python变量名怎么写_如何在Python格式说明符中使用变量名称

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Is it possible to use a variable inside of a Python string formatting specifier?

I have tried:

display_width = 50

print('n{:^display_width}'.format('some text here'))

but get a ValueError: Invalid format specifier. I have also tried display_width = str(50)

however, just entering print('n{:^50}'.format('some text here')) works just fine.

解决方案

Yes, but you have to pass them in as arguments to format, and then refer to them wrapped in {} like you would the argument name itself:

print('n{:^{display_width}}'.format('some text here', display_width=display_width))

Or shorter but a little less explicit:

print('n{:^{}}'.format('some text here', display_width))

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