f.write('%s %.2f\n' % (im_path, res))
输出：10_CAM2-1.jpg 2802.78
f’string{fun(variable}’
# 把大括号内看作变量
name = "Tom"
age = 3
f"His name is {name}, he's {age} years old."
输出："His name is Tom, he's 3 years old."
# 数学运算
f'He will be { age+1 } years old next year.'
'He will be 4 years old next year.'
# 对象操作
spurs = {"Guard": "Parker", "Forward": "Duncan"}
f"The {len(spurs)} players are: {spurs['Guard']} the guard, and {spurs['Forward']} the forward."
'The 2 players are: Parker the guard, and Duncan the forward.'
f'Numbers from 1-10 are {[_ for _ in range(1, 11)]}'
'Numbers from 1-10 are [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]'
# 小数精度
PI = 3.141592653
f"Pi is {PI:.2f}"
'Pi is 3.14'
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