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How do I convert seconds to hours, minutes and seconds?
...ossible to use time.strftime, which gives more control over formatting:
from time import strftime
from time import gmtime
strftime("%H:%M:%S", gmtime(666))
'00:11:06'
strftime("%H:%M:%S", gmtime(60*60*24))
'00:00:00'
gmtime is used to convert seconds to special tuple format that strftime() re...
How to migrate back from initial migration in Django 1.7?
...also:
python manage.py migrate <app> zero
This clears <app> from migration history and drops all tables of <app>
See django docs for more info.
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Converting stream of int's to char's in java
...se InputStreamReader with the appropriate Charset instead.
Simply casting from int to char only works if you want ISO-8859-1, if you're reading bytes from a stream directly.
EDIT: If you are already using a Reader, then casting the return value of read() to char is the right way to go (after check...
How to reference a method in javadoc?
...member label}
tag (that you are looking for). The corresponding example from the documentation is as follows
For example, here is a comment that refers to the getComponentAt(int, int) method:
Use the {@link #getComponentAt(int, int) getComponentAt} method.
The package.class part can be...
Zero-based month numbering [closed]
...
The use of zero to start counting is actually an optimization trick from Assembly programmers. Instead of assigning 1 to the count register, they XOR'ed the register with itself, which was slightly faster in CPU cycles. This meant that counting would start with 0 and would always be up to the...
Why do we use volatile keyword? [duplicate]
...f some_int, so it may be tempted to optimize the while loop by changing it from while(some_int == 100) to something which is equivalent to while(true) so that the execution could be fast (since the condition in while loop appears to be true always). (if the compiler doesn't optimize it, then it has ...
connecting to MySQL from the command line
How can you connect to MySQL from the command line in a Mac? (i.e. show me the code)
6 Answers
...
Find lines from a file which are not present in another file [duplicate]
...le1) <(sort -u file2)
Solution 2: (the first "working" answer I found) from unix.stackexchange:
fgrep -v -f file1 file2
Note that if file2 contains duplicate lines that don't exist at all in file1, fgrep will output each of the duplicate lines. Also note that my totally non-scientific tests on...
How to get the last N records in mongodb?
...een documented this. By default, the find() operation will get the records from beginning. How can I get the last N records in mongodb?
...
Format numbers in django templates
...a dollar sign. This goes somewhere like my_app/templatetags/my_filters.py
from django import template
from django.contrib.humanize.templatetags.humanize import intcomma
register = template.Library()
def currency(dollars):
dollars = round(float(dollars), 2)
return "$%s%s" % (intcomma(int(d...