PYTHON TEST
01. Given ``odd = set([1, 3, 5, 7, 9])``
``squares = set([1, 4, 9, 16])``.
What is the value of ``odd ^ squares``?
Ans : set([3, 4, 5, 7,
16])
02. What
does ones_like() function do?
Ans : Return an array of ones with the same shape and type as a
given array
03. What is
the output of following?
x = 12345
for i in x :
print(i)
Ans : error
04. How do
you save a figure in png format with the name sine-curve?
Ans : savefig(‘sine-curve.png’)
05. What is
the output of following?
list = [1,2,3,4,5,6,7,8,9,10]
l = sum(list[::2])
print(l)
Ans : 25
06. What
error occurs when you execute?
a = b
Ans : NameError
07. What is
the value assigned as index to the first element in a list?
Ans : 0
08. You
should keep open the plot while saving the it.
Ans : True
09. What is
the output of following?
print(“abcabcab”.split(‘c’, 0))
Ans : [‘abcabcab’]
10. What is
the output of the following?
a1 =
array([[1,2,3,4],[5,6,7,8],[9,10,11,12]])
print(a1[:,1])
Ans : Error
11. What
arithmetic operators cannot be used with strings ?
Ans : -
12. What is
the output of the expression, 7*1**7 ?
Ans : 7
13. Which
of the following functions does exactly the opposite of split() function ?
Ans : join()
14. To use
the loadtxt command, each row should have the same number of values?
Ans : True
15. What is
the value assigned as index to the first element in a list?
Ans : 0
16. Which
marker is used to get circles...?
Ans : "0"
17. Which
of the following creates 100 equally spaced points between -pi/2 and pi/2?
Ans : linspace(-pi/2, pi/2, 100)
18. Which
of the following imports the odeint function.?
Ans : from scipy.integrate import odeint
19. Given
two arrays A and B where ``A`` which contains co-efficients of a system of
equations and ``B`` which
contains it’s constants. How will you solve the
given system of equations?
Ans : solve(A,B)
20. Given
the list primes, ``primes = [2, 3, 5, 7, 11]``, Which of the following code
will produce the reverse of the list
``primes``:
(A) primes.reverse()
(B) primes[::-1] ?
Ans : Both (A) and (B) are correct
21. Whih
command is used to clear the plot?
Ans : clf()
22. What is
the output of the below code snippet?
x=0
for y in range(21):
x+=y
print x
Ans : Sum of numbers up to 20(including)
23. Given
strings s and t, ``s = "Hello"`` and ``t = "World"`` and
an integer r, ``r = 2``. What is the
output of s * r + s * t?
Ans : HelloHelloWorldWorld
24. ``x =
array([1, 2, 3], [5, 6, 7])`` is a valid statement?
Ans : False
25.
Indentation is not mandatory in Python?
Ans : False
26. What is
the function to get both eigen values and eigen vectors of a matrix?
Ans : eig()
27. If ``a
= [1, 1, 2, 3, 3, 6,6,4]``. What is set(a)
Ans : set([1, 2, 3, 6, 4])
28. What
will be the output of the below code?
list1
= [1, 2, 3]
list1.append([4, 5, 6])
print(len(list1))
Ans : 4
29. Given
the array, ``A = array([12, 15, 18, 21])``, how do we access the element
``18``?
Ans : A[2]
30. The %
in %hist exist in all python interpreters.
Ans : False
