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a variable is a made of two thing its name and its value
Name is a label of each box(example) where we can find easily what box is there in the warehouse
The name of a variable should reflect its content, i what we store there
value are what we put in the box sometimes it can be a default value that will be assigned to a variable
assigning a value to a variable for the first time is called initialization
functions can have parameters and return values.
a return value is the result of running the function. The return value is returned to the code that called the function, to be used as needed.
the parameters are the data necessary for a function to be run and generate a result.
parameters are variables defined by a name. Parameters are specified in the function declaration.
when using a function, you pass it different values as parameters. These values are called arguments.
you can use the help function to print the documentation of a given function.
a class is the outline of an object, defining its attributes and methods. From the same class, you can therefore create several objects of the same type, but with different attributes—these are called class instances.
replace(old, new) : this method takes two arguments: old and new, both of which are strings. The method returns the original string with all occurrences of old replaced with new.
find(string) returns either the index of the first occurrence of the string passed in the argument, or -1 if it does not find it.
A class is a construction plan for an object.
A variable is an instance of a class, or an object.
An object is defined by its attributes.
All instances of a class have access to the same methods via the. (dot) notation.
A method, like a function, generally does not modify the initial object.
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