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 function max() is being used to find the maximum value from among -3, -4 and false. Since false amounts to the value zero, hence we are left with min(0, 2, 7) Hence the output is 0 (false).

eval can be used as a variable.

NameError, i is not defined.

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.

‘.py’ is the correct extension of the Python file. Python programs can be written in any text editor. To save these programs we need to save in files with file extension ‘.py’.

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.

For order of precedence, just remember this PEMDAS (similar to BODMAS).

OverflowError, cannot convert float infinity to integer.

Control exits the loop when i becomes 7.

Padding is done towards the right-hand-side first when the final string is of even length.

The result of the expression shown above is 1.0 because print rounds off digits.

Lists should be copied by executing [:] operation.

In the code shown above, the format specifier %s is replaced by the designated substitution. Hence the output of the code shown above is: ‘mumbai, kolkata & delhi’.

Here i i i i i … printed continuously because as the value of i or x isn’t changing, the condition will always evaluate to True. But also here we use a citation marks on “i”, so, here i treated as a string, not like a variable.

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

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….}

[::-1] reverses the string.

Causes a KeyError.

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

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

The expression int(‘1111’,2) gives the result 15. The expression int(‘1111’, 10) will give the result 1111.

In the code shown above, the decorator helps us to prefix the dollar sign along with the value. Since the second argument is zero, the output of the code is: $100.

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

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

In the snippet of code shown above, three values are inserted into the target string. When we insert more than one value, we should group the values on the right in a tuple. The % formatting expression operator expects either a single item or a tuple of one or more items on its right side.

The loop does not terminate since i is never an even number.

The code snippet shown above results in an error because the above formatting option works only if ‘X’ is a number. Since in the above case ‘X’ is a string, an error is thrown.

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

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’

The code shown above prints the values substituted for a, b, a, in the same order. This operation is performed using the format function. Hence the output of the code is: ‘helloworldhello’.

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

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

9 isn’t allowed in an octal number.

The expression shown above does not result in an error. The output of this expression is -%5d0 989. Hence this statement is incorrect.

List data type can store any values within it.

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’.

When prefixed with the letter ‘r’ or ‘R’ a string literal becomes a raw string and the escape sequences such as \n are not converted.

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

abcd a a a is the output as x is modified only after ‘abcd’ has been printed once.

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.

The output of f(0, 2) is 0, since o%2 is equal to 0. The output of the f(2, 0) is a Zero Division Error. We can make use of decorators in order to avoid this error.

Python shell throws a NoneType object back.

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.

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

All of the operators shown above have associativity from left to right, except exponentiation operator (**) which has its associativity from right to left.