20190616 - and and or use

1  "" " if parentheses: first calculate the brackets
 2      Without parentheses:
 3      execution sequence: front to back
 4      Results: == True or" True
 . 5          True and == "continue to walk
 . 6          False or ==" continue to walk
 7          and == false "Flase
 . 8  " ""   
. 9 User = ' Ales ' 
10 pwd = ' 123 ' 
. 11 V1 = User == ' Ales '  and pwd == ' 1233 '  or User == ' Alex '  and pwd == '1273' and user == 'alets'
12 v2 = user == 'ales' and (pwd == '1233' or user == 'alex' and pwd == '1273')
13 print(v1)
14 print(v2)

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false
false