从 Python 中的字符串中提取坐标

Question

I have this column in my DataFrame

df['Y']

0      -37.025.753

1      -37.024.621

2      -37.056.739

          ...     

214     -3.702.631

215    -37.025.369

Name: Longitud, Length: 216, dtype: object

1.I tried this:

df['Y'] = df.Y.str.rsplit(".",1).str[0]

and I get this:

df['Y']
0      -37.025

2.I tried this:

df["Y"] = df["Y"].str.extract("(.+)\.[0-9]+")

and I get this:

df['Y']
0      -37.025

But I would like change dtype in float with 8 decimal like this:

df['Y']

0      -37.025753

Answer 1

You could use a more explicit pattern

df['Y'] = df['Y'].str.extract(r"(-*[0-9]+\.[0-9]+\.[0-9]+)")
#0  -37.025.753

then remove the full stop you don't want, and convert to float:

df['Y'] = df['Y'].str.replace(r"\.([0-9]{3}$)",r"\1").astype('float64')
#0    -37.025753