Python format number with commas
I'm using python 2.5 so I don't have access to the built-in formatting. Show I looked at the Django code intcomma (intcomma_recurs in code below) and realized it's inefficient, because it's recursive and also compiling the regex on every run is not a good thing either. This is not necessary an 'issue' as django isn't really THAT focused on this kind of low-level performance. Also, I was expecting a factor of 10 difference in performance, but it's only 3 times slower. Out of curiosity I implemented a few versions of intcomma to see what the performance advantages are when using regex. My test data concludes a slight advantage for this task, but surprisingly not much at all. I also was pleased to see what I suspected: using the reverse xrange approach is unnecessary in the no-regex case, but it does make the code look slightly better at the cost of ~10% performance. Also, I assume what you're passing in is a string and looks somewhat like a number. Results undetermined otherwise.
And here are the test results:
How do you print numbers with commas as thousands separators?we can use my_string = '{:,. 2f}'. format(my_number) to convert float value into commas as thousands separators.
What is .2f in Python?2f is a placeholder for floating point number. So %d is replaced by the first value of the tuple i.e 12 and %. 2f is replaced by second value i.e 150.87612 .
How do you add a comma to a number in a Dataframe in Python?We use the python string format syntax '{:,. 0f}'. format to add the thousand comma separators to the numbers. Then we use python's map() function to iterate and apply the formatting to all the rows in the 'Median Sales Price' column.
How do you use thousand separator in Python?Using the modern f-strings is, in my opinion, the most Pythonic solution to add commas as thousand-separators for all Python versions above 3.6: f'{1000000:,}' . The inner part within the curly brackets :, says to format the number and use commas as thousand separators.
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