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Python speed testing - Time Difference - milliseconds
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Since Python 2.7 there's the timedelta.total_seconds() method. So, to get the elapsed milliseconds:
>>> import datetime
>>> a = datetime.datetime.now()
>>> b = datetime.datetime.now()
>>> delta = b - a...
Finding last occurrence of substring in string, replacing that
... the parameter is omitted the function will give an error (tried in Python 2.7). I would suggest either remove the default value, set it to -1 (for unlimited replacements) or better make it replacements=1 (which I think should be the default behaviour for this particular function according to what t...
subtract two times in python
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using python 2.7, I don't have combine method in my datetime module: AttributeError: 'module' object has no attribute 'combine'
– mtoloo
Jul 28 '16 at 12:32
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Format numbers to strings in Python
...m" if hours > 12 else "am"}'
or the str.format function starting with 2.7:
"{:02}:{:02}:{:02} {}".format(hours, minutes, seconds, "pm" if hours > 12 else "am")
or the string formatting % operator for even older versions of Python, but see the note in the docs:
"%02d:%02d:%02d" % (hours, ...
Unzipping files in Python
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ZipFile also works as a context manager in 2.7 or later: docs.python.org/2/library/zipfile.html#zipfile.ZipFile
– FelixEnescu
Jan 22 '17 at 15:01
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Extract date (yyyy/mm/dd) from a timestamp in PostgreSQL
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This works for me in python 2.7
select some_date::DATE from some_table;
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How to disable python warnings
...can also define an environment variable (new feature in 2010 - i.e. python 2.7)
export PYTHONWARNINGS="ignore"
Test like this: Default
$ export PYTHONWARNINGS="default"
$ python
>>> import warnings
>>> warnings.warn('my warning')
__main__:1: UserWarning: my warning
>>>...
Currency formatting in Python
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New in 2.7
>>> '{:20,.2f}'.format(18446744073709551616.0)
'18,446,744,073,709,551,616.00'
http://docs.python.org/dev/whatsnew/2.7.html#pep-0378
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How can I selectively escape percent (%) in Python strings?
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@Zenadix This is true in Python 2.7 as well
– Tom
Dec 15 '15 at 18:17
2
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Accessing class variables from a list comprehension in the class definition
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Python 2.x uses inline bytecode there instead, here is output from Python 2.7:
2 0 LOAD_NAME 0 (__name__)
3 STORE_NAME 1 (__module__)
3 6 LOAD_CONST 0 (5)
9 STORE_NAME 2 (x)
4 ...