first calculation, the execution order in brackets: front to back
results
　　True or ==> True
　　True and = => continue
　　False or ==> continue
　　False and == "False

The result is the value of
　　an arithmetic operation
　　　　a = 10 * 10
　　assignment operator
　　　　a = a + 1 a + = 1

the result is a Boolean
　　comparison operation
　　　　a = 1 <5
　　logical operation
　　　　a = 1> 6 and 1 == 1
　　member operator
　　　　a = "Q" in "day to ask"

 

2, the basic data types 　　

Digital int    

　　 bit_length
string str

# EndsWith, to what end 
            Test = " hearewa " 
            V = test.endswith ( ' A ' )
             Print (V) 
        results 
            True

 # The Find next start looking from, find the location of # index also find, can not find the error 
            the Test = " hearaewa " 
            v = test.find ( ' A ' , 5, 8 )
             Print (v) 
        the results of
             7

# The format, will replace the placeholder a string to a specified value 
            Test = ' I AM {name}, Age {A} ' 
            V1 = test.format (name = ' DA ' , A =. 19 ) 
            V2 = Test .format_map ({ ' name ' : ' FEI ' , ' A ' : 18 is })
             Print (V1)
             Print (V2) 
        results 
            I AM DA, Age . 19 
            I AM FEI, Age 18 is

# encode
# decode

 #isalnum () string contains only letters and numbers

 

List list
Ganso tuple
dictionary dict
Boolean value bool