#### Base syntax

How to define a new concept


    concept newFile:
    
        props:
            name    
    
        pre:
            import os
            os.path.isfile(name) == False
        
            
        post:
            import os
            os.path.isfile(name) == True
        
        main:
            f = open(name)
            f.close()
            __context__.add(newFile, name, f)

example

    create a new file named MyFirstFile.txt => newFile("MyFirstFile.txt")



concept newFile:

    props:
        name
        path

    pre:
        import os
        os.path.isfile(path) == False
    
        
    post:
        import os
        os.path.isfile(path) == True
    
    main:
        import os
        f = open(name)
        f.close()
        sheeka.add(File(name, path))
    

concept open:
    
    pre:
        self.is_opened == False
        
    post:
        self.is_opened == True
        
    main:
        self.open
        
        
open the door => d = get_instance(door) && get_concept(open).call(d)
        

concept File:
    
    props:
        name
        path
        
     def open(): 
     
     
     def close():

open the file toto.txt => get_concept(open).call(File(path="toto.txt", name="toto.txt))

concept is_the_opposite:
    
    props:
        a, b
        
    test:
        a.pre == not b.pre && a.post == b.post
      

print all concepts

concepts
print all

concept print:
    
    main:
        print(self)

concept all:

    main:
        self.find_all()