OAU CSC 201 Practice Quiz

Execute help(math.trunc) to get details.

We can simply convert strings with a %s format expression or the str built-in function. Both of these methods have been shown in this code. Hence the output is: ) (‘3.3456789’, ‘3.3456789’)

The above expression is evaluated as 16%15//16, which is equal to 1//16, which results in 0.

In the code shown above, we have used a decorator in order to avoid the Zero Division Error. Hence the output of this code is:

    hello
    NO

The first letter of the string is converted to uppercase and the others are converted to lowercase.

The code shown above is used to swap the contents of two memory locations using bitwise X0R operator. Hence the output of the code shown above is: 20 10.

In order to add ‘n’ blank spaces after a given string ‘S’, we use the formatting option:(“%-ns”%S).

Loops over the values.

The output of the expression above will be 22.19. This expression specifies that the total number of digits (including the decimal point) should be 5, rounded off to two decimal places.

Each object in Python has a unique id. The id() function returns the object’s id.

The above expressions are evaluated as: 2/2, 8/2, which is equal to (1.0, 4.0).

+’ cannot be converted to a float.

Here, ‘result’ is a list which is extending three times. When first time ‘extend’ function is called for ‘result’, the inner code generates a generator object, which is further used in ‘extend’ function. This generator object contains the values which are in ‘list1’ only (not in ‘list2’ and ‘list3’).
Same is happening in second and third call of ‘extend’ function in these generator object contains values only in ‘list2’ and ‘list3’ respectively.
So, ‘result’ variable will contain elements which are only in one list (not more than 1 list).

Since we have specified that the order of the output be: {a}, {0}, {abc}, hence the value of associated with {a} is printed first followed by that of {0} and {abc}. Hence the output of the code shown above is: ‘2.5, 10, [1, 2]’.

In the code shown above, the value for a is substituted by l[0], that is ‘H’, the value of b is substituted by l[-1], that is ‘O’ and the value for c is substituted by l[1:3]. Here the use of *p is to unpack a tuple items into individual function arguments.

Addition and Subtraction” are at the same precedence level. Similarly, “Multiplication and Division” are at the same precedence level. However, Multiplication and Division operators are at a higher precedence level than Addition and Subtraction operators.

The order of precedence is: %, +.

Hence the expression above, on simplification results in 4 + 3 = 7.

Hence the result is 7.

The ^ operator represent bitwise XOR operation. &: bitwise AND, | : bitwise OR and ! represents bitwise NOT.

The else part is not executed if control breaks out of the loop.

Any odd number on being AND-ed with 1 always gives 1. Any even number on being AND-ed with this value always gives 0.

Within the subject string, curly braces designate substitution targets and arguments to be inserted either by position or keyword. Hence the output of the code shown above:’hello, good,and morning’.

The else part is not executed if control breaks out of the loop.

Changes do not happen in-place, rather a new instance of the string is returned.

Control exits the loop when i becomes 7.

Pickling is the process of serializing a Python object, that is, conversion of a Python object hierarchy into a byte stream. The reverse of this process is known as unpickling.

Python is an interpreted programming language, which supports object-oriented, structured, and functional programming.

The finally block is executed even there is a return statement in the try block.

Functions are reusable pieces of programs. They allow you to give a name to a block of statements, allowing you to run that block using the specified name anywhere in your program and any number of times.

Loops over the elements of the set and prints them.

As the value of i or x isn’t changing, the condition will always evaluate to True.

The code ‘There are %d %s birds.’ %(4, blue) results in the output: There are 4 blue birds. When we insert more than one value, we should group the values on the right in a tuple.

The code shown above prints 1234 for the format specified %d, ‘1234  ’ for the format specifier %-6d (minus ‘-‘ sign signifies left justification), and 001234 for the format specifier %06d. Hence the output of this code is: ‘integers:…1234…1234  …001234’

Cause a decimal value of 0 to appear as output.

Coercion is the implicit (automatic) conversion of operands to a common type. Coercion is automatically performed on mixed-type expressions. The expression 1.7 % 2 is evaluated as 1.7 % 2.0 (that is, automatic conversion of int to float).

The code shown above displays the string method to round off a given decimal number to two decimal places. Hence the output of the code is: ‘1.23’.

Class is a user defined data type.

The code shown above returns a new list containing only those elements of the list l which do not amount to zero. Hence the output is: [1, 2, ‘hello’].

Infinity is a special case of floating point numbers. It can be obtained by float(‘inf’).

In the code shown above, we have not passed any parameter to the function p. Hence the output of this code is: hello.

List data type can store any values within it.

getopt parses options received from the command line.

i is not in x[1:].

A folder of python programs is called as a package of modules.

Explanation: { } creates a dictionary not a set. Only set() creates an empty set.

The prefix 0x specifies that the value is hexadecimal in nature. When we convert this hexadecimal value to binary form, we get the result as: ‘0b1000’.

The instance of the string returned by upper() is being printed.

Modulus operator gives the remainder. So, 22%3 gives the remainder, that is, 1.

// is the operator for truncation division. It is called so because it returns only the integer part of the quotient, truncating the decimal part. For example: 20//3 = 6.