【333】Python3.6 格式化文本

看如下例子进行体会：

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min_temperature = 0 max_temperature = 300 step = 20   # \t: A tab print('Fahrenheit\tCelsius') # We let fahrenheit take the values # - min_temperature # - min_temperature + step # - min_temperature + 2 * step # - min_temperature + 3 * step # ... # up to the largest value smaller than max_temperature + step for fahrenheit in range(min_temperature, max_temperature + step, step):     celsius = 5 * (fahrenheit - 32) / 9     # {:10d}:  fahrenheit as a decimal number in a field of width 10     # {:7.1f}: celsius as a floating point number in a field of width 7     #          with 1 digit after the decimal point     print(f'{fahrenheit:10d}\t{celsius:7.1f}')

 

random.random()：返回一个0与1之间的浮点数

random.randint(a, b)：返回a与b之间的一个整数

建立随机列表

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>>> [10] * 5 [10, 10, 10, 10, 10]   >>> [10 for _ in range(5)] [10, 10, 10, 10, 10]   >>> [random.randint(1,10)] * 5 [6, 6, 6, 6, 6]   >>> [random.randint(1,10) for _ in range(5)] [10, 7, 9, 10, 4]

列表变换

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>>> a = [1, 2, 4, 5]         >>> b = [str(i) for i in a] >>> b ['1', '2', '4', '5']   >>> c = ["A"+i+"A" for i in b] >>> c ['A1A', 'A2A', 'A4A', 'A5A']