Pandas Dataframe - 将列乘以一个值

Question

I am trying to identify columns that contain the letter 'k', remove 'k' from the star rating column and multiply the result by 5.

When I multiply, instead of multiplying the column value, the value is repeated 5 times.

I've tried multiplying in other ways (use numpy, use * to multiply) but am getting the same result.

Any suggestions? Image of code: [ 1 ]

df_starrating ['StarRating'] = ['1.1k stars','900 stars','2.5k stars']

df_starrating['StarRating'] = df_starrating['StarRating'].str.replace('stars','')

if df_starrating['StarRating'].str.contains('k').any():
df_starrating['StarRating'] = df_starrating['StarRating'].str.replace('k','')
df_starrating['StarRating'] = df_starrating['StarRating'].multiply(5,axis = 'index')

Output:

1.1k, 1.1k, 1.1k, 1.1k, 1.1k

900,900,900,900,900

2.5,2.5,2.5,2.5,2.5

Answer 1

You can use the .apply(function) method. Something like this should work:

def reformat(s):
    if s.find('k')!=-1
        s=s.replace('k', '')
return float(s)*5

df_starrating['StarRating'] = df_starrating['StarRating'].apply(reformat)

Answer 2

I believe you are multiplying a string. Try converting to a float first eg

df_starrating['StarRating'] = df_starrating['StarRating'].astype(float).multiply(5,axis = 'index')