Python100例 我的实现展示(41-45例)

'''41、模仿静态变量的用法。(该题为宽泛性问题，模仿跟着题目做的)'''

def exchange(s2):
    s = list(s2)
    for i in range(int(len(s) / 2)):
        t = s[i]
        s[i] = s[len(s) - 1 - i]
        s[len(s) - 1 - i] = t
    return "".join(s)

'''class Static:
    StaticVar = 5

    def test_exam_41(self):
        self.StaticVar += 1
        print(self.StaticVar)


print(Static.StaticVar)
a = Static()
for i in range(3):
    a.test_exam_41()'''


def test_exam_41():
    var = 0
    print('var = %d' % var)
    var += 1


'''42、学习使用auto定义变量的用法。（自定义方法）'''


def auto_func():
    print("调用方法并返回从1加到10的和")
    total = 0
    for i in range(10):
        total += i
    return total


def test_exam_42():
    print("调用字符串逆序方法")
    print(exchange("0123456789"))
    print(auto_func())


'''43、模仿静态变量(static)另一案例。(参考)'''


class Num:
    nNum = 1

    def test_exam_43(self):
        self.nNum += 1
        print('nNum = %d' % self.nNum)


'''44、两个 3 行 3 列的矩阵，实现其对应位置的数据相加，并返回一个新矩阵：
X = [[12,7,3],
    [4 ,5,6],
    [7 ,8,9]]
Y = [[5,8,1],
    [6,7,3],
    [4,5,9]]'''


def test_exam_44():
    x = [[12, 7, 3],
         [4, 5, 6],
         [7, 8, 9]]
    y = [[5, 8, 1],
         [6, 7, 3],
         [4, 5, 9]]
    z = [[0 for col in range(3)] for row in range(3)]
    for i in range(3):
        for j in range(3):
            z[i][j] = x[i][j] + y[i][j]
    print("2个3行3列的数组对应元素相加之后得到的数组如下：")
    print(z)


'''45、统计 1 到 100 之和。'''


def test_exam_45():
    total = 0
    for i in range(1, 101):
        total += i
    print("1 到 100 之和为%d" % total)

if __name__ == '__main__':

    '''for i in range(3):
        test_exam_41()'''
    # test_exam_42()
    '''nNum = 2
    inst = Num()
    for i in range(3):
        nNum += 1
        print('The num = %d' % nNum)
        inst.test_exam_43()'''
    # test_exam_44()
    test_exam_45()