OAU CSC 201 Practice Quiz

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).

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).

Objects of type set have no attribute values.

The above expression is an example of explicit conversion. It is evaluated as: float(4+int(2.39)%2) = float(4+2%2) = float(4+0) = 4.0. Hence the result of this expression is 4.0.

// 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.

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.

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.

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

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 not passed any parameter to the function p. Hence 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.

The binary form of 1 is 0001. The expression x<<2 implies we are performing bitwise left shift on x. This shift yields the value: 0100, which is the binary form of the number 4.

eval can be used as a variable.

i is not in x[1:].

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.

~x is equivalent to -(x+1).

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.

range(str) is not allowed.

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

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

The loop is entered twice.

[::-1] reverses the list.

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.

Variable names can be of any length.

SyntaxError, there shouldn’t be a space between + and = in +=.

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.

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

Execute help(id) to find out details in python shell.id returns a integer value that is unique.Execute help(id) to find out details in python shell.id returns a integer value that is unique.

Carefully look at the colons.

Identifiers can be of any length.

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.

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

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).

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

Lists should be copied by executing [:] operation.

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.

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

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

The order of precedence is: %, +.

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

Hence the result is 7.

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.

Expression 1 is evaluated as: 2**9, which is equal to 512. Expression 2 is evaluated as 8**2, which is equal to 64. The last expression is evaluated as 2**(3**2). This is because the associativity of ** operator is from right to left. Hence the result of the third expression is 512.

Control exits the loop when i becomes 7.

The code shown above shows two functions. In both the cases the right operand is returned. This is because each function is evaluated from left to right. Since the left operand is false, it is assumed that the right operand must be true and hence the right operand is returned in each of the above case.

“i” is not in “abcdef”.

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).

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]’.

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

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