python def round_to_two_significant_digits(number): if number == 0: return 0 else: return round(number, 2 - int(math.floor(math.log10(abs(number))) import math number = 123.456 rounded_number = round_to_two_significant_digits(number) print(rounded_number) # 输出: 120 2. 使用 decim...
>>> format(math.pi,'.12g')# give 12 significant digits'3.14159265359'>>> format(math.pi,'.2f')# give 2 digits after the point'3.14'>>> repr(math.pi)'3.141592653589793' 认识到这个幻觉的真相很重要:机器不能精确表达 1/10,你可以简单的截断 显示 真正的机器值。 一种幻觉可能招致另一个。例...
erDiagram float --|{ IEEE 754 double-precision format } IEEE 754 double-precision format --|{ 15 to 17 significant digits } IEEE 754 double-precision format --|{ Range from 10^-308 to 10^308 } float --|{ Precision issue } float --|{ Rounding error } 6. 序列图 下面是进行浮点数...
>>>format(math.pi,'.12g')# give 12 significant digits'3.14159265359'>>>format(math.pi,'.2f')# give 2 digits after the point'3.14'>>>repr(math.pi)'3.141592653589793' 认识到这,在真正意义上,是一种错觉是很重要的:你在简单地舍入真实机器值的显示。 例如,既然 0.1 不是精确的 1/10,3 个 ...
>>> format(math.pi, '.12g') # give 12 significant digits '3.14159265359' >>> format(math.pi, '.2f') # give 2 digits after the point '3.14' >>> repr(math.pi) '3.141592653589793' 1. 2. 3. 4. 5. 6. 7. 8. 认识到这,在真正意义上,是一种错觉是很重要的:你在简单地舍入真实机...
>>> format(math.pi,'.12g')#give 12 significant digits'3.14159265359'>>> format(math.pi,'.2f')#give 2 digits after the point'3.14'>>>repr(math.pi)'3.141592653589793' 必须重点了解的是,这在实际上只是一个假象:你只是将真正的机器码值进行了舍入操作再显示而已。
format_string("%d", x, grouping=True) '1,234,567' >>> locale.format_string("%s%.*f", (conv['currency_symbol'], ... conv['frac_digits'], x), grouping=True) '$1,234,567.80' 11.2. TemplatingThe string module includes a versatile Template class with a simplified syntax suitable ...
>>> format(math.pi,'.12g')#give 12 significant digits'3.14159265359'>>> format(math.pi,'.2f')#give 2 digits after the point'3.14'>>>repr(math.pi)'3.141592653589793' 必须重点了解的是,这在实际上只是一个假象:你只是将真正的机器码值进行了舍入操作再显示而已。
The first item in the tuple is 6, a numeric value that replaces %d in the format string. The next item is the string value "bananas", which replaces %s. The last item is the float value 1.74, which replaces %.2f.The resulting string is 6 bananas cost $1.74, as demonstrated in ...
significant digits. With no precision given, uses a precision of 6 digits after the decimal point for float, and shows all coefficient digits for Decimal. If no digits follow the decimal point, the decimal point is also removed unless