使用 float64 的熊猫最大小数位数

Question

I have a code where i read a data set as strings and what to convert it to float. As a string the values are something like this (The unit is Angstrom):

-11.22221784

when i now covert it via:

cols=[....a list of columns i want to convert]

for col in cols:
    df[col] = df[col].astype(float)

the value will become rounded to:

-11.222218

which i do not want!! if i convert it via

....
import decimal as D

for col in cols:
    df[col] = df[col].astype(D.Decimal)

i get the correct value in my dataframe but i can not plot the data as the dtype panas sees is object.

Answer 1

Pandas is rendering the column with 6 decimal places, it's storing it correctly:

In [11]: pd.Series([-11.22221784])
Out[11]:
0   -11.222218
dtype: float64

In [12]: pd.Series([-11.22221784])[0]
Out[12]: -11.22221784