ValueError：无法将字符串转换为float：'7.112,9'（Pandas）

Question

I have this data from .csv

bitcoin[['Dernier']] = bitcoin[['Dernier']].astype(float)

if copy or is_object_dtype(arr) or is_object_dtype(dtype):

# Explicit copy, or required since NumPy can't view from / to object.
return arr.astype(dtype, copy=True)
return arr.view(dtype)

输出：

ValueError：无法将字符串转换为float：'7.112,9'