CODEWITHSUNDEEP
pythonprinting
loveprint
loveprint

Reputation: 11

Single '}' possible encountered in format string

is it possible to concat string when using .format()?

_NACHKOMMASTELLEN = 3

print("  {0:." + str(_NACHKOMMASTELLEN) + "f}".format(round(V_values[0], _NACHKOMMASTELLEN)), end='')

I get the error:

Single '}' encountered in format string

Upvotes: 1

Views: 951

Answers (2)

Patrick Artner
Patrick Artner

Reputation: 51683

If you are below 3.6 you can double-format:

_NKS = 3   # shortened for 79 line char limit
V_values = [3.123456789]
print("  {{:.{}f}}".format(_NKS ).format(round(V_values[0], _NKS )))

The first format puts the 3 inplace of {} and converts the double {{ and}} to single { and } - the resulting string {:.3f} is then used for the second format .

As pointed out by @user2357112 in the comment, format is better then I though. This just works as well:

print("  {:.{}f}".format(round(V_values[0], _NKS ),_NKS ))

Output:

  3.123

You do not need to if you already use 3.6 - f-strings deal better with it:

_NACHKOMMASTELLEN = 3
V_values = [3.123456789]
print(f"  {round(V_values[0], _NACHKOMMASTELLEN):.{_NACHKOMMASTELLEN}f}")
V_values = [3.1]
print(f"  {round(V_values[0], _NACHKOMMASTELLEN):.{_NACHKOMMASTELLEN}f}")

Output:

  3.123
  3.100

Upvotes: 1

vishes_shell
vishes_shell

Reputation: 23534

You need to wrap your string in parenthesis:

print(("  {0:." + str(_NACHKOMMASTELLEN) + "f}").format(round(V_values[0], _NACHKOMMASTELLEN)), end='')
      ^                                        ^

So that " {0:." + str(_NACHKOMMASTELLEN) + "f}" will be formated instead of "f}"

Upvotes: 1

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