54 lines
1.6 KiB
Python
54 lines
1.6 KiB
Python
# 1、将字典中的数据变成['x=A', 'y=B', 'z=c']的样式
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dict = {'x': 'A', 'y': 'B', 'z': 'C' }
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# print(dict.items()) # 将字典转换成列表格式 [('x', 'A'), ('y', 'B'), ('z', 'C')]
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list = [f'{key} = {val}' for key,val in dict.items()] # 元组解构两个之key,val
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print(list) # 'x = A', 'y = B', 'z = C']
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# 2、将所用元素变成纯小写
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list = ["ADDD","dddDD","DDaa","sss"]
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print([item.lower() for item in list]) # item列表的每一项 ['addd', 'ddddd', 'ddaa', 'sss']
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print([item.upper() for item in list]) # item列表的每一项 ['ADDD', 'DDDDD', 'DDAA', 'SSS']
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# 3、x是0-5之间的偶数,y是0-5之间的奇数 把x,y组成一起变成元组,放到列表当中
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# print([(x,y) for x in range(0,6) if x%2==0 for y in range(0,6) if y%2!=0])
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# [(0, 1), (0, 3), (0, 5), (2, 1), (2, 3), (2, 5), (4, 1), (4, 3), (4, 5)]
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# list = [(0,1),(2,3),(4,5)]
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# print([(x,y) for x,y in list])
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# 4、使用列表推导式 制作所有99乘法表中的运算
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# list = [f'{i}x{j}={i*j}' for i in range(0,10) for j in range(0,10)]
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# print(list)
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# 5、求M,N中矩阵和元素的乘积
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M = [[1,2,3], [4,5,6], [7,8,9]]
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N = [[2,2,2], [3,3,3], [4,4,4]]
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# =>实现效果1 [2, 4, 6, 12, 15, 18, 28, 32, 36]
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# =>实现效果2 [[2, 4, 6], [12, 15, 18], [28, 32, 36]]
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list = [M[i][j]*N[i][j] for i in range(0,3) for j in range(0,3)]
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print(list) # [2, 4, 6, 12, 15, 18, 28, 32, 36]
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list1 = [[M[i][j]*N[i][j] for i in range(0,3)] for j in range(0,3)]
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print(list1) # [[2, 12, 28], [4, 15, 32], [6, 18, 36]]
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# print(M[0][0])
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# print(N[0][0])
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# print(M[0][1])
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# print(N[0][1])
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# print(M[0][2])
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# print(N[0][2])
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