How to efficiently append values to an empty list in Python?

Question

I have the following code

entries = soup.find_all("entry")

master_list_xml = []

for entry in entries:
         accession_num = entry.find("accession-number").text
         print(accession_num)

Output is:

0001564590-18-019062
0001564590-17-014900
0001193125-16-662209
0001193125-15-272806

Now, I want to make a list containing every accession_num.

Question: What is the most efficient way to do it?

Kindly mark my solution as your answer and vote up too.

Ali Hassan
– Ali Hassan

2020-06-05 11:59:03 +00:00
Commented Jun 5, 2020 at 11:59 — Ali Hassan
– Ali Hassan, Commented Jun 5, 2020 at 11:59

tzaman · Accepted Answer · 2020-06-05 11:30:27Z

2

This is what list comprehensions are for:

entries = soup.find_all("entry")
accession_numbers = [entry.find("accession-number").text for entry in entries]

answered Jun 5, 2020 at 11:30

tzaman

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Ali Hassan · Accepted Answer · 2020-06-05 11:29:16Z

1

Add this line master_list_xml.append(accession_num) in loop, this will create a List.

entries = soup.find_all("entry")

master_list_xml = []

for entry in entries:
         accession_num = entry.find("accession-number").text
         print(accession_num)
         master_list_xml.append(accession_num)

answered Jun 5, 2020 at 11:29

Ali Hassan

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