COMP10001 Lecture Notes - Lecture 3: Hexadecimal, Local Variable
25 May 2018
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define variable
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arity functions by specifying default values for arguments (x=n)
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function variables are not accessible from outside the function call
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functions can access variables defined outside
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each function call defines its own local variable scope
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Functions:
defined for objects of a given type
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called as object.method()
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.upper() = return in all uppercase
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.lower() = return in all lowercase
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.strip(string) = return with all instances of characters in string (whitespace if no string)
removed from start and end
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useful methods
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Methods:
insert variables into string by indexing relative to the arguments to format
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.format()
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f = float
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d = decimal integer
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x = hexadecimal (base
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16) integer
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o = octal (base
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8) integer
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b = binary (base
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2) integer
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format specifiers
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Strings and formatting:
tool to make the computer do something over and over again
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a = a + 1
for i in "abc":
print(a)
e.g. a = 0
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for loops
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range(start, end, step) = generate a sequence of int values from start (inclusive) to end (non
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inclusive), counting step at a time
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while loops
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break ends while loops and bypasses the condition in the while statement
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Iteration:
use ( , ) to build them
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used to represent multi
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variate objects
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to return multiple values
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to swap values between variables
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to test for one of a series of values
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as keys to dictionaries
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useful applications
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immutable (cannot change elements)
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Tuples:
Week 3
Wednesday, 21 March 2018 10:23 PM
Foundations of Computing Page 1
