取消从decimal.Decimal到字符串的科学表示法

from decimal import Decimal

number = Decimal('1230000000000')
string_representation = '{:f}'.format(number)
print(string_representation)  # 输出："1230000000000"

number = Decimal('0.00000000000123')
string_representation = '{:f}'.format(number)
print(string_representation)  # 输出："0.00000000000123"

from decimal import Decimal, Context

number = Decimal('1230000000000')
context = Context(prec=28, Emin=-999999, Emax=999999, capitals=1,
                  clamp=0, flags=[], traps=[], round=Context().ROUND_DOWN)
string_representation = number.to_eng_string(context=context)
print(string_representation)  # 输出："1230000000000"

number = Decimal('0.00000000000123')
string_representation = number.to_eng_string(context=context)
print(string_representation)  # 输出："0.00000000000123"