【333】Python3.6 格式化文本

看如下例子进行体会：

min_temperature = 0
max_temperature = 300
step = 20

# 	: A tab
print('Fahrenheit	Celsius')
# 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}	{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

>>> [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

>>> 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']