How to insert a comma as a thousands separator in a pandas dataframe column?

Question

I\'m trying to format the Dollar Amount column to have a comma thousands separator for easier viewing, but I haven\'t been able to figure it out. Can someone please show me

Answer 1

If you need to insert thousands comma separators in a specific column and remove the decimal place:

import pandas as pd
df = pd.DataFrame([(0.21, 1000.0), (0.01, 2000000.0), (0.66, 1000.0), (0.21, 330000.0)], columns=['A', 'B'])

Before:

      A          B
0  0.21     1000.0
1  0.01  2000000.0
2  0.66     1000.0
3  0.21   330000.0

For "Col B" insert comma separators and remove decimal place: A slight adjustment to YOBEN_S's code above gives:

lst = list(df.columns)
lst.remove('A')
for c in lst:
    df[c] = df[c].astype(int).apply(lambda x: f'{x:,}')

After:

      A          B
0  0.21      1,000
1  0.01  2,000,000
2  0.66      1,000
3  0.21    330,000