OAU CSC 201 Practice Quiz

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

+’ cannot be converted to a float.

The code shown above first prints the word “Decorated” and then “ordinary”. Hence the output of this code is:
Decorated
Ordinary.

eval can be used as a variable.

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.

Loops over the elements of the set and prints them.

String x is not being altered and i is in x[:-1].

Variable x is incremented and printed twice.

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.

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.

in is a keyword.

The code shown above shows a general decorator which can work with any number of arguments.

In python, power operator is x**y i.e. 2**3=8.

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

Execute help(math.trunc) to get details.

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 @ 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.

All the statements will execute successfully but at the cost of reduced readability.

The above expression returns the output 000345. It adds the required number of zeroes before the given number in order to make the number of digits 6 (as specified in this case).

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.

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

Suppose we have an expression ~A. This is evaluated as: -A – 1. Therefore, the expression ~100 is evaluated as -100 – 1, which is equal to -101.

i takes values 0, 1, 2 and 3.

Python has a nifty feature called documentation strings, usually referred to by its shorter name docstrings. DocStrings are an important tool that you should make use of since it helps to document the program better and makes it easier to understand.

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’.

eval can be used as a variable.

“i” is not in “abcdef”.

The expression shown above normally returns the value with 6 decimal points if it is not specified with any number. Hence the output of this expression will be: 34.000000 (6 decimal points).

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.

The symbol ‘&’ represents bitwise AND. This gives 1 if both the bits are equal to 1, else it gives 0. The binary form of 15 is 1111 and that of 12 is 1100. Hence on performing the bitwise AND operation, we get 1100, which is equal to 12.

Execute help(round) in the shell to get details of the parameters that are passed into the round function.

Loops over the values.

The expression shown above results in the output 456.

Causes a KeyError.

Although the presence of parenthesis does affect the order of precedence, in the case shown above, it is not making a difference. The result of both of these expressions is 1.333333333. Hence the statement is true.

range(int(2.0)) is the same as range(2).

[::-1] reverses the string.

The @ symbol along with the name of the decorator function can be placed above the definition of the function to be decorated works as an alternate way for decorating a function.

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

^ is the Binary XOR operator.

The given number is -122. Here the total number of digits (including the negative sign) should be 6 according to the expression. In addition to this, there is a negative sign in the given print expression. Hence the output will be −−00122.

Cause a decimal value of 0 to appear as output.

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’.

// is integer operation in python 3.0 and int(..) is a type cast operator.

The expression int(1011,2) results in an error. Had we written this expression as int(‘1011’,2), then there would not be an error.

In Python, to define a block of code we use indentation. Indentation refers to whitespaces at the beginning of the line.

^ is the XOR operator. The binary form of 4 is 0100 and that of 12 is 1100. Therefore, 0100^1100 is 1000, which is equal to 8.

Within the subject string, curly braces represent substitution targets and arguments to be inserted. Hence the output of the code shown above:
‘hello, world, universe’.