如何在Python中将字符串转换为双精度？

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问题：如何在Python中将字符串转换为双精度？

我想知道如何将包含数字的字符串转换为双精度型。

I would like to know how to convert a string containing digits to a double.

>>> x = "2342.34"
>>> float(x)
2342.3400000000001

妳去使用float（其行为类似于C，C ++或Java double，并且具有相同的精度）。

>>> x = "2342.34"
>>> float(x)
2342.3400000000001

There you go. Use float (which behaves like and has the same precision as a C,C++, or Java double).

十进制运算符可能更符合您的要求：

>>> from decimal import Decimal
>>> x = "234243.434"
>>> print Decimal(x)
234243.434

The decimal operator might be more in line with what you are looking for:

>>> from decimal import Decimal
>>> x = "234243.434"
>>> print Decimal(x)
234243.434

请注意，如果您的字符串数字包含的有效位数超过15个，float(s)则将其取整。在这种情况下，最好使用Decimal

Be aware that if your string number contains more than 15 significant digits float(s) will round it.In those cases it is better to use Decimal