Question 80¶

Question¶

Please write a program to print the list after removing even numbers in [5,6,77,45,22,12,24].

Hints¶

Use list comprehension to delete a bunch of element from a list.

Solutions:

In [ ]:

def isEven(n):
    return n % 2 != 0


li = [5, 6, 77, 45, 22, 12, 24]
lst = list(filter(isEven, li))
print(lst)

OR

In [ ]:

li = [5, 6, 77, 45, 22, 12, 24]
lst = list(filter(lambda n: n % 2 != 0, li))
print(lst)

Question 81¶

Question¶

By using list comprehension, please write a program to print the list after removing numbers which are divisible by 5 and 7 in [12,24,35,70,88,120,155].

Hints¶

Use list comprehension to delete a bunch of element from a list.

Solutions:

In [ ]:

li = [12, 24, 35, 70, 88, 120, 155]
li = [x for x in li if x % 35 != 0]
print(li)

Question 82¶

Question¶

By using list comprehension, please write a program to print the list after removing the 0th, 2nd, 4th,6th numbers in [12,24,35,70,88,120,155].

Hints¶

Use list comprehension to delete a bunch of element from a list. Use enumerate() to get (index, value) tuple.

Solutions:

In [ ]:

li = [12, 24, 35, 70, 88, 120, 155]
li = [li[i] for i in range(len(li)) if i % 2 != 0]
print(li)

Question 83¶

Question¶

By using list comprehension, please write a program to print the list after removing the 2nd - 4th numbers in [12,24,35,70,88,120,155].

Hints¶

Use list comprehension to delete a bunch of element from a list. Use enumerate() to get (index, value) tuple.

Solutions:

In [ ]:

# to be written
li = [12, 24, 35, 70, 88, 120, 155]
li = [li[i] for i in range(len(li)) if i < 3 or 4 < i]
print(li)

Question 84¶

Question¶

**By using list comprehension, please write a program generate a 3*5*8 3D array whose each element is 0.**

Hints¶

Use list comprehension to make an array.

Solution:

In [ ]:

array = [[[0 for col in range(8)] for col in range(5)] for row in range(3)]
print array