Python Answers

Write a Python statement that creates a list named dog_breeds that contains the elements
'collie', 'sheepdog', 'Chow', and 'Chihuahua'.

What is the value of pairs after the following assignment?
pairs=[(x,y) for x in range(4) for y in range(3) if (x+y)%3==0]

i am looking for syntax of the below query
one vs rest classification with logistic regression, alpha =1, need to get confusion matrix also

What is the value of pairs after the following assignment?
pairs = [ (x,y) for x in range(4) for y in range(3) if (x+y)%3 == 0 ]

Write a function intreverse(n) that takes as input a positive integer n and returns the integer obtained by reversing the digits in n.

Here are some examples of how your function should work.

>>> intreverse(783)
387
>>> intreverse(242789)
987242
>>> intreverse(3)
3

def mystery(l):
if l == []:
return (l)
else:
return (l[-1:] + mystery(l[:-1]))
What does mystery([13,23,17,81,15]) return?

One of the following 10 statements generates an error. Which one? (Your answer should be a number between 1 and 10.)

x = [1,"abcd",2,"efgh",[3,4]] # Statement 1
y = x[0:50] # Statement 2
z = y # Statement 3
w = x # Statement 4
x[1] = x[1] + 'd' # Statement 5
x[1][1] = 'y' # Statement 6
y[2] = 4 # Statement 7
z[0] = 0 # Statement 8
w[4][0] = 1000 # Statement 9
a = (x[4][1] == 4) # Statement 10

Write a function matched(s) that takes as input a string s and checks if the brackets "(" and ")" in s are matched: that is, every "(" has a matching ")" after it and every ")" has a matching "(" before it. Your function should ignore all other symbols that appear in s. Your function should return True if s has matched brackets and False if it does not.

Here are some examples to show how your function should work.


>>> matched("zb%78")
True
>>> matched("(7)(a")
False
>>> matched("a)*(?")
False
>>> matched("((jkl)78(A)&l(8(dd(FJI:),):)?)")
True

Write a function intreverse(n) that takes as input a positive integer n and returns the integer obtained by reversing the digits in n.

Here are some examples of how your function should work.

>>> intreverse(783)
387
>>> intreverse(242789)
987242
>>> intreverse(3)
3

One of the following 10 statements generates an error. Which one? (Your answer should be a number between 1 and 10.)

x = [1,"abcd",2,"efgh",[3,4]] # Statement 1
y = x[0:50] # Statement 2
z = y # Statement 3
w = x # Statement 4
x[1] = x[1] + 'd' # Statement 5
x[1][1] = 'y' # Statement 6
y[2] = 4 # Statement 7
z[0] = 0 # Statement 8
w[4][0] = 1000 # Statement 9
a = (x[4][1] == 4) # Statement 10