Replace comma with dot Pandas

Question

Given the following array, I want to replace commas with dots:

array(['0,140711', '0,140711', '0,0999', '0,0999', '0,001', '0,001',
       '0,140711', '0,140711', '0,140711', '0,140711', '0,140711',
       '0,140711', 0L, 0L, 0L, 0L, '0,140711', '0,140711', '0,140711',
       '0,140711', '0,140711', '0,1125688', '0,140711', '0,1125688',
       '0,140711', '0,1125688', '0,140711', '0,1125688', '0,140711',
       '0,140711', '0,140711', '0,140711', '0,140711', '0,140711',
       '0,140711', '0,140711', '0,140711', '0,140711', '0,140711',
       '0,140711', '0,140711', '0,140711', '0,140711', '0,140711',
       '0,140711', '0,140711', '0,140711', '0,140711'], dtype=object)

I’ve been trying different ways but I can’t figure out how to do this.
Also, I have imported it as a pandas DataFrame but can’t apply the function:

df
      1-8        1-7
H0   0,140711   0,140711
H1     0,0999     0,0999
H2      0,001      0,001
H3   0,140711   0,140711
H4   0,140711   0,140711
H5   0,140711   0,140711
H6          0          0
H7          0          0
H8   0,140711   0,140711
H9   0,140711   0,140711
H10  0,140711  0,1125688
H11  0,140711  0,1125688
H12  0,140711  0,1125688
H13  0,140711  0,1125688
H14  0,140711   0,140711
H15  0,140711   0,140711
H16  0,140711   0,140711
H17  0,140711   0,140711
H18  0,140711   0,140711
H19  0,140711   0,140711
H20  0,140711   0,140711
H21  0,140711   0,140711
H22  0,140711   0,140711
H23  0,140711   0,140711 

df.applymap(lambda x: str(x.replace(',','.')))

Any suggestions how to solve this?

Asked By: Juliana Rivera

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Source

Answer 1

You need to assign the result of your operate back as the operation isn’t inplace, besides you can use apply or stack and unstack with vectorised str.replace to do this quicker:

In [5]:
df.apply(lambda x: x.str.replace(',','.'))

Out[5]:
          1-8        1-7
H0   0.140711   0.140711
H1     0.0999     0.0999
H2      0.001      0.001
H3   0.140711   0.140711
H4   0.140711   0.140711
H5   0.140711   0.140711
H6          0          0
H7          0          0
H8   0.140711   0.140711
H9   0.140711   0.140711
H10  0.140711  0.1125688
H11  0.140711  0.1125688
H12  0.140711  0.1125688
H13  0.140711  0.1125688
H14  0.140711   0.140711
H15  0.140711   0.140711
H16  0.140711   0.140711
H17  0.140711   0.140711
H18  0.140711   0.140711
H19  0.140711   0.140711
H20  0.140711   0.140711
H21  0.140711   0.140711
H22  0.140711   0.140711
H23  0.140711   0.140711

In [4]:    
df.stack().str.replace(',','.').unstack()

Out[4]:
          1-8        1-7
H0   0.140711   0.140711
H1     0.0999     0.0999
H2      0.001      0.001
H3   0.140711   0.140711
H4   0.140711   0.140711
H5   0.140711   0.140711
H6          0          0
H7          0          0
H8   0.140711   0.140711
H9   0.140711   0.140711
H10  0.140711  0.1125688
H11  0.140711  0.1125688
H12  0.140711  0.1125688
H13  0.140711  0.1125688
H14  0.140711   0.140711
H15  0.140711   0.140711
H16  0.140711   0.140711
H17  0.140711   0.140711
H18  0.140711   0.140711
H19  0.140711   0.140711
H20  0.140711   0.140711
H21  0.140711   0.140711
H22  0.140711   0.140711
H23  0.140711   0.140711

the key thing here is to assign back the result:

df = df.stack().str.replace(',','.').unstack()

Answered By: EdChum

Answer 2

If you are reading in with read_csv, you can specify how it interprets decimals with the decimal parameter.

e.g.

your_df = pd.read_csv('/your_path/your_file.csv',sep=';',decimal=',')

From the man pages:

thousands : str, optional

Thousands separator.

decimal : str, default ‘.’

Character to recognize as decimal point
(e.g. use ‘,’ for European data).

Answered By: atomh33ls

Answer 3

If you need to replace commas with dots in particular columns, try

    data["column_name"]=data["column_name"].str.replace(',','.')

to avoid ‘str’ object has no attribute ‘str’ error.

Answered By: Swathi

Replace comma with dot Pandas

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