问题
I have a python list with strings in this format:
A1 = [' "29.0" ',' "65.2" ',' "75.2" ']
How do I convert those strings into decimal numbers to perform arithmetic operations on the list elements?
回答1:
If you want the result as the nearest binary floating point number use float:
result = [float(x.strip(' "')) for x in A1]
If you want the result stored exactly use Decimal instead of float:
from decimal import Decimal
result = [Decimal(x.strip(' "')) for x in A1]
回答2:
You will need to use strip() because of the extra bits in the strings.
A2 = [float(x.strip('"')) for x in A1]
回答3:
use the built in float() function in a list comprehension.
A2 = [float(v.replace('"','').strip()) for v in A1]
回答4:
If you are converting price (in string) to decimal price then....
from decimal import Decimal
price = "14000,45"
price_in_decimal = Decimal(price.replace(',',''))
回答5:
A2 = [float(x.strip('"')) for x in A1] works, @Jake , but there are unnecessary 0s
回答6:
If you are converting string to float:
import re
A1 = [' "29.0" ',' "65.2" ',' "75.2" ']
float_values = [float(re.search(r'\d+.\d+',number).group()) for number in A1]
print(float_values)
>>> [29.0, 65.2, 75.2]
来源：https://stackoverflow.com/questions/4643991/python-converting-string-into-decimal-number