*Memo:
- My post explains format().
- My post explains Format Specification with format() (1).
- My post explains Format Specification with format() (2).
- My post explains Format Specification with format() (3).
- My post explains Format Specification with format() (5).
- My post explains format_map().
- My post explains f-strings.
- My post explains a string.
:[f][a][s][z][#][0][w][g][.p][t] can format a string with format() as shown below:
<Format a string with Decimal() by 'f' or 'F'>:
from decimal import Decimal v = Decimal(value='1234.5555555555') # | 10 | print(v) # 1234.5555555555 # | 10 | print('"{:.20f}"'.format(v)) print('"{:.20F}"'.format(v)) # "1234.55555555550000000000" # | 20 | print('"{:.15f}"'.format(v)) print('"{:.15F}"'.format(v)) # "1234.555555555500000" # | 15 | print('"{:.10f}"'.format(v)) print('"{:.10F}"'.format(v)) print('"{:f}"'.format(v)) print('"{:F}"'.format(v)) # "1234.5555555555" # | 10 | print('"{:.6f}"'.format(v)) print('"{:.6F}"'.format(v)) # "1234.555556" # | 6 | print('"{:.2f}"'.format(v)) print('"{:.2F}"'.format(v)) # "1234.56" print('"{:.1f}"'.format(v)) print('"{:.1F}"'.format(v)) # "1234.6" print('"{:.0f}"'.format(v)) print('"{:.0F}"'.format(v)) # "1235" print('"{:#.0f}"'.format(v)) print('"{:#.0F}"'.format(v)) # "1235." print('"{:,.20f}"'.format(v)) print('"{:,.20F}"'.format(v)) # "1,234.55555555550000000000" # | 20 | print('"{:,f}"'.format(v)) print('"{:,F}"'.format(v)) # "1,234.5555555555" # | 10 | print('"{:_.20f}"'.format(v)) print('"{:_.20F}"'.format(v)) print('"{:_f}"'.format(v)) print('"{:_F}"'.format(v)) # ValueError: invalid format string from decimal import Decimal print('"{:f} {:f}"'.format(Decimal(value='nan'), Decimal(value='inf'))) print('"{:F} {:F}"'.format(Decimal(value='nan'), Decimal(value='inf'))) # "NaN Infinity" *Decimal() without str gets an improper value.
from decimal import Decimal v = Decimal(value=1234.5555555555) # | 10 | print(v) # 1234.555555555499950060038827359676361083984375 # | 42 | print('"{:.20f}"'.format(v)) print('"{:.20F}"'.format(v)) # "1234.55555555549995006004" # | 20 | print('"{:.15f}"'.format(v)) print('"{:.15F}"'.format(v)) # "1234.555555555499950" # | 15 | print('"{:.10f}"'.format(v)) print('"{:.10F}"'.format(v)) # "1234.5555555555" # | 10 | print('"{:.6f}"'.format(v)) print('"{:.6F}"'.format(v)) # "1234.555556" # | 6 | print('"{:.2f}"'.format(v)) print('"{:.2F}"'.format(v)) # "1234.56" print('"{:.1f}"'.format(v)) print('"{:.1F}"'.format(v)) # "1234.6" print('"{:.0f}"'.format(v)) print('"{:.0F}"'.format(v)) # "1235" print('"{:#.0f}"'.format(v)) print('"{:#.0F}"'.format(v)) # "1235." print('"{:f}"'.format(v)) print('"{:F}"'.format(v)) # "1234.555555555499950060038827359676361083984375" # | 42 | print('"{:,.20f}"'.format(v)) print('"{:,.20F}"'.format(v)) # "1,234.55555555549995006004" # | 20 | print('"{:,f}"'.format(v)) print('"{:,F}"'.format(v)) # "1,234.555555555499950060038827359676361083984375" # | 42 | print('"{:_.20f}"'.format(v)) print('"{:_.20F}"'.format(v)) print('"{:_f}"'.format(v)) print('"{:_F}"'.format(v)) # ValueError: invalid format string from decimal import Decimal print('"{:f} {:f}"'.format(Decimal(value=float('nan')), Decimal(value=float('inf')))) print('"{:F} {:F}"'.format(Decimal(value=float('nan')), Decimal(value=float('inf')))) # "NaN Infinity" 
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