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Expressions and assignment
We can think of most computer programs as performing some sort of transformation on data. Our code may get as input the exam scores of everyone in the class and generates the average score as output. Or, in a transducer architecture, we may think about writing the program that takes the current memory state of the transducer and an input, and calculates a new memory state and output.
To represent data in a computer, we have to code it, ultimately as sequences of binary digits (0s and 1s). The primary memory of a computer is spited into 'words', which typically hold 32 or 64 bits; a word can be used to save a number, one or various characters, or a pointer to (the address of) another memory location.
A computer program, at the lowest section, is a set of primitive statement, also encoded into bits and saved in the words of the computer's memory. These instructions defines operations to be operated on the data (and sometimes the program itself) that are stored in the computer's memory. In that class, we will not do at the part of these low-level instructions: a high-level programming language such as Python lets us abstract away from these information. But it is very important to have an abstract model of what is going on within the computer.
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Interacting with the environment Computer systems have to communicate with the world around them, getting information about the external world, and taking actions to cha
python program of motion of a particle in viscus medium
Task (Anagrams) Write a function that checks whether two words are anagrams. Two words are anagrams if they contain the same letters. Fore example, silent and listen are anagrams.
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Common Errors and Messages Here are some common Python errors and error messages to look out for. Please let us give if you have any favorite additions for this list.
Print vs Return Here are two different method declarations: def f1(x): print x + 1 def f2(x): return x + 1 What happens when we call them? >>> f1(3) 4 >>
Worked example 1 Let's examine what happens when we compute the following Python code: def p(x, y): z = x*x - y return z + 1/z >>> p(1.0, 2.0) -2.0
Non-local references So far, whenever we needed to compute a variable, there was a binding for that variable in the 'local' environment (the environment in which we were e
Procedures as first-class objects In Python, unlike many other languages, methods are behave in much the same way as num bers: they can be stored as values of variable
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