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How to get a list of column names on Sqlite3 database?
...w database version. Since I don't have some version saved, I need to check if certain column names exist.
18 Answers
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How to call erase with a reverse iterator
...e drawn to be pointing at. The diagram shows what element you would access if you * them, but we're talking about what element you'd be pointing at if you base them, which is one element to the right. I'm not such a fan of the --(i.base()) or (++i).base() solutions since they mutate the iterator. I ...
How to read from a file or STDIN in Bash?
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The following solution reads from a file if the script is called
with a file name as the first parameter $1 otherwise from standard input.
while read line
do
echo "$line"
done < "${1:-/dev/stdin}"
The substitution ${1:-...} takes $1 if defined otherwise
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How to check if an activity is the last one in the activity stack for an application?
I want to know if user would return to the home screen if he exit the current activity.
10 Answers
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How to copy yanked text to VI command prompt
I want to know if there is any way by which I can paste yanked text to the command window. For instance if I have yanked a word and I want to grep it in some location I can't simply paste the word using 'p'. However if I copy it to clipboard, Shift-Insert will paste the same thing.
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“for loop” with two variables? [duplicate]
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If you want the effect of a nested for loop, use:
import itertools
for i, j in itertools.product(range(x), range(y)):
# Stuff...
If you just want to loop simultaneously, use:
for i, j in zip(range(x), range(y)):
#...
How to get a complete list of object's methods and attributes?
...rns the keys in the __dict__ attribute, i.e. all the attributes accessible if the __getattr__ method is not reimplemented.
For the second question, it does not really make sense. Actually, methods are callable attributes, nothing more. You could though filter callable attributes, and, using the ins...
HTML form readonly SELECT tag/input
... HTML doesn't have a readonly attribute, only a disabled attribute. So if you want to keep the user from changing the dropdown, you have to use disabled .
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How to determine whether a Pandas Column contains a particular value
...y in a Pandas column that has a particular value. I tried to do this with if x in df['id'] . I thought this was working, except when I fed it a value that I knew was not in the column 43 in df['id'] it still returned True . When I subset to a data frame only containing entries matching the missi...
What to do with branch after merge
...ranch1
Additionally, git will warn you (and refuse to delete the branch) if it thinks you didn't fully merge it yet. If you forcefully delete a branch (with git branch -D) which is not completely merged yet, you have to do some tricks to get the unmerged commits back though (see below).
There are...