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)
这篇关于使用逗号或点作为分隔符将 Python 字符串显式转换为浮点数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持跟版网！