从字符串中提取科学计数法

Question

I am trying to extract scientific notation from strings like:

`#DataCGSConversionFactor[0] = 1.0051900924519e-29`

Unfortunately because of the first 0 that isn't a part of the number I want, the other solutions I have tried don't work, giving:

ValueError: invalid literal for float(): 0]

Thanks in advance.

Answer 1

For the string you show,

x = "#DataCGSConversionFactor[0] = 1.0051900924519e-29"

f = float(x.split()[-1])    # split at spaces, take last item, and cast to a float

print f, type(f)
# 1.0051900924519e-29, float