I am dealing with text strings such as the following:
LN1 2DW, DN21 5BJ, DN21 5BL, ...
In Python, how can I count the number of elements between commas? Each element can be made of 6, 7, or 8 characters, and in my example there are 3 elements shown. The separator is always a comma.
I have never done anything related to text mining so this would be a start for me.
You can count the number of commas:
text.count(",") + 1
# 3
ipython and its %timeit built-in. Results: text.count(',')+1: 665 ns ± 3.06 ns per loop len(text.split(',')): 3.59 µs ± 19.3 ns per loop Tested data was a list of 91 elements.If the comma (,) is the separator, you can simply use str.split on the string and then len(..) on the result:
text = 'LN1 2DW, DN21 5BJ, DN21 5B'
number = len(text.split(','))
You can also reuse the list of elements. For instance:
text = 'LN1 2DW, DN21 5BJ, DN21 5B'
tags = text.split(',')
number = len(tags)
#do something with the `tags`
.strip etc. to simply post-process every element.Willien and Psidom already mentioned count,
I just wanted to add that in python a string is also iteratable, thus list comprehension could also be applied:
n = len([c for c in ','+text if c==','])
Or
n = sum(1 for c in ','+text if c==',')
len(list(filter(lambda x: ord(x) == 44, text)))+1 too but it really doesn't add anything