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Why is my git repository so big?
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I recently pulled the wrong remote repository into the local one (git remote add ... and git remote update). After deleting the unwanted remote ref, branches and tags I still had 1.4GB (!) of wasted space in my repository. I was only able to get rid of this by cloning it with git clo...
Delete column from pandas DataFrame
...1', 'Col2', ...]
df.drop(columns, inplace=True, axis=1)
This will delete one or more columns in-place. Note that inplace=True was added in pandas v0.13 and won't work on older versions. You'd have to assign the result back in that case:
df = df.drop(columns, axis=1)
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How to use null in switch
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cleaner way than using one extra if else
– Vivek Agrawal
Nov 15 '19 at 10:28
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How to “properly” print a list?
...element of mylist, creating a new list of strings that is then joined into one string with str.join(). Then, the % string formatting operator substitutes the string in instead of %s in "[%s]".
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Getting a map() to return a list in Python 3.x
...eneralizations
UPDATE
Always seeking for shorter ways, I discovered this one also works:
*map(chr, [66, 53, 0, 94]),
Unpacking works in tuples too. Note the comma at the end. This makes it a tuple of 1 element. That is, it's equivalent to (*map(chr, [66, 53, 0, 94]),)
It's shorter by only one ...
How do I find the most recent git commit that modified a file?
...all it like this:
git log my/file.c
If you really only want to list the one most recent commit, for example to use it in a script, use the -n 1 option:
git log -n 1 --pretty=format:%H -- my/file.c
--pretty=format:%h tells git log to show only the commit hash. The -- separater stops the file na...
ActiveRecord: size vs count
...f you're dealing with more complex queries is there any advantage to using one method over the other? How are they different?
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What is the correct syntax for 'else if'?
...hon programmer who is making the leap from 2.6.4 to 3.1.1. Everything has gone fine until I tried to use the 'else if' statement. The interpreter gives me a syntax error after the 'if' in 'else if' for a reason I can't seem to figure out.
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What is the effect of extern “C” in C++?
...s are distinct types even if otherwise identical
Linkage specs nest, inner one determines the final linkage
extern "C" is ignored for class members
At most one function with a particular name can have "C" linkage (regardless of namespace)
extern "C" forces a function to have external linkage (cannot...
Preventing Laravel adding multiple records to a pivot table
...resence of an existing record by writing a very simple condition like this one :
if (! $cart->items->contains($newItem->id)) {
$cart->items()->save($newItem);
}
Or/and you can add unicity condition in your database, it would throw an exception during an attempt of saving a doub...