Question 20

Question:

Define a class with a generator which can iterate the numbers, which are divisible by 7, between a given range 0 and n.

Suppose the following input is supplied to the program:

7

Then, the output should be:

0
7
14

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Hints:

Consider use class, function and comprehension.

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Main author's Solution: Python 2

The solution code for this problem was not as reltive to as the problem mentioned and there was a typing mistake while calling the function.

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solution：

class MyGen():
    def by_seven(self, n):
        for i in range(0, int(n/7) + 1):
            yield i * 7

for i in MyGen().by_seven( int(input('Please enter a number... ')) ):
    print(i)

Question 21

Question:

A robot moves in a plane starting from the original point (0,0). The robot can move toward UP, DOWN, LEFT and RIGHT with a given steps. The trace of robot movement is shown as the following:

UP 5
DOWN 3
LEFT 3
RIGHT 2

The numbers after the direction are steps. Please write a program to compute the distance from current position after a sequence of movement and original point. If the distance is a float, then just print the nearest integer. Example: If the following tuples are given as input to the program:

UP 5
DOWN 3
LEFT 3
RIGHT 2

Then, the output of the program should be:

2

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Hints:

In case of input data being supplied to the question, it should be assumed to be a console input.Here distance indicates to euclidean distance.Import math module to use sqrt function.

solution：

from math import sqrt
lst = []
position = [0,0]
while True:
    a = input()
    if not a:
        break
    lst.append(a)
for i in lst:
    if 'UP' in i:
        position[0] -= int(i.strip('UP '))
    if 'DOWN' in i:
        position[0] += int(i.strip('DOWN '))
    if 'LEFT' in i:
        position[1] -= int(i.strip('LEFT '))
    if 'RIGHT' in i:
        position[1] += int(i.strip('RIGHT '))
print(round(sqrt(position[1] ** 2 + position[0] ** 2)))