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How to pad zeroes to a string?
... 2.6 + python 3
004
>>> print('{:03d}'.format(n)) # python >= 2.7 + python3
004
String formatting documentation.
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How do I exchange keys with values in a dictionary?
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From Python 2.7 on, including 3.0+, there's an arguably shorter, more readable version:
>>> my_dict = {'x':1, 'y':2, 'z':3}
>>> {v: k for k, v in my_dict.items()}
{1: 'x', 2: 'y', 3: 'z'}
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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
>>>...
Makefile经典教程（入门必备） - C/C++ - 清泛网 - 专注IT技能提升
...e的参数
下面列举了所有GNU make 3.80版的参数定义。其它版本和产商的make大同小异，不过其它产商的make的具体参数还是请参考各自的产品文档。
“-b”
“-m”
这两个参数的作用是忽略和其它版本make的兼容性。
“-B...