Using variables in the format() function in Python

Question

Is it possible to use variables in the format specifier in the format()-function in Python? I have the following code, and I need VAR to equal field_size:

def pretty_printer(*numbers):
  str_list = [str(num).lstrip('0') for num in numbers]

  field_size = max([len(string) for string in str_list])

  i = 1
  for num in numbers:
    print("Number", i, ":", format(num, 'VAR.2f')) # VAR needs to equal field_size

Answer 1

I prefer this (new 3.6) style:

name = 'Eugene'
f'Hello, {name}!'

or a multi-line string:

f'''
Hello,
{name}!!!
{a_number_to_format:.1f}
'''

which is really handy.

I find the old style formatting sometimes hard to read. Even concatenation could be more readable. See an example:

'{} {} {} {} which one is which??? {} {} {}'.format('1', '2', '3', '4', '5', '6', '7')

Answer 2

I used just assigned the VAR value to field_size and change the print statement. It works.

def pretty_printer(*numbers):
  str_list = [str(num).lstrip('0') for num in numbers]

  field_size = max([len(string) for string in str_list])

  VAR=field_size

  i = 1
  for num in numbers:
      print("Number", i, ":", format(num, f'{VAR}.2f'))