在Julia中插入时如何格式化字符串? [英] How do you format a string when interpolated in Julia?

问题描述

在Python 3中，我会

In Python 3, I would

print_me = "Look at this significant figure formatted number: {:.2f}!".format(floating_point_number)
print(print_me)

或

print_me = f"Look at this significant figure formatted number: {floating_point_number:.2f}!"
print(print_me)

在朱莉娅

print_me = "Look at this significant figure formatted number: $floating_point_number"
print(print_me)

但这会产生说出的声音

Look at this significant figure formatted number: 61.61616161616161

我如何让Julia限制显示的小数位数?请注意，据我所知，使用@printf宏排除了要打印的字符串的必要存储.

How do I get Julia to restrict the number of decimal places it displays? Note that the necessary storage of the string to be printed, to my knowledge, rules out using the @printf macro.

这有效，但在样式上似乎不正确.

This works, but does not seem stylistically correct.

floating_point_number = round(floating_point_number,2)
print_me = "Look at this significant figure formatted number: $floating_point_number"
print(print_me)

推荐答案

您可以使用标准库包Printf中的@sprintf宏.这将返回一个字符串，而不仅仅是将其打印为@printf.

You can use @sprintf macro from the standard library package Printf. This returns a string rather than just printing it as @printf.

using Printf
x = 1.77715
print("I'm long: $x, but I'm alright: $(@sprintf("%.2f", x))")

输出:

I'm long: 1.77715, but I'm alright: 1.78

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