#4-3 数到20:
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3#4-3 数到20 for num in range(1, 21): print(num)
输出:pass
#4-5 计算1~1 000 000的总和:
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10#4-5 计算1~1 000 000的总和 import time nums = list(range(1, 1000001)) print(min(nums)) print(max(nums)) time1 = time.clock() print(sum(nums)) time2 = time.clock() message = 'It costs ' + str(time2 - time1) + 's' print (message)
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41 1000000 500000500000 It costs 0.1980368107604632s
#4-6 奇数:
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4#4-6 奇数 nums = list(range(1, 20, 2)) for num in nums: print(num)
输出:pass
#4-7 3的倍数:
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4#4-7 3的倍数 nums = list(i*3 for i in range(1, 11)) for num in nums: print(num)
输出:pass
#4-8 立方:
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4#4-8 立方 nums = list(i**3 for i in range(1, 11)) for num in nums: print(num)
输出:pass
#4-9 立方解析:
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3#4-9 立方解析 nums = list(i**3 for i in range(1, 11)) print(num)
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1[1, 8, 27, 64, 125, 216, 343, 512, 729, 1000]
#4-10 切片:
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12#4-10 切片 nums = list(i**3 for i in range(1, 11)) print(nums) message = 'nThe first three items in the list are:' print(message) print(nums[:3]) message = 'nThree items from the middle of the list are:' print(message) print(nums[3:6]) message = 'nThe last three items in the list are:' print(message) print(nums[-3:])
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7[1, 8, 27, 64, 125, 216, 343, 512, 729, 1000] The first three items in the list are: [1, 8, 27] Three items from the middle of the list are: [64, 125, 216] The last three items in the list are: [512, 729, 1000]
最后
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