问题描述
如何明确告诉 python 使用点或逗号作为小数分隔符读取十进制数?我不知道将运行我的脚本的 PC 的本地化设置,这应该不会影响我的应用程序,我只想说:
How can I explicitly tell python to read a decimal number using the point or the comma as a decimal separator? I don't know the localization settings of the PC that will run my script, and this should not influence my application, I only want to say:
f = read_float_with_point("3.14")
或
f = read_float_with_comma("3,14")
我认为写作
def read_float_with_comma(num): return float(num.replace(",", ".")
不安全,因为我不知道区域设置!
is not secure, because I don't know the locale settings!
推荐答案
因为我不知道区域设置
because I don't know the locale settings
您可以使用 locale 模块进行查找一个>:
You could look that up using the locale module:
>>> locale.nl_langinfo(locale.RADIXCHAR) '.'
或
>>> locale.localeconv()['decimal_point'] '.'
使用它,您的代码可以变成:
Using that, your code could become:
import locale _locale_radix = locale.localeconv()['decimal_point'] def read_float_with_comma(num): if _locale_radix != '.': num = num.replace(_locale_radix, ".") return float(num)
更好的是,同一个模块为您提供了一个转换功能,称为 atof():
Better still, the same module has a conversion function for you, called atof():
import locale def read_float_with_comma(num): return locale.atof(num)