question Re: How to remove the space and dots and convert into lowercase in Pyspark in Support Questions

How to remove the space and dots and convert into lowercase in Pyspark

suri789 — Fri, 10 Jun 2022 01:54:05 GMT

I have a pyspark dataframe with names like

N. Plainfield
North Plainfield
West Home Land
NEWYORK
newyork
So. Plainfield
S. Plaindield

Some of them contain dots and spaces between initials and some do not. How can they be converted to:

n Plainfield
north plainfield
west homeland
newyork
newyork
so plainfield
s plainfield

(with no dots and spaces between initials and 1 space between initials and name)

I tried using the following but it only replaces dots and doesn't remove spaces between initials:

names_modified = names.withColumn("name_clean", regexp_replace("name", r"\.",""))

After removing the whitespaces and dots is there any way get the distinct values.
like this.

north plainfield
west homeland
newyork
so plainfield

Re: How to remove the space and dots and convert into lowercase in Pyspark

jagadeesan — Wed, 15 Jun 2022 17:41:51 GMT

Hi @suri789 Can you try this below and share your feedback?

>>> df.show()
+----------------+
| value          |
+----------------+
| N. Plainfield|
|North Plainfield|
| West Home Land|
| NEWYORK|
| newyork|
| So. Plainfield|
| S. Plaindield|
| s Plaindield|
|North Plainfield|
+----------------+
>>> from pyspark.sql.functions import regexp_replace, lower
>>> df_tmp=df.withColumn('value', regexp_replace('value', r'\.',''))
>>> df_tmp.withColumn('value', lower(df_tmp.value)).distinct().show()
+----------------+
| value          |
+----------------+
| s plaindield|
| n plainfield|
| west home land|
| newyork|
| so plainfield|
|north plainfield|
+----------------+

Re: How to remove the space and dots and convert into lowercase in Pyspark

suri789 — Thu, 30 Jun 2022 12:05:14 GMT

Thanks jagadeesan,

But Still your getting the duplicate values

Re: How to remove the space and dots and convert into lowercase in Pyspark

suri789 — Thu, 30 Jun 2022 12:05:59 GMT

so plainfield, s plainfiled both are same

Re: How to remove the space and dots and convert into lowercase in Pyspark

jagadeesan — Thu, 30 Jun 2022 14:27:06 GMT

Hi @suri789 these both are different values, I didn't see any duplicate in these.

so plainfield

s plainfiled

Also from the output, I didn't see any duplicate values, all are distinct by the values..!

+----------------+
| value          |
+----------------+
| s plaindield|
| n plainfield|
| west home land|
| newyork|
| so plainfield|
|north plainfield|
+----------------+

Please note: "n plainfield & north plainfield or s plainfield & so plainfield" are different values, because we didn't write any custom logic like 'n' means 'north' or 's' means 'so'.