How can I change a string into a floating-point number in Python?

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日期：2018.5.30引用：[Stack Overflow](https://stackoverflow.com/questions/482410/how-do-i-convert-a-string-to-a-double-in-python)方法1：pi=3.1415926 float(pi)方法2：from decimal import Decimal x=Decimal(234243.434)

Date: 2018.5.30

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Reference:

​​stackoverflow.com/questions/482410/how-do-i-convert-a-string-to-a-double-in-python​​

Method1:

pi = ‘3.1415926’
float(pi)
3.1415926

Method2:

from decimal import Decimal
x = “234243.434”
print Decimal(x)
234243.434