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# 1.1.4 Machine Interpretation of a Program
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## Session Overview
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This lecture introduces the notion of decomposition and abstraction by specification. It also covers Python modules, functions, parameters, and scoping. Finally, it uses the Python assert statement and type 'str'.
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## Session Activities
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### Lecture Videos
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* [Lecture 4: Machine Interpretation of a Program](http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-00sc-introduction-to-computer-science-and-programming-spring-2011/unit-1/lecture-4-machine-interpretation-of-a-program/) (00:50:18)
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* **About this Video** - Topics covered: Decomposition, module, function, abstraction, formal parameter, actual parameter, argument, assert, scope, mapping, stack, last in first out, LIFO, strings, slicing.
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* **Resources**:
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* [Lecture Code]()
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* [Lecture code handout (PDF)](http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-00sc-introduction-to-computer-science-and-programming-spring-2011/unit-1/lecture-4-machine-interpretation-of-a-program/MIT6_00SCS11_lec04.pdf)
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## Check Yourself
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### What is decomposition?
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Decomposition breaks a problem into self-contained, manageable parts.
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### What is abstraction?
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Abstraction allows us to ignore the details of a piece of code, and use it as a black box - input x, get y.
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### What is the difference between formal and actual parameters?
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Formal parameters are the names of variables used inside a procedure; actual parameters (or arguments) are the values to those names.
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