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Delete specific line number(s) from a text file using sed?
...uite agree with "symptom of an antipattern". Markup-based file types (e.g. XML or JSON) require specific lines at the end in order to be valid files. In that case, it's often the most reasonable approach to remove those lines, put into the file what you want to be added and then re-add those lines, ...
How to check for valid email address? [duplicate]
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import re
if not re.match(r"... regex here ...", email):
# whatever
Python ≥3.4 has re.fullmatch which is preferable to re.match.
Note the r in front of the string; this way, you won't need to escape things twice.
If you have a large number of regexes to check, it might be faster to compi...
Concatenating two lists - difference between '+=' and extend()
I've seen there are actually two (maybe more) ways to concatenate lists in Python:
One way is to use the extend() method:
9...
How to fix “Attempted relative import in non-package” even with __init__.py
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Yes. You're not using it as a package.
python -m pkg.tests.core_test
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Understanding the difference between __getattr__ and __getattribute__
...es which it doesn't explicitly manage and do that via __getattr__ method.
Python will call this method whenever you request an attribute that hasn't already been defined, so you can define what to do with it.
A classic use case:
class A(dict):
def __getattr__(self, name):
return self[...
What are the pros and cons of the leading Java HTML parsers? [closed]
...TML parsers implements the W3C DOM API (part of the JAXP API, Java API for XML processing) and gives you a org.w3c.dom.Document back which is ready for direct use by JAXP API. The major differences are usually to be found in the features of the parser in question. Most parsers are to a certain degre...
How to capture the “virtual keyboard show/hide” event in Android?
.... If this sounds complicated, it's not that really. Here's the code:
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
...
matplotlib does not show my drawings although I call pyplot.show()
...wer is old, config should now be in ~/.config/matplotlib/matplotlibrc (for python 3, at least). I just had a related problem, and I think it was caused by using matplotlib in python 2.7, which created a ~/.matplotlib/ directory, and stopped python 3 from reading the config in ~/.config/matplotlib/. ...
Maven2 property that indicates the parent directory
...roovy code that checks these three folders.
Here is the extract of my pom.xml:
<!-- Use Groovy to search the location of the properties file. -->
<plugin>
<groupId>org.codehaus.groovy.maven</groupId>
<artifactId>gmaven-plugin</artifactId>
<version...
AttributeError(“'str' object has no attribute 'read'”)
In Python I'm getting an error:
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