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How can I read large text files in Python, line by line, without loading it into memory?
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@rochacbruno, it only reads one line at a time. When the next line is read, the previous one will be garbage collected unless you have stored a reference to it somewhere else
– John La Rooy
Jun 25 '11 at 2:33
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Add column with number of days between dates in DataFrame pandas
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Assuming these were datetime columns (if they're not apply to_datetime) you can just subtract them:
df['A'] = pd.to_datetime(df['A'])
df['B'] = pd.to_datetime(df['B'])
In [11]: df.dtypes # if already datetime64 you don't need to use to_datetime
O...
Is it better to use std::memcpy() or std::copy() in terms to performance?
...strings using all four SHA-2 versions (224, 256, 384, 512), and I loop 300 times. I measure times using Boost.timer. That 300 loop counter is enough to completely stabilize my results. I ran the test 5 times each, alternating between the memcpy version and the std::copy version. My code takes advant...
How to implement common bash idioms in Python? [closed]
...s are all aimed at python people who are afraid of (or don't want to spend time learning) bash, am I right?
– Buttle Butkus
Jul 13 '17 at 7:34
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C++ templates Turing-complete?
I'm told that the template system in C++ is Turing-complete at compile time. This is mentioned in this post and also on wikipedia .
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Is there any way to kill a Thread?
..._request flag that each threads checks on regular interval to see if it is time for it to exit.
For example:
import threading
class StoppableThread(threading.Thread):
"""Thread class with a stop() method. The thread itself has to check
regularly for the stopped() condition."""
def __...
Clean way to launch the web browser from shell script?
... major OS's as well as checking to ensure that a URL is passed in as a run-time variable:
#!/bin/bash
if [ -z $1 ]; then
echo "Must run command with the url you want to visit."
exit 1
else
URL=$1
fi
[[ -x $BROWSER ]] && exec "$BROWSER" "$URL"
path=$(which xdg-open || which gnome-open)...
Warning: “format not a string literal and no format arguments”
...l warning.. in a dynamic use of the language it's possible to do things runtime to the string (i.e. insert new information or even crash the program).. However it's possible to force suppress if you KNOW that it should be like this and you really don't want to be warned about it..
#pragma GCC diagn...
.htaccess redirect all pages to new domain
...writes? I suppose it wouldn't have any noticeable impact to re-write every time even though it isn't necessary. But why do it.
– Andrew
Mar 29 '16 at 2:20
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How do popular apps authenticate user requests from their mobile app to their server?
...The confusion that I have is regarding how to sign-up/login the user first time and authenticate it every time they make a request to the API.
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