OAU CSC 201 Practice Quiz

The code shown above is used to check whether a particular item is a part of a given set or not. Since ‘a’ is a part of the set z, the output is true. Note that this code would result in an error in the absence of the quotes.

The string x is being shortened by one character in each iteration.

The expression shown above is evaluated as: 2+9*(36-8)/10, which simplifies to give 2+9*(2.8), which is equal to 2+25.2 = 27.2. Hence the result of this expression is 27.2.

This is a built-in function which rounds a number to give precision in decimal digits. In the above case, since the number of decimal places has not been specified, the decimal number is rounded off to a whole number. Hence the output will be 5.

The one’s complement of a value is obtained by simply changing all the 1’s to 0’s and all the 0’s to 1’s. Hence the one’s complement of 110010101 is 001101010.

The code shown above uses multiple decorators. The output of this code is:

    *****
    %%%%%
    hello
    %%%%%
    *****

The function len() returns the length of the number of elements in the iterable. Therefore the output of the function shown above is 4.

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

NameError, i is not defined.

The function seed is a function which is present in the random module. The functions sqrt and factorial are a part of the math module. The print function is a built-in function which prints a value directly to the system output.

The built in function vars() returns a dictionary containing all the variables that exist in the place. Hence the output of the code shown above is: {‘a’ : ‘hello’, ‘q’ : 10, ……..plus built-in names set by Python….}

The code shown above returns the address on the function ordi first, after which the word “Ordinary” is printed. Hence the output of this code is:
Address
Ordinary.

The expression shown above results in the output 456.

getopt parses options received from the command line.

i is not in x[1:].

The \n adds a new line.

The output of bin(10-2) = 0b1000 and that of bin(12^4) is ob1000. Hence the output of the above expression is: 0b10000b1000.

The def keyword is used to create, (or define) a function in python.

he function sys.version can help us to find the version of python that we are currently working on. It also contains information on the build number and compiler used. For example, 3.5.2, 2.7.3 etc. this function also returns the current date, time, bits etc along with the version.

The @ symbol can be used as an alternate way to specify a function that needs to be decorated. The output of the codes shown above is the same. Hence they are equivalent. Therefore this statement is true.

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 expression not(10<20) returns false. The expression not(10>30) returns true. The and operation between false and true returns false. Hence the output is false.

The code shown above demonstrates rebinding using a static method. This can be done with or without a decorator. The output of this code will be 100.

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

The expression shown above is an example of explicit conversion. It is evaluated as int(43.55+1) = int(44.55) = 44. Hence the result of this expression is 44.

The code shown above prints the appropriate option depending on the conditions given. The condition which matches is (9>0), and hence the output is: good.

Explanation: Objects of type int aren’t subscriptable. However, if the statement was x[i], an error would not have been thrown.

The code shown above shows the formatting option on the same value, that is 4.56, where in the second case, the value is enclosed in a list. Hence the output of the code shown above is:
‘4.56’, ‘[4.56]’

Id in this case will be the attribute of the instance.

The two codes shown above represent the same operation but in different formats. The output of both of these functions is: ‘0.33’. Hence the statement is true.

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

(element,) is not the same as element. It is a tuple with one item.

In the code shown above, various formatting options are displayed using the format option. Hence the output of this code is: ‘1.234560, 1.234560, 01.23’

+ operator is concatenation operator.

OverflowError, cannot convert float infinity to integer.

The highest precedence is that of the exponentiation operator, that is of **.

SyntaxError, True is a keyword and it’s value cannot be changed.

The formatting method {1:<10} represents the second positional argument, left justified in a 10 character wide field.

Neither of 0.1, 0.2 and 0.3 can be represented accurately in binary. The round off errors from 0.1 and 0.2 accumulate and hence there is a difference of 5.5511e-17 between (0.1 + 0.2) and 0.3.

Case is always significant while dealing with identifiers in python.

True, False and None are capitalized while the others are in lower case.

When both of the operands are integer then python chops out the fraction part and gives you the round off value, to get the accurate answer use floor division. This is floor division. For ex, 5/2 = 2.5 but both of the operands are integer so answer of this expression in python is 2. To get the 2.5 answer, use floor division.