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CSCA08H3 Lecture : Worksheet

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raspberryyak550
19 Oct 2011
School
UTSC
Department
Computer Science
Course
CSCA08H3
Professor
Kathy Fellowes

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Document Summary

Defining a function in python f(x) = x2 f(3) = ______ f(5) = ______ Function definition def double(num): return num + num. Example: function with local variables (func_localvars. py) def polynomial(a, b, c, x): first = a * x * x second = b * x third = c return first + second + third. Consider the following function definition: def strange (x, y): z = 4 z = z + x - y return z + 2. Question: translate this function into python: g(x) = x + 5. What does this program do? def f(x): return x + 3 y = 9 y = f(2) print y. What do the following evaluate to? g(1) g(-4. 2) g(g(5)) f(g(4)) Inside-out rule: apply g, then apply f to the result. Practise: write a function that figures out the total amount of red in a picture.

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Related Questions

Example 1: Define a function that takes an argument. Call the function. Identify what code is the argument and what code is the parameter.

Example 2: Call your function from Example 1 three times with different kinds of arguments: a value, a variable, and an expression. Identify which kind of argument is which. 

Example 3: Create a function with a local variable. Show what happens when you try to use that variable outside the function. Explain the results.

Example 4: Create a function that takes an argument. Give the function parameter a unique name. Show what happens when you try to use that parameter name outside the function. Explain the results.

Example 5: Show what happens when a variable defined outside a function has the same name as a local variable inside a function. Explain what happens to the value of each variable as the program runs.

write the definition of a function min that has two int parameters and returns the smaller.

Write a function find_decrypted_words() that takes a file name as parameter, reads that text file and decrypts all of the words by using previously created decode_string() function (in part-4). The function will print perfectly decrypted words and the number of deficient ones. If all characters converted successfully it means that the string is decrypted perfectly (i.e. no "?" in decrypted string).

Write a Python statement that calls the above defined function with the file "encryptedwords.txt".

Part-5:

Decoding encrypted words...

Decoded words:

ALERT

TREX

33  number of words cannot decrypted succesfully