如何在 python3.x 中格式化多个打印的数字？

Question

我希望能够以某种方式格式化一个数字，并让我调用的每个打印函数都以这种方式输出，而不是在每个打印函数中重新格式化它。我只是将其视为一种清理代码的方法。这是一个例子：

给定变量：

weight = mass * conversion_const

并说它的结果超过小数点后 2 位。

那我要打印：

print('The mass of the load is %s Newtons, which is too heavy' %(format(weight, ',.2f')))
print('The mass of the load is %s Newtons, which is too light' %(format(weight, ',.2f')))
print('The mass of the load is %s Newtons, which is just right' %(format(weight, ',.2f')))
print('The mass of the load is %s Newtons, which is wayy to heavy' %(format(weight, ',.2f')))

这只是一个示例，如果我要创建需要这些响应的东西，它将在 if 语句中，但正如您所见，无论哪种方式，我都必须每次都格式化相同的变量。我怎样才能避免这种情况？

Answer 1

常用格式码的提取方法有很多，例如：

ANSWER_FORMAT = 'The mass of the load is {0:,2f} Newtons, which is {1}'
format_answer = ANSWER_FORMAT.format

print(format_answer(right_weight, 'just_right'))
print(format_answer(heavy_weight, 'too heavy'))

（请注意，新的格式样式如何让生活更轻松。）

Answer 2

weight = "%.2f"%(mass * conversion_const)

print('The mass of the load is %s Newtons, which is too heavy'%(weight))
print('The mass of the load is %s Newtons, which is too light'%(weight))
print('The mass of the load is %s Newtons, which is just right'%(weight))
print('The mass of the load is %s Newtons, which is way to heavy'%(weight))

甚至更好：

weight = "The mass of the load is %.2f Newtons, which is "%(mass * conversion_const)

print(weight + 'too heavy')
print(weight + 'too light')
print(weight + 'just right')
print(weight + 'way too heavy')

Answer 3

格式化一次，将格式化后的字符串存储在一个变量中，然后使用该变量。