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Convert Pandas column containing NaNs to dtype `int`
I read data from a .csv file to a Pandas dataframe as below. For one of the columns, namely id , I want to specify the column type as int . The problem is the id series has missing/empty values.
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Check if passed argument is file or directory in Bash
...to add a new answer to an old question when there are equivalent answers already available. If you have some startling new information to add, but all means give an answer. But what you've said has already been said. (test is normally a shell built-in, though there usually is also an executable suc...
What are CN, OU, DC in an LDAP search?
...tory Specification, which defines nodes in a LDAP directory.
You can also read up on LDAP data Interchange Format (LDIF), which is an alternate format.
You read it from right to left, the right-most component is the root of the tree, and the left most component is the node (or leaf) you want to re...
Save modifications in place with awk
...ing output). Therefore, by the time someprocess gets launched and wants to read from the file, there is no data for it to read.
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Is modern C++ becoming more prevalent? [closed]
...yone, but to a large extent, I agree, most people who have a choice have already gone for C# or Java or other such languages.
– jalf
Feb 11 '09 at 18:06
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Why should a function have only one exit-point? [closed]
...d about a single exit-point function as a bad way to code because you lose readability and efficiency. I've never heard anybody argue the other side.
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svn cleanup: sqlite: database disk image is malformed
...natively
You may be able to dump the contents of the database that can be read to a backup file, then slurp it back into an new database file:
sqlite3 .svn/wc.db
sqlite> .mode insert
sqlite> .output dump_all.sql
sqlite> .dump
sqlite> .exit
mv .svn/wc.db .svn/wc-corrupt.db
sqlite3 .sv...
Hash and salt passwords in C#
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I've been reading that hashing functions like SHA256 weren't really intended for use with storing passwords:
https://patrickmn.com/security/storing-passwords-securely/#notpasswordhashes
Instead adaptive key derivation functions like P...
How to erase the file contents of text file in Python?
...n python:
open('file.txt', 'w').close()
Or alternatively, if you have already an opened file:
f = open('file.txt', 'r+')
f.truncate(0) # need '0' when using r+
In C++, you could use something similar.
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What is the meaning of the term “thread-safe”?
Does it mean that two threads can't change the underlying data simultaneously? Or does it mean that the given code segment will run with predictable results when multiple threads are executing that code segment?
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