Formatting a concatenated python string

Question

It seems as if string formatting doesn't work on concatenated strings. With concatenation the place holder gets printed literally:

>>> print("{}" + " OK".format("Text"))
{} OK

However, without concatenation the format gets printed as it should:

>>> print("{} OK".format("Text"))
Text OK

The same problem occurs with old-style %-formatting.

If I have a long multi-line string where I would like to concatenate a string that should be formatted, what is the recommended way?

Answer 1

You were attempting to perform the "format" operation prior to doing the concatenation. You can fix the precedence of operations by using parentheses:

>>> the_string = ("{}" + " OK").format("Text")
>>> print(the_string)
Text OK

Answer 2

您只需要修复括号：

print(("{}" + " OK").format("Text"))