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How to get all possible combinations of a list’s elements?
...s.combinations(iterable, r)
Return r length subsequences of elements from
the input iterable.
Combinations are emitted in lexicographic sort order. So, if the
input iterable is sorted, the
combination tuples will be produced in
sorted order.
Since 2.6, batteries are included!
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Character reading from file in Python
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Ref: http://docs.python.org/howto/unicode
Reading Unicode from a file is therefore simple:
import codecs
with codecs.open('unicode.rst', encoding='utf-8') as f:
for line in f:
print repr(line)
It's also possible to open files in update mode, allowing both reading and ...
Why does changing the returned variable in a finally block not change the return value?
... terminate abruptly because of return statements, then the following rules from §14.20.2 apply:
If execution of the try block completes abruptly for any other reason R [besides throwing an exception], then the finally block is executed, and then there is a choice:
If the finally block completes n...
getting the screen density programmatically in android?
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You can get info on the display from the DisplayMetrics struct:
DisplayMetrics metrics = getResources().getDisplayMetrics();
Though Android doesn't use a direct pixel mapping, it uses a handful of quantized Density Independent Pixel values then scales to...
How to capture stdout output from a Python function call?
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Try this context manager:
from io import StringIO
import sys
class Capturing(list):
def __enter__(self):
self._stdout = sys.stdout
sys.stdout = self._stringio = StringIO()
return self
def __exit__(self, *args):
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Grouping functions (tapply, by, aggregate) and the *apply family
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@grautur I was actively pruning things from this answer to avoid it being (a) too long and (b) a re-write of the documentation. I decided that while aggregate, by, etc. are based on *apply functions, the way you approach using them is different enough from a users...
How does this checkbox recaptcha work and how can I use it?
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This is a beta API for reCAPTCHA. I gather this from the source of their JS API: https://www.google.com/recaptcha/api.js referencing "API2". And I also found this: http://jaswsinc.com/recaptcha-ads/ Apparently they did an invite-only beta of their "no CAPTCHA reCAPTCHA" So...
Exiting from python Command Line
To exit from Python command line, I have to type exit(). If I type exit, it says
11 Answers
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How to remove leading zeros from alphanumeric text?
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You can use the StringUtils class from Apache Commons Lang like this:
StringUtils.stripStart(yourString,"0");
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Can a Windows batch file determine its own file name?
...sed, %0 will have that. If you cd into the dir first and execute the batch from there, %0 will usually not have the path info (but you could get that from %cd% in that case)
– Gogowitsch
Jul 9 '15 at 8:51
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