pd.DataFrame cuts the decimals' mantissa

Question

Need to convert list of values with long mantissa into pd.DataFrame without precision lost:

My list of decimals:

The way pd.DataFrame convert it.

Answer 1

The values are stored with the correct precision, they are just truncated when you display them.

You can change the precision used by pandas when displaying datarames by using pd.set_option('display.precision', num_decimal_digits).

For example

df = pd.DataFrame([0.123456789])

print('Before setting precision:')
print(df)
pd.set_option('display.precision', 9)
print('After setting precision:')
print(df)

prints

Before setting precision:
          0
0  0.123457
After setting precision:
             0
0  0.123456789