The very first operation to work on a file is to open it. In Python, the open() function (built-in function) is used to open a file in both read and write mode. Everything here except the ^ involves sending more messages. In evaluating factorial(2) the second equation is used but this time n is bound to 2. factorial 2 = 2 * factorial(2-1) = 2*factorial(1) Similarly this generates the call factorial 1 = 1 * factorial 0 The expression factorial 0 is dealt with by the first equation - it returns the value 1. HP 35s scientific calculator user's guide H Edition 1 HP part number F2215AA-90001 This function returns a file object. The unary operator (&) gives the memory address of v, for example: p = &v; while the (*) operator gives the value that pointer p points to, for example: value = *p. We call the (*) operation dereferencing, and it is important in assembler, as shown below: We can now "unwind" the recursion. In the open() function, we define two arguments in which the first is the file name …
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