将字符串转换为八进制数的最pythonic方法 [英] Most pythonic way to convert a string to a octal number
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问题描述
我希望使用存储在配置文件中的文件掩码更改文件的权限.由于 os.chmod() 需要一个八进制数,我需要将一个字符串转换为一个八进制数.例如:
I am looking to change permissions on a file with the file mask stored in a configuration file. Since os.chmod() requires an octal number, I need to convert a string to an octal number. For example:
'000' ==> 0000 (or 0o000 for you python 3 folks)
'644' ==> 0644 (or 0o644)
'777' ==> 0777 (or 0o777)
在明显的第一次尝试创建从 0000 到 0777 的每个八进制数并将其放入字典中并与字符串版本对齐后,我想出了以下内容:
After an obvious first attempt of creating every octal number from 0000 to 0777 and putting it in a dictionary lining it up with the string version, I came up with the following:
def new_oct(octal_string):
if re.match('^[0-7]+$', octal_string) is None:
raise SyntaxError(octal_string)
power = 0
base_ten_sum = 0
for digit_string in octal_string[::-1]:
base_ten_digit_value = int(digit_string) * (8 ** power)
base_ten_sum += base_ten_digit_value
power += 1
return oct(base_ten_sum)
有没有更简单的方法来做到这一点?
Is there a simpler way to do this?
推荐答案
您是否尝试过将基数 8 指定为 int
:
Have you just tried specifying base 8 to int
:
num = int(your_str, 8)
示例:
s = '644'
i = int(s, 8) # 420 decimal
print i == 0644 # True
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