Dataframe 将浮点数转换为全小数的字符串

Question

by reading excel with pandas trying to convert floats to string with all decimal points

df = pd.read_excel('data/DHTest.xlsx',  keep_default_na=False, na_filter=False, dtype=str)

input in excel -0.00001 results to output in parquet -1e-05

--

if I try to run without dtype=str

df = pd.read_excel('data/DHTest.xlsx',  keep_default_na=False, na_filter=False, dtype=str)

results from -0.00001 to -0.00001 but by converting to string df = df.astype('string') creates again -1e-05

I need to write parquet with all columns as string df.to_parquet('data/DHTest.parquet') with output -0.00001 and not -1e-05

Answer 1

import pandas as pd
#Dummy Data
l = [0.0000001,0.00000002]
df = pd.DataFrame(l, columns=["data"])
-->
           data
0  1.000000e-07
1  2.000000e-08

#Transform (fixed number of zeros)
df["data"] = df["data"].map('{:,.8f}'.format)
-->
          data
0  0.00000010
1  0.00000002

#Transform (max number of zeros, but remove trailing)
df["data"] = df["data"].apply(lambda x: ('{:,.8f}'.format(x)).rstrip("0"))
-->
         data
0   0.0000001
1  0.00000002